JP2009289166A - Data preservation system - Google Patents

Abstract

An object of the present invention is to prevent a load from being concentrated on a specific unit when data to be stored is distributedly stored.
A center server that manages storage target data transmits the storage target data to an area unit. The area unit 4 and each control unit 5 acquire all the remaining storage capacity information of the area unit 4 and each control unit 5 before transmitting the data to be stored by the center server 1. The area unit 4 transfers the storage target data from the center server 1 to the second control unit 5b having the largest storage remaining amount. The second control unit 5b writes the storage target data from the area unit 4, and transfers the remaining storage target data to the third control unit 5c having the second largest remaining storage capacity. The third control unit 5c also performs the same operation as the second control unit 5b, and transfers the remaining storage target data to the first control unit 5a having the third largest remaining storage capacity.
[Selection] Figure 1

Description

  The present invention relates to a data storage system used for distributed storage of data.

  As a conventional data storage system used for distributed storage of data (data to be stored), a plurality of user PCs (storage units) connected to a LAN (local area network) and a backup management server (data management unit) are provided. A system is known (see, for example, Patent Document 1). In the system of Patent Literature 1, when any user PC receives a backup instruction for a file (data to be saved) from a user, a backup request is transmitted from the user PC that has received the backup instruction to the backup management server. The backup management server that has received the backup request divides the backup target file into a plurality of files, and stores each divided file (divided data) in each user PC.

Further, as another system of Patent Document 1, a system including a plurality of client devices (storage units) connected to the Internet is known. In this system, when any client device receives a backup instruction for a file (data to be saved) from a user, the client device that has received the backup instruction divides the backup target file into a plurality of files ( (Divided data) is stored in each client device.
JP 2004-102842 A

  However, in the system of Patent Document 1, the terminal device or backup management server that has received the backup instruction divides all the storage target data and creates all the divided data to be stored in each storage unit. For this reason, the system of Patent Document 1 has a problem that the load is concentrated on a specific unit (a terminal device or a backup management server that has received a backup instruction) when the storage target data is distributed and stored.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a data storage system capable of preventing a load from being concentrated on a specific unit when storing storage target data in a distributed manner. .

  The invention of claim 1 includes a data management unit for managing data to be stored, and a plurality of storage units each having storage means having an arbitrary storage capacity and connected to the data management unit by a network, The data management unit includes a storage request unit that performs a storage request for storing the storage target data in the plurality of storage units, and each of the plurality of storage units transmits and receives the storage target data. When the saving request is made by the communication means and the data management unit, the data corresponding to the remaining storage capacity of the storage means of the storage target data received by the communication means is divided into data. Storage control means for storing in the storage means, and the divided data is stored in the storage means by the storage control means. If the remaining is stored target data after, and a sending control means for controlling said communication means to transmit the remaining data to be stored in another storage unit.

  According to a second aspect of the present invention, the data management unit according to the first aspect of the present invention includes a relay unit connected to the data management unit and the plurality of storage units via the network. Storage remaining amount confirmation means for requesting confirmation of the remaining amount of storage to the plurality of storage units and acquiring storage remaining amount information relating to all remaining storage amounts of the plurality of storage units, And relay means for relaying the data to be stored from the data management unit to the storage unit having the largest remaining storage capacity.

  According to a third aspect of the present invention, in the second aspect of the invention, the transmission control unit of the plurality of storage units acquires the remaining storage amount information from the relay unit, and the storage control unit stores the divided data in the storage unit. When the storage target data remains after being stored in the storage unit, the communication unit is controlled to transmit the remaining storage target data to the storage unit having the next largest remaining storage amount.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the data management unit makes a request for collecting the data to be stored simultaneously or directly to the plurality of storage units. The collection request means and a plurality of the divided data from the plurality of storage units are acquired together with index information for combining the divided data, and the plurality of divided data are combined by the index information to store the storage target data. Each of the plurality of storage units has a return control means, and the storage control means stores the index information together with the divided data in the storage means, and the return control. When the collection request is made by the data management unit, the means stores the divided data stored in the storage means. Characterized in that together with the index information for controlling said communication means to transmit to said data management unit.

