JP5678923B2 - Storage system, input / output control device, input / output control method, and computer program - Google Patents

Description

  The present invention relates to a technique for processing an input / output request in a storage system including one or more physical storage devices.

  Storage systems equipped with one or more physical storage devices are known. An example of such a storage system is a disk array device on which one or more hard disk drives are mounted. In addition, such a storage system includes an input / output control device that controls input / output of data performed from the host device to the storage device. As such an input / output control device, there is one that improves input / output performance by changing the input / output control operation according to the content of the input / output request from the host device.

  For example, Patent Document 1 describes an input / output control device that changes an input / output control operation depending on whether an input / output request from a host device is sequential access or random access. This input / output control device includes a cache memory having a large cache page size and a cache memory having a small cache page size. When the input / output request is a sequential access, this input / output control device uses a cache memory having a large cache page size and pre-reads surrounding data expected to be accessed in the future together. As a result, in this input / output control device, if there is an access to the previously read data, a cache hit occurs. Therefore, this input / output control device improves cache efficiency. The input / output control device uses a cache memory having a small cache page size when the input / output request is random access. In random access, the probability that the same cache page is accessed before the cache page is rewritten is low. Therefore, this input / output control device improves cache efficiency by reducing the cache page size and increasing the number of cache pages.

  Patent Document 2 describes an input / output control device that changes an input / output control operation when an input / output request from a host device is critical. In Patent Document 2, a critical input / output request refers to an input / output request with a strict response requirement. This input / output control device stores a specific input / output pattern, host information, and control information in association with each other. The specific input / output pattern is a pattern of a sequence of input / output requests in which a critical input / output request is predicted to occur thereafter. The input / output request sequence pattern includes a sequence of types indicating whether each input / output request is a read request or a write request, a time interval of each input / output request, and the like. Further, the control information is on / off information for making the cache resident. When it is determined that the series of input / output request patterns actually received from the host device matches the specific input / output pattern, the input / output control device performs control based on the associated control information.

JP 2000-148487 A JP 2006-221451 A

  In general, one or more host devices are connected to a storage system including an input / output control device as described above. These host devices issue an input / output request having a characteristic for each host device to the storage system in accordance with the application. For example, there is a host device that frequently issues input / output requests with a large data size. There is also a host device that frequently issues input / output requests with a small data size.

  However, although the related art input / output control device described in Patent Document 1 described above changes the cache page size according to whether the type of input / output request is sequential access or random access, the data size and input / output It does not take into account the characteristics of input / output requests that differ for each host device, such as the frequency of requests. Further, the related art input / output control device described in Patent Document 2 described above changes the on / off state of the cache memory resident according to the pattern of the input / output request sequence. It does not consider the characteristics of input / output requests that differ for each host device, such as frequency.

  Therefore, in these related art input / output control devices, in the case of a host device that frequently issues an input / output request with a large data size, data often spans a plurality of cache pages as shown in FIG. In FIG. 9 and each drawing referred to below, a rectangle surrounding the character string “cache page” indicates one cache page, and the size indicates the cache page size. The dot pattern area indicates the data size in one input / output request. Since cache page processing is performed for each cache page, when one input / output request straddles a plurality of cache pages, a delay corresponding to that occurs. Therefore, the input / output control devices of these related techniques often delay input / output processing with respect to such a host device. Furthermore, in the related art input / output control devices, in the case of a host device that frequently issues an input / output request with a small data size, as shown in FIG. 10, cache pages are wasted.

  Further, as shown in FIG. 11, in the case of the host apparatus A that frequently issues an input / output request with a large data size, the line is occupied by the input / output request with a large data size. It will not be issued. In FIG. 11 and each drawing referred to below, a rectangle surrounding the character string “I / O” indicates one input / output request, and represents the data size of the target data by its size. Further, an ellipse surrounding the character string “cue” indicates one cue, and a portion filled with a dot pattern indicates a cue in use. The queue is an area for storing unprocessed input / output requests. Therefore, the number of I / O request queues prepared for such a host apparatus A may be set small. However, in the case of the host apparatus B that frequently issues input / output requests with a small data size, a large number of input / output requests with a small data size are issued. Therefore, it is necessary to set a larger number of I / O request queues prepared for such a host device. However, in the related art input / output control device described above, the number of queues cannot be changed according to the characteristics of input / output requests that differ for each connected host device. Therefore, there is a case where the queue waiting in the host device occurs like the host device B in FIG.

  As described above, the input / output control devices of these related technologies cannot change the input / output control operation according to the characteristics of the input / output request which differs for each host device, and depending on the host device, the input / output performance is sufficient. There was a problem of not.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an input / output control device that improves input / output performance in accordance with characteristics of input / output requests that differ for each host device.

  An input / output control device according to the present invention is an input / output control device provided in a storage system having one or more storage devices, and each host device that issues an input / output request to the storage device includes: A host attribute indicating the characteristics of the input / output request is set, and a host attribute setting unit for setting parameters related to input / output processing in the own device according to the host attribute, and an input issued from the host device to the storage device When an output request is received, an input / output processing unit that executes input / output processing according to the input / output request, an input / output request monitoring unit that monitors the input / output request for each host device, and the input / output request monitoring unit For each host device, the new host attribute of the host device is determined for each host device, and the determined new host attribute is notified to the host attribute setting unit. Comprising a list attribute discrimination unit.

  The storage system of the present invention includes the input / output control device and one or more storage devices.

  The input / output control method according to the present invention sets, for each host device that issues an input / output request for one or more storage devices, a host attribute indicating the characteristics of the input / output request of the host device, Set parameters related to input / output processing according to the host attribute, monitor the input / output request issued from the host device to the storage device, and for each host device based on the monitoring result of the input / output request The new host attribute of the host device is determined, and the host attribute and the parameter are changed for each host device using the determined new host attribute.

  In addition, the computer program of the present invention sets a host attribute indicating the characteristics of an input / output request of the host device for each host device that issues an input / output request for one or more storage devices, A host attribute setting step for setting parameters related to output processing according to the host attribute, an input / output request monitoring step for monitoring an input / output request issued from the host device to the storage device, and the input / output request monitoring step The host attribute determination step for determining a new host attribute of the host device for each of the host devices based on the monitoring result at the host device, and the new host attribute determined in the host attribute determination step, A host attribute changing step for changing the host attribute and the parameter for each device; To row.

  The present invention can provide an input / output control device that improves input / output performance according to the characteristics of input / output requests that differ from host device to host device.

1 is a block diagram showing a configuration of a storage system as a first embodiment of the present invention. FIG. It is a flowchart explaining operation | movement of the input-output control apparatus as the 1st Embodiment of this invention. It is a schematic diagram explaining the effect of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the storage system as the 2nd Embodiment of this invention. It is a figure explaining an example of the number of queues set for every host device in a 2nd embodiment of the present invention. It is a figure explaining an example of the process which discriminate | determines a new host apparatus in the 2nd Embodiment of this invention. It is a flowchart explaining operation | movement of the input / output control apparatus as the 2nd Embodiment of this invention. It is a flowchart explaining the setting operation | movement of the queue number of the input / output control apparatus as the 2nd Embodiment of this invention. It is a schematic diagram explaining the cache page straddle in related technology. It is a schematic diagram explaining the wasteful use of the cache page in related technology. It is a schematic diagram explaining the problem of the queue allocation in related technology.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 shows the configuration of the storage system 1 as the first embodiment of the present invention. In FIG. 1, the storage system 1 includes an input / output control device 10 and one or more storage devices 80. The storage device 80 is configured by, for example, a hard disk drive. In addition, the storage device 80 may be configured as a RAID (Redundant Array of Inexpensive Disks) system that distributes and stores data in one or more storage devices 80.