  According to a fifth aspect of the present invention, in the second or third aspect of the invention, the data management unit includes a collection request unit that requests the relay unit to collect the data to be saved, and a plurality of the storage units. And a restoration unit that restores the storage target data by combining a plurality of pieces of the divided data in the order in which the divided data is acquired, and when the collection request is made by the data management unit, The storage unit that stores the large divided data has return request means for making a return request for the divided data, and each of the plurality of storage units is stored in the storage means when the return request is made. Return control means for controlling the communication means to transmit the divided data to the data management unit, and the control by the return control means A second return requesting unit for requesting a return of the divided data stored in the storage unit to the storage unit to which the remaining data to be stored is transmitted under the control of the transmission control unit when transmission of the split data is completed; It is characterized by having.

  According to a sixth aspect of the present invention, in the third aspect of the present invention, the data management unit includes a collection request unit that requests the relay unit to collect the data to be stored, and a plurality of the divided data from the plurality of storage units. And a restoration unit that restores the storage target data by combining a plurality of pieces of the divided data in the order of acquisition, and the relay unit has the largest division when the data management unit makes the collection request. The storage unit that stores data has a return request unit that makes a return request for the divided data, and each of the plurality of storage units stores the divided data stored in the storage unit when the return request is made Is transmitted under the control of the return control means and the return control means for controlling the communication means to transmit to the data management unit. When there is a storage unit that stores divided data smaller than the divided data, when the transmission of the divided data by the control of the return control unit ends, the divided data is stored in the storage unit that stores the divided data next to the divided data. And second return requesting means for requesting return of the next larger divided data.

  The invention of claim 7 is the invention of claim 2 or 3, wherein a plurality of storage systems including the relay unit and the plurality of storage units are provided.

  The invention of claim 8 is characterized in that, in the invention of claim 2 or 3, the relay unit is integrated with one storage unit of the plurality of storage units.

  According to the first aspect of the present invention, each storage unit divides the storage target data according to its own remaining storage capacity and stores it as divided data, whereby the storage target data is distributedly stored in a plurality of storage units. Therefore, when the storage target data is distributedly stored, it is possible to prevent the load from being concentrated on the specific unit as compared with the case where the specific unit divides the storage target data and creates all the divided data.

  According to the invention of claim 2, since the storage unit with the largest remaining storage capacity can be preferentially stored, it is further prevented that the load is concentrated on a specific unit when storing the storage target data in a distributed manner. it can.

  According to invention of Claim 3, since it can memorize | store preferentially from a memory | storage unit with a large memory | storage remaining amount, save object data can be memorize | stored efficiently.

  According to the invention of claim 4, when the data management unit collects data to be stored, the plurality of storage units control the transmission of the divided data together with the index information to the data management unit, so that the data management unit Using the information, the collected divided data can be combined to restore the storage target data.

  According to the invention of claim 5, when the data management unit collects the data to be stored, the plurality of storage units sequentially transmit the large divided data to the data management unit, so that the data management unit collects the data in the order of collection. The data to be saved can be restored by combining the divided data.

  According to the invention of claim 6, when the data management unit collects the data to be saved, the plurality of storage units sequentially transmit the large divided data to the data management unit, so that the data management unit collects the data in the order of collection. The data to be saved can be restored by combining the divided data.

  According to the seventh aspect of the present invention, the storage target data can be distributed and stored in a larger number of storage units by including a plurality of storage systems including a relay unit and a plurality of storage units.

  According to the invention of claim 8, by using one storage unit as a relay unit, the cost can be reduced as compared with a case where separate relay units that do not store storage target data are provided separately.

(Embodiment 1)
In the present invention, for example, monitoring the operating state of various equipment such as lighting equipment and air conditioning equipment and controlling the various equipment are collectively referred to as “management” of the equipment. Therefore, management of equipment means at least one of monitoring and control of equipment. Further, the entire area where the equipment to be managed is arranged is called “management area”, and one small area when the management area is divided into a plurality of small areas is called “area”.

  The management area includes office buildings, housing complexes, hospitals, schools, hotels, gymnasiums, art museums, museums, shopping centers, multiple residential buildings that include multiple buildings, and multiple residential units that have been developed. This is a wide space such as a group of residential areas, theme parks, parks, etc., and a space where many equipments are arranged. On the other hand, the area corresponds to each floor or room of the building, or each section when the land is appropriately divided.

  In the embodiment described below, a lighting device is exemplified as a facility device to be monitored and controlled, and a weighing device that performs electrical metering (measurement of voltage, current, power, etc.) is exemplified as a device to be monitored. .

  Next, the configuration of the device management system (data storage system) according to the first embodiment will be described with reference to FIGS. This equipment management system manages equipment for each area, and as shown in FIG. 1, a center server 1 for overall control of the entire system, and equipment equipment connected to each control or instruction of the center server 1 Are provided with a plurality of area subsystems 2 and 2 for controlling and monitoring equipment. The center server 1 and the plurality of area subsystems 2 and 2 are connected by an upper layer communication network (hereinafter referred to as “upper net”) Ns which is a LAN.

  The upper network Ns uses an IP protocol corresponding to IPv6 in the network layer, and a unique protocol is used as the upper layer protocol. A management computer 3 that monitors and controls the center server 1 is connected to the upper network Ns.

  Each area subsystem 2 is connected to each other by an area unit 4 connected to the center server 1 by an upper network Ns, and an area unit 4 and a middle layer network (hereinafter referred to as “middle network”) Nm. A plurality of control units 5, 5, and 5 and a management unit 6 connected to the area unit 4 by a middle net Nm.

  Each control unit 5 includes a first control unit (lighting control unit) 5a and a third control unit (lighting control unit) 5c that monitor and control the lighting device Ld, and a second that monitors the weighing device Ms. Control unit (measurement management unit) 5b. A lower layer network (hereinafter referred to as “lower network”) Ni1 connected to the illumination control units 5a and 5c is a time division multiplex transmission using a fixed-length transmission signal transmitted through the two-wire signal line Ls1. A communication network is being built. The lower net Ni2 connected to the measurement management unit 5b constructs a communication network by serial communication such as RS-485 and RS-232C or a communication network by Ethernet (registered trademark), and exchanges information through the signal line Ls2.

  Here, the operation of the load control system that constructs the lower net Ni1 will be described. The transmission device CN sends a fixed-length transmission signal to the signal line Ls1 at regular intervals. When the switch SW is operated, the operation terminal TU1 sends an interrupt signal to the signal line Ls1 at a timing synchronized with the transmission signal. Send it out. When receiving the interrupt signal, the transmission device CN requests the return of the address by the transmission signal. The transmission signal is provided with a time slot for placing information returned from the operation terminal TU1.

  When the transmission device CN requests an address to be returned by a transmission signal, the operating terminal TU1 that has generated the interrupt signal returns its own address to the transmission device CN in the time slot. The transmission device CN acquires the on / off state of the switch SW from the operation terminal unit TU1 by the transmission signal designating the acquired address. Furthermore, by comparing with the relation table in which the addresses of the switch SW and the lighting device Ld are related, an address is designated for the lighting device Ld associated with the switch SW and the transmission signal is transmitted via the control terminal TU2. The lighting device Ld is controlled to be turned on / off according to the on / off state of the switch SW acquired from the operation terminal unit TU1.

  Since the illumination control units 5a and 5c are connected to the signal line Ls1, the operation state of the illumination device Ld can be acquired by monitoring the transmission signal. Moreover, the same operation | movement as operation terminal unit TU1 is possible, and it can instruct | indicate lighting / extinguishing of the illuminating device Ld.