  The input / output control device 10 is connected to the host device 90 and processes an input / output request from the host device 90 to the storage device 80. 1 shows four storage devices 80 and three host devices 90, the number of storage devices included in the storage system of the present invention and the number of host devices connected to the storage system of the present invention are shown. It is not limited.

  The input / output control device 10 includes a host attribute setting unit 11, an input / output processing unit 12, an input / output request monitoring unit 13, and a host attribute determination unit 14. Here, the input / output control device 10 includes a processor, a memory, a cache memory, a host device connection interface, and a storage device connection interface.

  The memory stores a computer program and various data for causing the computer device to function as the input / output control device 10 of the present embodiment. The memory also includes a queue that is an area for sequentially storing input / output requests waiting for input / output processing among the input / output requests received from the host device 90.

  The processor controls each unit of the input / output control device 10 by reading and executing the computer program and various data stored in the memory.

  The cache memory temporarily stores data transferred between the host device 90 and the storage device 80. The cache memory is managed by being divided into units called cache pages.

  The host device connection interface connects to the host device 90 and transmits / receives data.

  The storage device connection interface is connected to the storage device 80 to transmit and receive data.

  The host attribute setting unit 11, the input / output request monitoring unit 13, and the host attribute determination unit 14 are configured by a processor that reads and executes a computer program and various data stored in a memory. The input / output processing unit 12 includes a host device connection interface, a storage device connection interface, a cache memory, and a processor that reads and executes computer programs and various data stored in the memory. Note that the hardware configuration of the input / output control device 10 and each functional block thereof is not limited to the above-described configuration.

  The host attribute setting unit 11 sets a host attribute and a parameter corresponding to the host attribute for each host device 90. Here, the host attribute is an attribute that represents the characteristics of the input / output request of each host device 90. The parameters are various parameters related to input / output processing of the storage system 1.

  For example, as a host attribute, there is an attribute value “throughput priority” indicating that throughput is given priority in input / output requests in order to frequently issue input / output requests having a data size larger than the cache page size. May be. Another host attribute is “IOPS” indicating that IOPS (Input Output Per Second) is given priority in input / output requests in order to frequently issue input / output requests having a data size smaller than the cache page size. An attribute value “priority” may be prepared.

  Further, the host attribute setting unit 11 may set a host attribute for each connected host device 90 based on information stored in advance in a memory. Alternatively, the host attribute setting unit 11 provides the host device 90 or a management terminal (not shown) with an attribute setting user interface for setting a host attribute for each host device 90 to be connected. A host attribute may be set every 90. Specifically, the host attribute setting unit 11 may receive information input using the attribute setting user interface in the host device 90 or the management terminal, and set the host attribute based on the received information.

  Further, the host attribute setting unit 11 sets a parameter corresponding to the host attribute based on the host attribute set for each host device 90. The parameter may be, for example, a cache page size. Further, the parameter may be a parameter related to the number of queues allocated to each host device 90, for example. In addition, the parameter may be an arbitrary parameter related to input / output processing of the storage system 1. The parameter corresponding to the host attribute may be predetermined for the host attribute. For example, a larger cache page size and a smaller queue number than the other host attributes are predetermined for the host attribute “throughput priority” described above, and other for the host attribute “IOPS priority”. A cache page size smaller than the host attribute and a larger queue number may be determined in advance.

  When the host attribute setting unit 11 is notified of a new host attribute of each host device 90 from the host attribute determination unit 14 described later, the host attribute and parameter of each host device 90 are based on the notified host attribute. Set. At this time, the host attribute setting unit 11 may use a predetermined parameter for the new host attribute.

  When the input / output processing unit 12 receives an input / output request from the host device 90, the input / output processing unit 12 executes an input / output process corresponding to the input / output request. For example, the input / output processing unit 12 performs input / output processing using the above-described queue and cache memory. In this case, the input / output processing unit 12 stores the input / output request received from the host device 90 in a queue assigned to the host device 90. The input / output processing unit 12 sequentially processes the input / output requests stored in the queues of the respective host devices 90. When the parameter set by the host attribute setting unit 11 includes a parameter related to a queue, the input / output processing unit 12 determines whether the input / output request is received based on the set parameter regarding the number of queues. Accordingly, a queue is assigned to each host device 90.

  If the input / output request to be processed is a write-type data transfer, the input / output processing unit 12 temporarily stores the data transferred from the host device 90 in the cache memory and then stores it at a predetermined timing. Write to device 80. If the input / output request to be processed is a read data transfer, the input / output processing unit 12 reads the data from the cache memory if the read target data exists in the cache memory. If the data to be read does not exist in the cache memory, the input / output processing unit 12 reads the data from the storage device 80 and stores it in the cache memory and transfers it to the host device 90. In addition, if the input / output request to be processed is a sequential Read command, the input / output processing unit 12 reads the data that is supposed to be requested by the next Read command from the storage device 80 to the cache memory in advance. Processing may be performed.

  Here, the cache memory is divided into units called cache pages, and is associated with the physical area of the storage device 80 in units of cache pages. When the data is temporarily stored in the cache memory, the input / output processing unit 12 determines which cache page of the cache memory the data is allocated to by determining which cache page is in use and which is not used.

  The input / output request monitoring unit 13 monitors input / output requests received for each host device 90. For example, the input / output request monitoring unit 13 may monitor information on the data size in the input / output request for each host device 90. For example, as shown in FIG. 9, when the data size is larger than the cache page size, the data is stored across a plurality of cache pages. This is also referred to as straddling the cache page. Therefore, the input / output request monitoring unit 13 may monitor the occurrence ratio of cache page straddling in a predetermined period for each host device 90. Specifically, the input / output request monitoring unit 13 measures the data size of the input / output request received from the host device 90 in a predetermined period, thereby determining the number of occurrences S of cache page straddles and the input / output in the predetermined period. The total number L of requests may be obtained. As a result, the input / output request monitoring unit 13 can calculate the occurrence ratio S / L of the cache page straddling in a predetermined period for each host device 90.

  Also, different input / output request data is not stored in the same cache page. Therefore, as shown in FIG. 10, when the data size is smaller than the cache page size, the cache page is wasted. Therefore, the input / output request monitoring unit 13 may monitor the occurrence rate of cache page waste during a predetermined period for each host device 90. Specifically, the input / output request monitoring unit 13 measures the data size of the input / output request received from the host device 90 during a predetermined period, so that the data size is equal to or less than a predetermined ratio of the cache page size (for example, half And the total number L of input / output requests in a predetermined period may be obtained. As a result, the input / output request monitoring unit 13 can calculate the occurrence ratio N / L of cache page waste for each host device 90.

  Further, the input / output request monitoring unit 13 may monitor the IOPS for each host device 90. For example, the I / O request monitoring unit 13 may calculate the ratio P (= IOPS actual measurement value / γ) of the actual measurement value to the IOPS default value γ by measuring the IOPS for a certain period for a certain host device 90. .

  Further, the input / output request monitoring unit 13 may monitor various information representing other characteristics of the input / output request, not limited to information relating to the data size and IOPS. Further, the input / output request monitoring unit 13 may monitor a plurality of pieces of information without being limited to one piece of information.

  The input / output request monitoring unit 13 is specific to each host device 90 such as a WWN (World Wide Name), for example, which host device 90 has issued the input / output request to be monitored. It is possible to discriminate using the identifier.

  The host attribute determination unit 14 determines a new host attribute of each host device 90 based on the monitoring result by the input / output request monitoring unit 13 and notifies the determined new host attribute to the host attribute setting unit 11. For example, the host attribute determination unit 14 may determine a new host attribute for each host device 90 based on information on the data size in a predetermined period. Specifically, the host attribute determination unit 14 may determine a new host attribute based on the occurrence ratio of cache page straddling in a predetermined period. In this case, the host device 90 frequently issues an input / output request for data having a larger size than the cache page size as the occurrence rate of cache page straddles increases (for example, the value of the occurrence rate is larger than the threshold). I understand. Therefore, the host attribute determination unit 14 may determine that such a new host attribute of the host device 90 is the aforementioned “throughput priority”.

  Further, for example, the host attribute determination unit 14 may determine a new host attribute based on the occurrence rate of cache page waste during a predetermined period. In this case, the host device 90 frequently issues an input / output request for data having a smaller size with respect to the cache page size as the occurrence rate of cache page waste is higher (for example, the value of the occurrence rate is larger than the threshold). I understand. Therefore, the host attribute determination unit 14 may determine that the new host attribute of the host device 90 is the above-mentioned “IOPS priority”.

  Further, for example, the host attribute determination unit 14 may determine a new host attribute based on the measured IOPS value in a predetermined period. Specifically, the host attribute determination unit 14 may determine a new host attribute using the ratio P of the actual measurement value to the IOPS default value γ described above. In this case, it can be seen that the host device 90 frequently issues input / output requests for data having a smaller size than the cache page size as P is larger (for example, P is larger than the threshold). Therefore, the host attribute determination unit 14 may determine that the new host attribute of the host device 90 is the above-mentioned “IOPS priority”. Further, it can be seen that the smaller the P is (for example, P is less than or equal to the threshold), the host device 90 frequently issues input / output requests for data having a size larger than the cache page size. Therefore, the host attribute determination unit 14 may determine that the new host attribute of the host device 90 is the above-mentioned “throughput priority”.

  Further, the host attribute determination unit 14 determines a new host attribute based on the monitoring result of various information indicating other characteristics of the input / output request, not limited to the monitoring result of the information regarding the data size and the IOPS. Also good. Further, the host attribute determination unit 14 may determine a new host attribute based not only on the monitoring result of one type of information but also on the combination of the monitoring results of a plurality of information.

  Then, the host attribute determination unit 14 notifies the host attribute setting unit 11 of the new host attribute of each host device 90 determined as described above.

  The operation of the input / output control apparatus 10 in the storage system 1 configured as described above will be described with reference to FIG. In FIG. 2, it is assumed that the input / output processing unit 12 sequentially processes the input / output requests while receiving the input / output requests from the respective host devices 90.

  First, the host attribute setting unit 11 sets a host attribute for each host device 90 (step S1). For example, as described above, the host attribute setting unit 11 may set host attributes using information stored in the memory in advance for each host device 90, or may use host information to input host attributes. May be set.

  Next, the host attribute setting unit 11 sets parameters related to the input / output processing according to the input / output request from each host device 90 based on the host attribute set in step S1 (step S2). For example, as described above, the host attribute setting unit 11 may set a predetermined cache page size and the number of queues for the host attribute set in step S1.

  As a result, the input / output processing unit 12 performs input / output processing using the cache page size and the number of queues set in each host device 90.

  Next, the input / output request monitoring unit 13 starts monitoring input / output requests for each host device 90 (step S3).

  Next, the input / output request monitoring unit 13 monitors the input / output request received from each host device 90 for each host device 90 (step S4). For example, the input / output request monitoring unit 13 may measure the data size or IOPS of the input / output request for each host device 90.

  Next, the input / output request monitoring unit 13 determines whether or not a predetermined period has elapsed since the monitoring was started in step S3 (step S5).

  If it is determined that the predetermined period has not elapsed, the input / output request monitoring unit 13 continues the monitoring process in step S4.

  On the other hand, when determining that the predetermined period has elapsed, the input / output request monitoring unit 13 determines a new host attribute of each host device 90 based on the monitoring result of step S4 in the predetermined period (step S6).

  For example, as described above, the input / output request monitoring unit 13 determines that the cache page straddle occurrence ratio S / L and the cache page waste count N / L based on the information acquired in step S4 during a predetermined period. The ratio P or the like of the actually measured value with respect to the IOPS default value γ may be calculated. Then, for example, the host attribute determination unit 14 may determine that the new host attribute of the host device 90 is “throughput priority” if the occurrence ratio S / L across the cache pages is equal to or greater than the threshold. For example, as described above, the host attribute determination unit 14 determines that the new host attribute of the host device 90 is “IOPS priority” if the occurrence ratio N / L of the cache page wastefulness is equal to or greater than the threshold. May be. In addition, for example, the host attribute determination unit 14 may determine a new host attribute of the host device 90 based on whether or not the ratio P of the actual measurement value with respect to the IOPS default value γ is equal to or greater than a threshold value.

  Next, the host attribute determination unit 14 notifies the host attribute setting unit 11 of the new host attribute of each host device 90 determined in step S6 (step S7). In this step, the host attribute determining unit 14 does not notify the host attribute setting unit 11 of the host device 90 whose new host attribute determined in step S6 is the same as the current host attribute. Also good.

  Accordingly, the host attribute setting unit 11 can set a new host attribute and a new parameter in each host device 90 using the notified new host attribute. For example, the host attribute setting unit 11 can set a new parameter for each host device 90 by using a predetermined parameter for the new host attribute notified from the host attribute determination unit 14. In this case, for example, as described above, the host attribute determination unit 14 may set the cache page size and the number of queues associated with the new host attribute in advance.

  Above, description of operation | movement of the input / output control apparatus 10 is complete | finished.

  Next, effects of the first exemplary embodiment of the present invention will be described.

  The storage system and the input / output control device according to the first embodiment of the present invention can further improve the input / output performance according to the characteristics of the input / output request that differs for each host device.

  This is because the host attribute setting unit sets a host attribute for each host device, and sets parameters related to input / output processing according to the host attribute. Further, the input / output request monitoring unit monitors the input / output request for each host device, and the host attribute determination unit determines an appropriate host attribute based on the monitoring result of the input / output request for each host device, and This is because the host attribute is notified to the host attribute setting unit.

  As a result, the first embodiment of the present invention not only makes it possible to set parameters related to input / output processing for each host device, but also changes the characteristics of input / output requests from the host device. If the set host attributes are not appropriate, more appropriate host attributes and parameters can be set. Therefore, in the first embodiment of the present invention, the input / output processing is performed with an appropriate parameter based on an appropriate host attribute set for each host device, and the input / output performance is further improved.

  For example, when the input / output request monitoring unit monitors the occurrence ratio of the cache page straddling, and the host attribute determining unit notifies the host attribute setting unit of the new host attribute determined based on the occurrence ratio of the cache page straddling, In the present embodiment, as shown in FIG. 3, a more appropriate cache page size can be applied by setting a more appropriate host attribute for the host apparatus A having a high occurrence ratio of cache page straddling. it can. Note that “port”, “queue”, and “cache page” in FIG. 3 constitute part of the input / output control unit of the present embodiment. As described above, the present embodiment reduces the cache page straddle in such an input / output request from the host apparatus A. The occurrence of cache page straddling has been a cause of delaying input / output processing because input / output processing is performed for each cache page. Therefore, the present embodiment reduces input / output processing delay due to cache page straddling and improves input / output performance.