  The weighing management unit 5b gives an instruction to the weighing device Ms by serial communication with the weighing device Ms connected to the signal line Ls2, and acquires information from the weighing device Ms. The measuring device Ms measures, for example, instantaneous values and integrated values of voltage, current, and power during operation of the lighting device Ld. Therefore, the weighing management unit 5b can monitor the operation of the lighting device Ld and the like based on the weighing information acquired from the weighing device Ms.

  The area unit 4 can acquire and instruct the operating state of the lighting device Ld through communication with the lighting control units 5a and 5c using setting information described later. Further, the area unit 4 can acquire the weighing information measured by the weighing device Ms through communication with the weighing management unit 5b. The setting information includes communication setting information data and device management setting information data.

  The communication setting information data includes a transmission source IP address during communication, a transmission destination IP address during communication, and a broadcast address within the area. Further, as communication setting information data, the management number for individually managing the lighting control units 5a, 5c and the weighing management unit 5b connected to the area unit 4 is set to the IP address of the lighting control units 5a, 5c and the weighing management unit 5b. Are associated with each other.

  In the device management setting information data, the maximum number of units (including area unit 4, lighting control units 5a and 5c, measurement management unit 5b, and management unit 6) that can be connected in the area to which the area unit 4 is connected, Information on the number of units actually connected to the area is included.

  The area unit 4 makes an acquisition request for the operating state of the lighting device Ld under the control of the lighting control units 5a and 5c, and acquires the operating state. Furthermore, the area unit 4 transmits the acquired operation state to the center server 1. Here, when the area unit 4 receives a control request for the lighting device Ld from the center server 1, the area unit 4 requests the lighting control units 5a and 5c to control the lighting device Ld.

  The management unit 6 stores the types and communication addresses of the devices including the lighting device Ld and the weighing device Ms included in the middle net Nm and the lower nets Ni1 and Ni2 managed by the area unit 4, and the lighting control units 5a and 5c. A backup of the data set in the weighing management unit 5b and the area unit 4 is stored. Further, the management unit 6 holds setting information for each area unit 4. Further, since the management unit 6 stores the backup information, after the repair or replacement of the area unit 4 is completed, the management unit 6 transfers the backup information to the area unit 4 to transfer the area information. Unit 4 can be restored.

  Next, the configuration of the center server 1 will be described with reference to FIG. 2, focusing on the distributed storage of the storage target data D (see FIG. 7). The center server 1 manages the storage target data D, and includes a communication unit 10 that communicates with each area unit 4 and the management unit 6, a storage unit 11 that stores the storage target data D, and a center server. 1 is provided with a control unit 12 that performs overall control.

  The communication unit 10 transmits a signal under the control of the control unit 12, and outputs a signal received via the upper network Ns (see FIG. 1) to the control unit 12.

  The control unit 12 includes a storage request unit (save request unit) 13 for making a storage request for storing the storage target data D in at least two of the area unit 4 and the plurality of control units 5, 5, 5, The collection request unit (collection request means) 14 that requests the unit 4 to collect the storage target data D and the storage target data D from the plurality of divided data D1 to D3 (see FIG. 7) distributed and stored in each control unit 5 A restoring unit (restoring means) 15 for restoring is provided.

  The storage request unit 13 controls the communication unit 10 to transmit a storage request signal corresponding to the storage request to the area unit 4 when the storage target data D is distributed and stored as a plurality of divided data D1 to D3. At this time, the storage request signal is transmitted from the communication unit 10 to the area unit 4.

  The collection request unit 14 distributes and stores the storage target data D as a plurality of divided data D1 to D3 in each control unit 5, and then collects the divided data D1 to D3 that are distributed and stored. The communication unit 10 is controlled to transmit a collection request signal corresponding to the collection request of D3 to the area unit 4. At this time, the collection request signal is transmitted from the communication unit 10 to the area unit 4.