  Further, for example, the input / output request monitoring unit monitors the occurrence rate of cache page waste, and the host attribute determination unit notifies the host attribute setting unit of the new host attribute determined based on the occurrence rate of cache page waste. In this case, as shown in FIG. 3, in the present embodiment, a more appropriate cache page size is applied by setting a more appropriate host attribute for the host apparatus B having a high occurrence rate of cache page waste. be able to. Therefore, this embodiment reduces the wasteful use of cache pages in such input / output requests from the host apparatus B, and more input / output requests can be allocated to the cache memory as a whole. Here, it is faster to perform read / write on the cache memory than to directly read / write to the storage device. Therefore, this embodiment improves the overall input / output performance by allocating more input / output requests to the cache memory.

  In addition, the storage system and the input / output control apparatus according to the first embodiment of the present invention can cope with a high-load input / output request according to the characteristics of the input / output request that differs for each host device.

The reason is that the input / output request monitoring unit monitors the IOPS, and the host attribute determining unit notifies the host attribute setting unit of the new host attribute determined based on the IOPS monitoring result. Thereby, as shown in FIG. 3, this embodiment can apply a more appropriate number of queues by setting a more appropriate host attribute to each host device. As a result, this embodiment makes it possible to allocate more queues to host devices that frequently issue I / O requests with a small data size, and high load I / O requests from such host devices. Can also be supported.
(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to the drawings. Note that, in each drawing referred to in the description of the present embodiment, the same reference numerals are given to the same configuration and steps that operate in the same manner as in the first embodiment of the present invention, and the detailed description in the present embodiment. Description is omitted.

  FIG. 4 shows the configuration of the storage system 2 as the second embodiment of the present invention. In FIG. 4, the storage system 2 differs from the storage system 1 according to the first embodiment of the present invention in that an input / output control device 20 is provided instead of the input / output control device 10. Further, the input / output control device 20 is different from the input / output control device 10 according to the first embodiment of the present invention in that the host attribute setting unit 21 and the host attribute determination unit 14 are replaced with the host attribute setting unit 11. Instead, a host attribute determination unit 24 is provided, and a parameter calculation unit 25 and a recommended setting presentation unit 26 are provided. Here, the recommended setting presentation unit 26 includes a host device connection interface and a processor that reads and executes computer programs and various data stored in the memory. The parameter calculation unit 25 includes a processor that reads and executes computer programs and various data stored in the memory. The parameter calculation unit 25 constitutes a part of an embodiment of the host attribute determination unit of the present invention. The recommended setting presentation unit 26 constitutes a part of an embodiment of the host attribute setting unit of the present invention. Note that the hardware configuration of the input / output control device 20 and each functional block thereof is not limited to the above-described configuration.

  Further, the input / output control device 20 is connected to the storage device 80 and the host device 90 and is issued by the host device 90 in the same manner as the input / output control device 10 according to the first embodiment of the present invention. Process I / O requests for.

  The host attribute setting unit 21 sets a host attribute representing the characteristics of the input / output request of each host device 90 for each host device 90. Here, in the present embodiment, the host attribute is divided into two or more stages from the first host attribute to the second host attribute according to the degree to which the input / output request by the host device 90 exhibits arbitrary characteristics. Host attributes are prepared in advance. Here, for example, when an arbitrary characteristic is a characteristic that “throughput is given priority in order to frequently issue an input / output request having a large data size”, the first host attribute having the largest degree of indicating this characteristic. “Throughput priority” is provided. Further, the smallest degree indicating this characteristic can be regarded as “IOPS is given priority in order to frequently issue input / output requests with a small data size”. Therefore, in this case, “IOPS priority” is provided as the second host attribute having the smallest degree of exhibiting this characteristic. From “throughput priority” to “IOPS priority”, two or more levels of host attributes are set according to the degree of this characteristic. In the present embodiment, the following description will be given on the assumption that “default” is provided between “throughput priority” and “IOPS priority”, so that three levels of host attributes are prepared.

  Furthermore, in this embodiment, in addition to the above-described three-level host attributes, host attributes “custom” and “auto” are prepared. “Custom” indicates that the parameters of the host device 90 are set based on input information from the outside. “Auto” indicates that the parameter of the host device 90 can be appropriately changed without using input information from the outside.

  The host attribute setting unit 21 sets any of the host attributes described above for each host device 90 based on input information from the outside. For example, the host attribute setting unit 21 provides a host attribute setting user interface to the host device 90 or a management terminal (not shown), so that the host attribute is set based on information input from the host device 90 or the management terminal. May be set.

  In addition, the host attribute setting unit 21 sets parameters to be applied to input / output processing of each host device 90 according to the host attribute set for each host device 90. In the present embodiment, the host attribute setting unit 21 sets parameters relating to the cache page size and the number of queues as parameters.

  For example, when the host attribute is set to other than “custom”, the host attribute setting unit 21 sets a predetermined cache page size for each host attribute. In addition, when the host attribute is set to “custom”, the host attribute setting unit 21 sets the cache page size using information input from the outside as the cache page size.

  For example, the host attribute setting unit 21 may set the minimum number M of queues and the upper limit number Y assigned to each host device 90 as parameters regarding the number of queues.

  Here, the minimum number M of queues is the number of queues secured for each host device 90 even when the storage system 2 is under heavy load. The minimum number M of such queues may be determined in advance according to each host attribute. The host attribute setting unit 21 sets the queues for each host device 90 so that the total value of the minimum number M of all the host devices 90 does not exceed the total number of queues included in the input / output control device 20. The minimum number M is set. If the total value of the minimum number M of each host device 90 exceeds the total number of queues, the host attribute setting unit 21 presents a user interface that prompts the host attribute or the minimum number M to be changed. Also good.

The queue upper limit number Y is the upper limit number of queues that can be assigned to the host device 90 when an input / output request from the host device 90 becomes a heavy load. The host attribute setting unit 21 may calculate the upper limit number Y for each host device 90 using the following equation (1).
Y = Xβ / N + M (1)
Here, X is the number of queues that can be used in the input / output control device 20. The usable queue number X is obtained by subtracting the total value of the minimum number M of each host device 90 from the total queue number. Β is a predetermined coefficient predetermined for each host attribute. N is the number of connected host devices 90. M is the minimum number of queues described above.

  An example of the parameters related to the number of queues set by the host attribute setting unit 21 is shown in FIG. FIG. 5 shows the minimum number M and the upper limit number Y of queues set in the host apparatus 90 of each host attribute using the above-described equation (1). In FIG. 5, the upper limit number of queues being ∞ (infinite) means that no upper limit is set for the number of queues assigned to the host device 90. For example, when an input / output request from the host device 90 in which the upper limit number of queues is set to ∞ is a heavy load, even if the number of queues allocated to other host devices 90 is close to the minimum queue number M, This shows that a queue is preferentially assigned to the host device 90.

  As a result, each host device 90 is assigned a queue from M to Y using the minimum number M and the upper limit number Y set by the host attribute setting unit 21. The queue assignment based on the minimum number M and the upper limit number Y is controlled by, for example, the input / output processing unit 12.

  Further, for example, for the host device 90 whose host attribute is set to “custom”, the host attribute setting unit 21 sets these parameters using information input from the outside as parameters relating to the number of queues. That's fine. In this case, the host attribute setting unit 21 receives the information indicating the minimum number M of queues and the predetermined coefficient β from the outside for each host device 90, and uses the above equation (1) to set the upper limit number. Y may be calculated.

  Further, the host attribute setting unit 21 presents new host attributes and new parameters of each host device 90 notified from the host attribute determination unit 24 described later using the recommended setting presentation unit 26. For example, the recommended setting presentation unit 26 may display information on the transmission destination apparatus by transmitting information including new host attributes and new parameters to the host apparatus 90 or the management terminal. . Specifically, the recommended setting presentation unit 26 may include these new host attributes and new parameters in the above-described attribute setting user interface and provide them to the host device 90 or the management terminal. That is, the recommended setting presentation unit 26 assists the user to set a new host attribute in the host device 90. Alternatively, the recommended setting presentation unit 26 assists the user to cause the host device 90 to set a new parameter as a parameter in the host attribute “custom”. Thereby, the host attribute setting unit 21 can set a new host attribute and a new parameter in each host device 90 using information input from the outside in accordance with the presentation of the recommended setting presentation unit 26.

  However, the host attribute setting unit 21 does not present the host device 90 whose host attribute is set to “auto”, and the parameters applied to the input / output processing of the host device 90 without presenting the recommended setting presenting unit 26. May be changed. In this case, the host attribute determination unit 24 may set a new parameter notified from the host attribute determination unit 24 described later as a parameter applied to the input / output processing of the host device 90.

  The host attribute determination unit 24 includes a parameter calculation unit 25 that calculates a new parameter based on the monitoring result of the input / output request monitoring unit 13 for each host device 90.

  For example, the parameter calculation unit 25 may calculate the cache page size as a new parameter based on the monitoring result regarding the data size. At this time, for example, the parameter calculation unit 25 calculates, as a new cache page size, a value obtained by adding a predetermined margin to the average value of the actual measurement values of the data size in the predetermined period obtained by the input / output request monitoring unit 13. May be.

For example, the parameter calculation unit 25 may calculate the minimum number M ′ and the upper limit number Y ′ of the queue as new parameters based on the monitoring result of the IOPS. For example, if the ratio P of the actual measurement value to the IOPS default value γ is less than 1, the parameter calculation unit 25 sets the minimum number M ′ of new queues and the new upper limit number Y ′ to the minimum number until then. It calculates so that it may become smaller than M and the upper limit number Y. If the ratio P of the actual measurement value to the IOPS default value γ is 1 or more, the parameter calculation unit 25 sets the new queue minimum number M ′ and the new upper limit number Y ′ to the minimum number up to that point. It calculates so that it may become larger than M and the upper limit number Y. In order to calculate the minimum number M ′ and the new upper limit number Y ′ of such new queues, for example, the parameter calculation unit 25 may use the following expressions (2) and (3).
M ′ = P × M0 (2)
Y ′ = X × P / N + M ′ (3)
Here, M0 represents the minimum number M of queues set in the host device 90 at that time. Further, P is a value obtained by P = IOPS actual measurement value / γ, and is a ratio of the actual measurement value to the IOPS default value γ as described above. The IOPS default value γ may be a value determined in advance in the storage system 2. Alternatively, the default value γ of IOPS may be an average value of IOPS actual measurement values of each host device 90 or the like.

  Further, the host attribute determining unit 24 determines a new host attribute for each host device 90 based on the monitoring result by the input / output request monitoring unit 13. Specifically, the host attribute discriminating unit 24 determines how many steps the host attribute of each host device 90 is changed in the direction of “throughput priority” or “IOPS priority”. Then, the host attribute determination unit 24 determines, as new host attributes, the host attributes that have been changed in the host device 90 by the number of stages determined in the determined direction. Note that the host attribute determination unit 24 does not need to determine a new host attribute for the host device 90 in which the host attribute is set to “custom” or “auto”.

  For example, the host attribute determination unit 24 may determine the direction in which the host attribute is changed and the number of steps to be changed as follows based on the monitoring result related to the data size or IOPS. Specifically, the host attribute determination unit 24 is set to the host device 90 if the occurrence rate S / L of the cache page straddle for each host device 90 is large (for example, the value of the occurrence rate is larger than the threshold value). It may be decided to change the host attribute closer to “throughput priority”. Further, the host attribute determination unit 24, if the occurrence rate N / L of the cache page wastefulness relating to each host device 90 is large (for example, if the value of the occurrence rate is larger than the threshold), the host set in the host device 90 It may be determined that the attribute is changed closer to “IOPS priority”. At this time, the host attribute discriminating unit 24 determines how many steps to change in the corresponding direction according to the value of the occurrence ratio S / L of the cache page straddling or the occurrence ratio N / L of the cache page wasteful use. That's fine.

  In addition, the host attribute determination unit 24, when both of the occurrence ratio S / L of the cache page straddle and the occurrence ratio N / L of the wasteful use of the cache page are low (for example, below the respective threshold values) The current host attribute may be used as a new host attribute as it is.

  Further, if the ratio P of actual measurement values to the IOPS default value for each host device 90 is large (for example, if P is larger than the threshold value), the host attribute determination unit 24 displays the host attribute set for the host device 90. You may decide to change to "IOPS priority." In addition, the host attribute determination unit 24 determines that the host attribute set in the host device 90 is changed closer to “throughput priority” if the above-described P is small (for example, if P is equal to or less than the threshold). Also good. At this time, the host attribute determination unit 24 may determine how many steps to change in the corresponding direction according to the value of P.

  In addition, the host attribute determination unit 24 determines the host attribute changing direction and the number of steps to be changed based on a combination of monitoring results related to a plurality of information such as the monitoring result related to the data size and the monitoring result related to IOPS. Also good.

  An example of a new host attribute determination condition based on a combination of monitoring results regarding a plurality of pieces of information is shown in FIG. In FIG. 6, for example, the host attribute determination unit 24 sets “1” for the host device 90 that satisfies S / L ≧ 0.5, N / L <0.5, and 0.5 ≦ P <0.8. The determination result “approaching stepped throughput” is applied. Here, as described above, as host attributes, except for “custom” and “auto”, three levels of host attributes are prepared in the order of “IOPS priority”, “default”, and “throughput priority”. Therefore, if the host attribute of the host device 90 is “IOPS priority” at that time, the determination result “toward one-stage throughput” is changed from “IOPS priority” to “to one-stage throughput”. "Represents a new host attribute. In addition, the determination result “toward two-stage throughput” is changed from “IOPS priority” to “to two-stage throughput” if the host attribute of the host device 90 at that time is “IOPS priority”. This indicates that “throughput priority” is determined as a new host attribute.

  The operation of the storage system 2 configured as described above will be described with reference to FIG. In FIG. 7, it is assumed that the input / output processing unit 12 sequentially processes the input / output requests while receiving the input / output requests from the respective host devices 90.

  First, the host attribute setting unit 21 sets a host attribute for each host device 90 in accordance with an external input (step S11). Here, it is assumed that one of the host attributes “custom”, “auto”, “throughput priority”, “default”, and “IOPS priority” is set.

  For example, as described above, the host attribute setting unit 21 uses the host device 90 or the attribute input user interface provided to the management terminal to input the host attribute of each host device 90 using information input by the device. Should be set.

  Next, the host attribute setting unit 21 sets a cache page size to be applied in the input / output request processing of each host device 90 based on the host attribute set in step S11 for each host device 90 (step S12). .

  For example, as described above, if the host attribute set in step S11 is other than “custom”, the host attribute setting unit 21 may set a predetermined cache page size for the host attribute. . Further, if the host attribute set in step S11 is “custom”, the host attribute setting unit 21 may set the value input by the host device 90 or the management terminal as the cache page size. Also, for example, when the host attribute set in step S11 is “auto”, the cache page defined for the host attribute (for example, “default”) defined to be applied first when “auto” is selected. You may set the size.

  Next, the host attribute setting unit 21 sets a parameter relating to the queue used in the processing of the input / output request of each host device 90 based on the host attribute set in step S11 for each host device 90 (step S13). Details and specific examples of this step will be described later.