  After the collection request signal is transmitted to the area unit 4 under the control of the collection request unit 14, the restoration unit 15 converts the divided data D <b> 1 to D <b> 3 from the area unit 4 and each control unit 5 into index information I1 and I2 (described below). 7) and via the communication unit 10. The index information I1, I2 is a unique code for connecting the divided data D1 to D3. The restoration unit 15 that has acquired all the divided data D1 to D3 and the index information I1 and I2 restores the storage target data D by combining the plurality of divided data D1 to D3 with the index information I1 and I2.

  As shown in FIG. 3, the area unit 4 communicates between the storage unit (storage means) 40 having an arbitrary storage capacity and the center server 1 using the upper network Ns (see FIG. 1). Unit 41, a lower-level communication unit 42 that communicates with each control unit 5 using a middle net Nm (see FIG. 1), and a control unit 43 that controls the entire area unit 4.

  The upper communication unit 41 transmits a signal under the control of the control unit 43 and outputs a signal received via the upper net Ns to the control unit 43. The lower communication unit 42 transmits a signal under the control of the control unit 43, and outputs the signal received via the intermediate net Nm to the control unit 43.

  The control unit 43 includes a storage remaining amount confirmation unit (storage remaining amount confirmation unit) 44 for confirming the remaining storage amount of the area unit 4 and each control unit 5, and storage target data D (see FIG. 7) from the center server 1. A relay unit (relay unit) 45 for relaying, a storage control unit (storage control unit) 46 for storing a part of the storage target data D in the storage unit 40 as divided data D1 to D3 (see FIG. 7), and the center server 1 Transmission control unit (transmission control unit) 47 for transmitting the storage target data D from the control unit 5 and a return request unit (return request unit) 48 for requesting the return of the divided data D1 to D3 to each control unit 5. And a return control unit (return control means) 49 that causes the center server 1 to transmit the divided data D1 to D3.

  When the storage request signal from the center server 1 is received by the upper communication unit 41, the remaining storage amount confirmation unit 44 confirms the remaining storage amount that is the remaining storage capacity of the storage unit 50 for each control unit 5. The lower communication unit 42 is controlled to transmit a confirmation request signal corresponding to the request. The storage remaining amount confirmation unit 44 that has confirmed the storage remaining amount of each control unit 5 holds the storage remaining amount information regarding the storage remaining amount of the area unit 4 and each control unit 5 and also shares the storage remaining amount information. The lower communication unit 42 is controlled to transmit to each control unit 5. The remaining storage amount information is transmitted from the lower communication unit 42 to each control unit 5.

  In addition, the remaining storage capacity confirmation unit 44 controls the upper communication unit 41 so as to transmit a communication permission signal corresponding to the communication permission of the storage target data D to the center server 1.

  When the remaining storage capacity of the area unit 4 and each control unit 5 is confirmed by the remaining storage capacity confirmation section 44, the relay section 45 performs higher order communication when any of the control units 5 has the largest remaining storage capacity. The lower communication unit 42 is controlled so as to transmit the storage target data D received from the center server 1 received by the unit 41 to the control unit 5 having the largest storage remaining amount. On the other hand, when the area unit 4 has the largest remaining storage capacity, the relay unit 45 outputs the storage target data D from the center server 1 to the storage control unit 46. The storage target data D is temporarily stored from when it is received by the upper communication unit 41 until it is transmitted from the lower communication unit 42 or from when it is received by the upper communication unit 41 until it is output to the storage control unit 46. The data is temporarily stored in the unit 450, and transmitted from the lower-level communication unit 42 to the control unit 5 having the largest storage remaining amount, or is output to the storage control unit 46.

  The storage control unit 46 stores, in the storage unit 40, data corresponding to the remaining storage amount among the storage target data D received by the lower communication unit 42 or the storage target data D input from the relay unit 45 as divided data D1 to D3. Remember. At this time, the storage control unit 46 stores the index information I1 and I2 (see FIG. 7) in the storage unit 40 together with the divided data D1 to D3.