  Thereafter, the input / output processing unit 12 processes the input / output request from each host apparatus 90 using the cache page size and queue-related parameters set in step S12 and step S13.

  Next, the input / output request monitoring unit 13 starts monitoring input / output requests for each host device 90 (step S14).

  Next, the input / output request monitoring unit 13 measures the IOPS from each host device 90 (step S15).

  Next, the input / output request monitoring unit 13 measures the data size of the input / output request from each host device 90 (step S16).

  Next, the input / output request monitoring unit 13 determines whether or not a predetermined period has elapsed since the start of monitoring in step S14 (step S17).

  Here, when the predetermined period has not elapsed, the input / output request monitoring unit 13 continues the monitoring process of steps S15 to S16.

  On the other hand, when the predetermined period has elapsed, the parameter calculation unit 25 calculates the number of queues as new parameters appropriate for each host device 90 based on the monitoring result of the IOPS in step S15 (step S18).

  For example, as described above, the parameter calculation unit 25 uses the above-described equations (2) and (3) for each host device 90, using the ratio P of the actual measurement value in step S15 with respect to the IOPS default value γ. Thus, a new minimum queue number M ′ and a new upper limit number Y ′ may be calculated. A specific example of this step will be described later.

  Next, the parameter calculation unit 25 calculates a cache page size as a new parameter appropriate for each host device 90 based on the data size monitoring result in step S16 (step S19).

  For example, as described above, the parameter calculation unit 25 sets, for each host device 90, a value obtained by adding a predetermined margin to the average value of the actually measured data size measured in step S16 in a predetermined period, as a new cache page. It may be calculated as a size.

  Next, the host attribute determining unit 24 determines a new host attribute appropriate for each host device 90 based on the monitoring results of steps S15 to S16 (step S20).

  For example, as described above, the host attribute determination unit 24 measures, for each host device 90, the cache page straddle occurrence ratio S / L, the cache page waste occurrence ratio N / L, and the IOPS default value γ for a predetermined period. Even if a new host attribute is discriminated by determining in which direction the level of the host attribute set at this time is to be changed based on the ratio P of values, or a combination thereof, etc. Good.

  Then, the host attribute determination unit 24 notifies the host attribute setting unit 21 of the new host attribute determined in step S20 and the new parameter calculated in steps S18 to S19 for each host device 90.

  Next, the host attribute setting unit 21 determines whether or not the host attribute set in each host device 90 is “auto” (step S21).

Here, for each host device 90 that is determined to be set to something other than “auto”, the host attribute setting unit 21 determines whether or not the currently set host attribute and the new host attribute are the same. Judgment (step S22)
Here, for each host device 90 for which the current host attribute and the new host attribute are determined to be the same, the input / output control device 20 returns to step S14 and continues the input / output processing while Continue monitoring.

  On the other hand, for each host device 90 that has determined that the current host attribute is not the same as the new host attribute, the recommended setting presentation unit 26 presents a new host attribute and a new parameter for each corresponding host device 90. (Step S23).

  For example, as described above, the recommended setting presenting unit 26 transmits information including new host attributes and new parameters to the attribute setting user interface provided to the host device 90 or the management terminal. Thus, these pieces of information may be displayed on the host device 90 or the management terminal.

  Then, the input / output control device 20 returns to step S14 and continues monitoring the input / output request while continuing the input / output processing.

  After this, it is conceivable that a host attribute or parameter is input in the host device 90 or the management terminal in accordance with the presentation process in step S23. In that case, the input / output control device 20 executes the operation from step S11.

  On the other hand, for each host device 90 that is determined to be set to “auto” in step S21, the host attribute setting unit 21 uses the new parameters calculated in steps S18 to S19 to execute the cache page size and the queue. The number setting is changed (step S24). At this time, the host attribute setting unit 21 may present information indicating that the cache page size and the number of queues have been changed using the recommended setting presenting unit 26.

  Then, the input / output control device 20 returns to step S14 and continues monitoring the input / output request while continuing the input / output processing.

  Next, details of the parameter setting operation relating to the queue in step S13 will be described with reference to FIG.

  Here, first, the host attribute setting unit 21 determines the minimum number M of queues of each host device 90 (step S31). For example, the host attribute setting unit 21 applies the minimum number M of queues determined in advance to each host attribute for each host device 90 whose host attribute set in step S11 is other than “custom”. Good. Further, the host attribute setting unit 21 sets the value input as the minimum number M of queues for each host device 90 whose host attribute set in step S11 is “custom”. do it.

  Next, the host attribute setting unit 21 can be used by subtracting the total of the minimum number M of queues set for each host device 90 from the total number of queues provided in the input / output control device 20. The queue number X is determined (step S32).

  Next, the host attribute setting unit 21 determines whether or not the number of queues currently used in the input / output control device 20 exceeds the threshold value α (step S33).

  If it is determined that the threshold value α is not exceeded, the host attribute setting unit 21 continues the input / output process for a predetermined period (step S35), and then executes the determination process of step S33 again.

  On the other hand, if it is determined that the threshold value α is exceeded, the host attribute setting unit 21 sets the upper limit number Y of queues that can be used for each host device 90 (step S34). At this time, the input / output control device 20 uses the minimum number M of queues set in step S31 and the predetermined coefficient β, and the upper limit number Y of each host device 90 using the above equation (1). May be calculated. In this case, for host attributes other than “custom”, the predetermined coefficient β is determined in advance in association with each host attribute. In the case of the host attribute “custom”, the host attribute setting unit 21 uses the value of the predetermined coefficient β input together with the information indicating “custom” in step S11 to calculate the upper limit number Y based on the equation (1). It may be set. Alternatively, when the host attribute is “custom” and the value of the upper limit number Y of the queue is already input together with the information indicating “custom” in step S11, the host attribute setting unit 21 receives the input upper limit number Y. Should be set. When the host attribute is “auto”, the host attribute setting unit 21 may set the upper limit number Y using the new parameter notified from the host attribute determination unit 24. When the host attribute is “auto” and no new parameter notification is yet received from the host attribute determination unit 24, the host attribute setting unit 21 sets the minimum queue for the “default”, for example. The upper limit number Y may be set using the number M and a predetermined coefficient β.

  Then, the input / output control device 20 continues the input / output processing for a predetermined period (step S35), and then executes the processing from step S33 again.

  In addition, the process of step S13 which sets the parameter regarding a queue as mentioned above may be performed in parallel with the monitoring process of steps S14-S17.

  Next, the operation in step S13 will be described using specific numerical values. For example, in the input / output control device 20, two host devices 90 set to “throughput priority”, one host device 90 set to “IOPS priority”, and a host device 90 set to “default” are set. It is assumed that one host device 90 and one host device 90 set to “custom” are connected. For “throughput priority”, M = 600 and β = 0.6 are set in advance, and for “IOPS priority”, M = 2000 and β = ∞ are set in advance and set to “default”. On the other hand, it is assumed that M = 1000 and β = 1.0 are set. Further, it is assumed that M = 800 and β = 0.8 are input to the host device 90 set to “custom”. Further, consider the case where the total number of queues in the storage system 2 is 10,000 and the threshold α is set to 8000, which is 0.8 times the total number of queues.

  In this case, the total of all the host devices 90 having the minimum number M of queues is 5000. Therefore, the number of queues X that can be used is 5000 obtained by subtracting 5000 from 10,000. Therefore, when the number of queues used in the input / output control device 20 exceeds the threshold value 8000 (Yes in step S33), the host attribute setting unit 21 sets the upper limit of queues that can be used for each host device 90 at high load. The number Y is calculated and set as shown in FIG. The input / output processing unit 12 assigns a queue to each host device 90 according to the set minimum number M and upper limit number Y of queues. As a result, a relatively large number of queues can be assigned to the IOPS-priority host device 90 rather than assigning the queues equally to each host.