  If the storage target data D remains after the storage control unit 46 stores the divided data D1 to D3 in the storage unit 40, the transmission control unit 47 controls the remaining storage target data D with the next largest remaining storage amount. The lower-level communication unit 42 is controlled to transmit to the unit 5.

  When the collection request signal from the center server 1 is received by the upper communication unit 41, the return request unit 48 is configured to transmit a return request signal corresponding to the return request for the divided data D1 to D3 to each control unit 5. The communication unit 42 is controlled.

  When the collection request signal from the center server 1 is received by the upper communication unit 41, the return control unit 49 transmits the divided data D1 to D3 stored in the storage unit 40 to the center server 1 together with the index information I1 and I2. Thus, the upper communication unit 41 is controlled.

  As illustrated in FIG. 5, the storage unit 40 includes an OS / middleware area 400, an application area 401, and a storage area 402. The divided data D1 to D3 (see FIG. 7) are stored in the free area 404 that is a part of the free area 403 in the storage area 402.

  Each control unit 5 has a basic configuration similar to that of the area unit 4, and as shown in FIG. 4, a storage unit (storage means) 50 having an arbitrary storage capacity and a middle net Nm (FIG. 1). Between the upper unit communication unit (communication means) 51 that communicates with the area unit 4 and the other control unit 5 using the lower unit nets Ni1 and Ni2 (see FIG. 1). A lower communication unit 52 that performs communication and a control unit 53 that controls the entire control unit 5 are provided.

  The upper communication unit 51 transmits a signal under the control of the control unit 53, and outputs the signal received via the intermediate net Nm to the control unit 53. For example, the upper communication unit 51 receives the storage target data D (see FIG. 7) from the area unit 4 or another control unit 5.

  The control unit 53 causes the storage control unit (storage control unit) 54 to store the divided data D1 to D3 (see FIG. 7) in the storage unit 50 and transmits the storage target data D to the other control unit 5 or the area unit 4. A transmission control unit (transmission control unit) 55 and a return control unit (return control unit) 56 for transmitting the divided data D1 to D3 to the center server 1 are provided.

  The storage control unit 54 causes the storage unit 50 to store data corresponding to the remaining storage amount among the storage target data D received by the higher-level communication unit 51 as the divided data D1 to D3. At this time, the storage control unit 54 stores the index information I1 and I2 (see FIG. 7) in the storage unit 50 together with the divided data D1 to D3.

  If the storage target data D remains after the storage control unit 54 stores the divided data D1 to D3 in the storage unit 50, the transmission control unit 55 controls the remaining storage target data D with the next largest remaining storage amount. The host communication unit 51 is controlled to transmit to the unit 5. The remaining storage target data D is temporarily stored in the temporary storage unit 550 until it is transmitted from the lower-level communication unit 52 after being received by the higher-level communication unit 51, and the control having the largest storage remaining amount is performed from the lower-level communication unit 52. Sent to unit 5.

  When the return request signal from the area unit 4 is received by the upper communication unit 51, the return control unit 56 sends the divided data D1 to D3 stored in the storage unit 50 together with the index information I1 and I2 via the area unit 4. The host communication unit 51 is controlled so as to transmit to the center server 1.

  The storage unit 50 has the same configuration as the storage unit 40 (see FIG. 3) of the area unit 4, and includes an OS / middleware area 500, an application area 501, and a storage area 502, as shown in FIG. ing. The divided data D1 to D3 (see FIG. 7) are stored in the free area 504 that is a part of the free area 503 in the storage area 502.

  In the area unit 4 and each control unit 5 (first to third control units 5a to 5c) as described above, the remaining storage capacity of the area unit 4 and the first to third control units 5a to 5c is as shown in FIG. 7A, the storage target data D shown in FIG. 7A is distributed and stored as divided data D1 to D3 in the first to third control units 5a to 5c as shown in FIG. 7B. . In the second control unit 5b having the largest remaining storage capacity, the largest divided data D1 is stored first, and in the second control unit 5c having the second largest remaining storage capacity, the second largest divided data D2 is stored. Is stored next, and the third largest divided data D3 is stored last in the first control unit 5a having the third largest remaining storage capacity.