  Next, the parameter calculation operation for the new queue in step S18 will be described using specific numerical values. For example, it is assumed that the number of usable queues X is 5000. Further, a case is considered in which 2000, which is the total number of queues of the storage system 2 divided by the number of connected host apparatuses 90, is applied as the IOPS default value γ. At this time, it is assumed that the measured IOPS value from the host device 90 set to “throughput priority” (M = 600, β = 0.6, Y = 1200) is 2500. In this case, the parameter calculation unit 25 calculates the ratio P = 1.25 of the actually measured value 2500 with respect to the IOPS default value γ = 2000. Then, the parameter calculation unit 25 calculates the minimum number of new queues M ′ = 750 by applying the minimum number of queues M = 600 and P = 1.25 so far to Equation (2). To do. The parameter calculation unit 25 calculates the upper limit number Y ′ = 2000 of new queues by applying P = 1.25 and the minimum number of new queues M ′ = 750 to Equation (3). .

  Above, description of operation | movement of the input / output control apparatus 20 is complete | finished.

  It has been described that the host attribute setting unit 21 sets the new parameter calculated in steps S18 to S19 for the host device 90 in which the host attribute is set to “auto” in step S24. In addition, for the host device 90 whose host attribute is set to “auto”, the host attribute setting unit 21 has any host whose input / output request characteristics are “throughput priority”, “default”, or “IOPS priority”. Based on whether it corresponds to the attribute, a parameter set in advance for the corresponding host attribute may be set in step S24.

  Next, the effect of the second exemplary embodiment of the present invention will be described.

  The storage system and the input / output control device according to the second embodiment of the present invention can further improve the input / output performance according to the characteristics of the input / output request that differs for each host device.

  The reason is that the input / output request monitoring unit monitors input / output requests for each host device, and the host attribute determining unit obtains appropriate host attributes and appropriate parameters for each host device based on the monitoring results. This is because the attribute setting unit changes the host attribute and parameter of the host device using the appropriate host attribute and the appropriate parameter obtained by the host attribute determination unit. This is because the present embodiment can set more appropriate parameters in consideration of the characteristics of input / output requests for each host device.

  Furthermore, the host attribute setting unit can assist the user in setting appropriate host attributes and appropriate parameters for each host device by presenting new host attributes and new parameters as recommended settings. Because it can. In addition, the host attribute setting unit can change the settings to appropriate host attributes and appropriate parameters without requiring host attribute or parameter input information for host devices with the host attribute set to auto. That's why.

  In addition, the storage system and the input / output control device according to the second embodiment of the present invention can assign the number of queues more appropriately according to the characteristics of the input / output request that differs for each host device.

  The reason is that the host attribute setting unit sets the minimum number of queues and the upper limit number based on the host attributes set for each host device, and the parameter calculation unit is based on the monitoring result by the input / output request monitoring unit. The minimum number and maximum number of appropriate queues are newly calculated, and the host attribute setting unit determines the minimum number of queues for each host device based on the calculated minimum number and maximum number of queues. This is because the upper limit number can be set.

  In the second embodiment of the present invention, the example in which queues are allocated by setting the minimum number and the upper limit number of queues has been mainly described. However, the present embodiment is not limited to other queue allocation methods. The present invention can also be applied to an input / output control device and a storage system in which is used. In this case, the host attribute setting unit and the parameter calculation unit may set and calculate parameters used in other queue allocation methods. In addition, the host attribute setting unit and the parameter calculation unit have been described mainly with respect to an example in which various parameters are calculated using the equations (1) to (3), but various parameters may be calculated using other equations. . The minimum number M of queues set in advance for each host attribute and the value of the predetermined coefficient β are not limited to the values shown in the above example, and various values can be applied.

  In the second embodiment of the present invention, the parameter calculation unit uses a value obtained by adding a predetermined margin to the average value of the actual measurement values of the data size in a predetermined period, as a method for obtaining an appropriate cache page size. However, an appropriate cache page size may be calculated by other calculation methods based on various monitoring results.

  In the second embodiment of the present invention, three types of throughput priority, default, and IOPS priority are prepared as host attributes, and five types including custom and auto are prepared. . In addition, in the second embodiment of the present invention, the host attribute may be a two-level host attribute with only throughput priority and IOPS priority, or four or more levels of host attributes including throughput priority and IOPS priority are prepared. May be. In the second embodiment of the present invention, the host attribute is not limited to throughput priority and IOPS priority, and any characteristic of the input / output request is changed from the first host attribute to the first according to the degree of the characteristic. Two or more host attributes up to two host attributes may be prepared.

  Further, in each of the embodiments of the present invention described above, the host attribute determination unit has been described as determining a new host attribute appropriate for each host device based on the monitoring result by the input / output request monitoring unit. In addition, the host attribute determination unit may determine a new host attribute appropriate for each host device based on the new parameter calculated by the parameter calculation unit. For example, a range of each parameter may be stored in advance for each host attribute, and a host attribute associated with a range including a newly calculated parameter value may be determined as a new host attribute. .

  Further, in each of the above-described embodiments of the present invention, the example in which the input / output request monitoring unit monitors the information regarding the data size of the input / output request and the information regarding the IOPS has been mainly described. In addition, in each embodiment of the present invention, the input / output request monitoring unit may monitor other information that can determine the characteristics of the input / output request issued by the host device. The host attribute determination unit may determine a new host attribute and a new parameter based on the monitoring result of such other information and the combination of various monitoring results.

  Further, in each of the above-described embodiments of the present invention, it has been described that the WWN is used as the identifier of the host device, but other identification information may be used.

  In each embodiment of the present invention described above, the operation of the input / output control device described with reference to each flowchart is stored in a storage device (storage medium) of the computer device as a computer program of the present invention. The CPU may read and execute the computer program. In such a case, the present invention is constituted by the code of the computer program or a storage medium.

  Moreover, each embodiment mentioned above can be implemented in combination as appropriate.

  The present invention is not limited to the above-described embodiments, and can be implemented in various modes.

A part or all of each of the above-described embodiments can be described as in the following supplementary notes, but is not limited thereto.
(Appendix 1)
An input / output control device provided in a storage system having one or more storage devices,
For each host device that issues an input / output request to the storage device, a host attribute indicating the characteristics of the input / output request of the host device is set, and parameters relating to input / output processing in the own device are set according to the host attribute. A host attribute setting section to perform,
When an input / output request issued from the host device to the storage device is received, an input / output processing unit that executes input / output processing according to the input / output request;
An input / output request monitoring unit for monitoring the input / output request for each host device;
A host attribute discriminating unit that discriminates a new host attribute of the host device for each of the host devices based on a monitoring result by the input / output request monitoring unit, and notifies the discriminated new host attribute to the host attribute setting unit When,
I / O control device with
(Appendix 2)
The host attribute setting unit has a recommended setting presentation unit that outputs information notified from the host attribute determination unit to the outside, and based on information input from the outside in accordance with a presentation process by the recommended setting presentation unit The input / output control apparatus according to appendix 1, wherein the host attribute and the parameter are set for each host apparatus.
(Appendix 3)
The host attribute setting unit presents information notified from the host attribute determining unit by the recommended setting presenting unit, or performs a presentation process by the recommended setting presenting unit based on information notified from the host attribute determining unit. 3. The input / output control apparatus according to appendix 2, wherein the host attribute and the parameter are set for each host apparatus without setting.
(Appendix 4)
The host attribute determination unit has a parameter calculation unit that calculates a new value of the parameter related to the input / output processing for each of the host devices based on the monitoring result, and the new value calculated by the parameter calculation unit 4. The input / output control apparatus according to any one of appendix 1 to appendix 3, wherein a new parameter is notified to the host attribute setting unit together with the new host attribute.
(Appendix 5)
The input / output request monitoring unit monitors the data size in the input / output request for each host device,
Any one of appendix 1 to appendix 4, wherein the host attribute discriminating unit discriminates the new host attribute based on the data size obtained by the input / output request monitoring unit for each host device. I / O controller described in 1.
(Appendix 6)
The input / output request monitoring unit monitors IOPS (Input Output Per Second) in the input / output request for each host device,
The input / output according to any one of appendix 1 to appendix 5, wherein the host attribute discriminating unit discriminates the new host attribute based on the measured value of the IOPS for each host device. Control device.
(Appendix 7)
The host attribute setting unit sets a cache page size in a cache memory used by the input / output processing unit for each host device as the parameter related to the input / output processing. The input / output control apparatus according to any one of the above.
(Appendix 8)
The host attribute setting unit, as the parameter related to the input / output processing, sets a parameter related to the number of queues for storing input / output requests waiting to be processed among the input / output requests received by the input / output processing unit. The input / output control device according to any one of appendix 1 to appendix 7, wherein the input / output control device is set for each of the appendixes.
(Appendix 9)
As the host attribute, a host attribute divided into two or more stages from the first host attribute to the second host attribute is prepared in advance according to the degree to which the input / output request of the host device exhibits arbitrary characteristics. When
The host attribute determination unit determines, for each host device, how many steps to change the host attribute of the host device toward the first host attribute or the second host attribute based on the monitoring result. Any one of appendix 1 to appendix 8, wherein a host attribute obtained by changing the host attribute set in the host device by the determined number of steps in the determined direction is set as the new host attribute. The input / output control device according to claim 1.
(Appendix 10)
The input / output control device according to any one of appendix 1 to appendix 9,
One or more of the storage devices;
Storage system with
(Appendix 11)
For each host device that issues an input / output request for one or more storage devices, a host attribute indicating the characteristics of the input / output request of the host device is set, and parameters related to input / output processing in the own device are set as the host attribute. Set according to
Monitoring I / O requests issued from the host device to the storage device;
Based on the monitoring result of the I / O request, for each host device, determine a new host attribute of the host device,
An input / output control method for changing the host attribute and the parameter for each of the host devices using the determined new host attribute.
(Appendix 12)
The host attribute and the parameter are changed for each of the host devices based on information input from outside by outputting the new host attribute as a recommended setting to the outside. I / O control method.
(Appendix 13)
For each host device that issues an input / output request for one or more storage devices, a host attribute indicating the characteristics of the input / output request of the host device is set, and parameters related to input / output processing in the own device are set as the host attribute. Host attribute setting step to be set according to
An I / O request monitoring step for monitoring an I / O request issued from the host device to the storage device;
A host attribute determination step for determining a new host attribute of the host device for each host device based on the monitoring result in the input / output request monitoring step;
Using the new host attribute determined in the host attribute determination step, a host attribute change step for changing the host attribute and the parameter for each host device;
Is a computer program that causes a computer device to execute.
(Appendix 14)
In the host attribute changing step, the host attribute and the parameter are changed for each host device based on information input from outside by outputting the new host attribute as a recommended setting to the outside. The computer program according to appendix 13.

1, 2 Storage system 10, 20 Input / output control device 11, 21 Host attribute setting unit 12 Input / output processing unit 13 Input / output request monitoring unit 14, 24 Host attribute determination unit 25 Parameter calculation unit 26 Recommended setting presentation unit 80 Storage device 90 Host device

Claims (10)

An input / output control device provided in a storage system having one or more storage devices,
For each host device that issues an input / output request to the storage device , an attribute value indicating the priority of IOPS (Input Output Per Second) or throughput as a changeable host attribute indicating the characteristics of the input / output request of the host device. A host attribute setting unit that sets parameters related to input / output processing in the device according to the host attribute;
When an input / output request issued from the host device to the storage device is received, an input / output processing unit that executes input / output processing according to the input / output request;
An input / output request monitoring unit for monitoring the input / output request for each host device;
Based on the monitoring result by the output request monitoring unit, for each of the host device, to determine a new host attributes of the host device, Ru new host attributes is determined by changes in notifying the host attribute setting unit A host attribute discriminator;
I / O control device with   The host attribute setting unit has a recommended setting presentation unit that outputs information notified from the host attribute determination unit to the outside, and based on information input from the outside in accordance with a presentation process by the recommended setting presentation unit 2. The input / output control apparatus according to claim 1, wherein the host attribute and the parameter are set for each host apparatus.   The host attribute setting unit presents information notified from the host attribute determining unit by the recommended setting presenting unit, or performs a presentation process by the recommended setting presenting unit based on information notified from the host attribute determining unit. 3. The input / output control device according to claim 2, wherein whether to set the host attribute and the parameter without performing the selection is selected for each host device.   The host attribute determination unit has a parameter calculation unit that calculates a new value of the parameter related to the input / output processing for each of the host devices based on the monitoring result, and the new value calculated by the parameter calculation unit 4. The input / output control apparatus according to claim 1, wherein a new parameter is notified to the host attribute setting unit together with the new host attribute. 5. As the host attribute, a host attribute divided into two or more stages from the first host attribute to the second host attribute is prepared in advance according to the degree to which the input / output request of the host device exhibits arbitrary characteristics. When
The host attribute determination unit determines, for each host device, how many steps to change the host attribute of the host device toward the first host attribute or the second host attribute based on the monitoring result. 5. The host attribute obtained by changing the host attribute set in the host device by the number of stages determined and determined in the determined direction is set as the new host attribute. The input / output control apparatus according to any one of the above. The input / output control device according to any one of claims 1 to 5,
One or more of the storage devices;
Storage system with For each host device that issues an input / output request to one or more storage devices , this indicates the priority of IOPS (Input Output Per Second) or throughput as a changeable host attribute that represents the characteristics of the input / output request of the host device. Set the attribute value and set the parameters related to input / output processing in the device according to the host attribute.
Monitoring I / O requests issued from the host device to the storage device;
Based on the monitoring result of the I / O request, for each host device, determine a new host attribute of the host device,
An input / output control method for changing the host attribute and the parameter for each of the host devices using the determined new host attribute.   8. The host attribute and the parameter are changed for each of the host devices based on information input from outside by outputting the new host attribute as a recommended setting to the outside. I / O control method. For each host device that issues an input / output request to one or more storage devices , this indicates the priority of IOPS (Input Output Per Second) or throughput as a changeable host attribute that represents the characteristics of the input / output request of the host device. A host attribute setting step for setting an attribute value and setting a parameter related to input / output processing in its own device according to the host attribute;
An I / O request monitoring step for monitoring an I / O request issued from the host device to the storage device;
A host attribute determination step for determining a new host attribute of the host device for each host device based on the monitoring result in the input / output request monitoring step;
Using the new host attribute determined in the host attribute determination step, a host attribute change step for changing the host attribute and the parameter for each host device;
Is a computer program that causes a computer device to execute.


  In the host attribute changing step, the host attribute and the parameter are changed for each host device based on information input from outside by outputting the new host attribute as a recommended setting to the outside. The computer program according to claim 9.

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