  In each of the divided data D1 to D3 stored in the first to third control units 5a to 5c, a header H is added to the first data. In the header H, as shown in FIG. 7C, storage target data type information H1 indicating the contents of the storage target data D, a storage target data identification number H2 for identifying the storage target data D, It consists of storage date information H3 of the divided data D1 to D3.

  In addition, index information I1 and I2 is attached to a connection portion of each of the divided data D1 to D3. As shown in FIG. 7D, the connection relation of the divided data D1 to D3 is attached to each index information I1 and I2. Is included. As shown in FIG. 7B, the divided data D2 can be combined with the divided data D1 next to the divided data D1 by the index information I1 of the divided data D1 and the index information I1 of the divided data D2. Similarly, the divided data D3 can be combined after the divided data D2 by the index information I2 of the divided data D2 and the index information I2 of the divided data D3.

  In the case of the remaining storage capacity as shown in FIG. 6, the area unit 4 has no storage capacity because the storage capacity of the area unit 4 is 0. In the case (when it is not 0), the area unit 4 also stores the divided data that is a part of the storage target data D, similarly to the first to third control units 5a to 5c.

  In the device management system of the present embodiment having the above-described configuration, the center server 1 shown in FIG. 1 corresponds to the data management unit of the present invention, and the area unit 4 is a storage unit integrated with the relay unit of the present invention. Each control unit 5 (first to third control units 5a to 5c) corresponds to a storage unit of the present invention.

  Next, an operation of distributing and storing the storage target data D (see FIG. 7) in the device management system of the present embodiment will be described with reference to FIG. First, the center server 1 transmits a storage request signal to the area unit 4 (S1 in FIG. 8). The area unit 4 transmits a confirmation request signal to all the control units 5 (5a to 5c) (S2). Thereafter, the area unit 4 acquires the remaining storage information of all the control units 5 (5a to 5c), and transmits the acquired remaining storage information to all the control units 5 (5a to 5c) (S3). Thereafter, the area unit 4 transmits a communication permission signal to the center server 1 (S4).

  The center server 1 transmits the storage target data D to the area unit 4 (S5). The area unit 4 transfers the storage target data D from the center server 1 to the second control unit 5b having the largest remaining storage capacity (S6). The second control unit 5b writes the storage target data D from the area unit 4 (S7). Thereafter, the second control unit 5b determines whether or not the remaining storage capacity is exhausted (S8). When there is a remaining storage capacity, the process returns to step S7, and the second control unit 5b continues to write the storage target data D from the area unit 4. On the other hand, when there is no remaining storage capacity, the second control unit 5b transfers the remaining storage target data D to the third control unit 5c (S9).

  The third control unit 5c writes the storage target data D from the second control unit 5b (S10). Thereafter, the third control unit 5c determines whether or not the remaining storage capacity is exhausted (S11). When there is a remaining storage capacity, the process returns to step S10, and the third control unit 5c continues to write the storage target data D from the second control unit 5b. On the other hand, when there is no remaining storage, the third control unit 5c transfers the remaining storage target data D to the first control unit 5a (S12).

  The first control unit 5a writes the storage target data D from the third control unit 5c (S13).

  By performing the above operation, the device management system of the present embodiment distributes and stores all the storage target data D of the center server 1 as the divided data D1 to D3 (see FIG. 7) in the respective control units 5 (5a to 5c). be able to. A sequence diagram of the above operation is shown in FIG.

  Next, an operation of collecting the storage target data D (see FIG. 7) that is distributed and stored in the device management system of the present embodiment will be described with reference to FIG. First, the center server 1 transmits a collection request signal to the area unit 4 (S21 in FIG. 10). The area unit 4 transmits a return request signal to each control unit 5 (5a to 5c) (S22). Each control unit 5 (5a to 5c) returns the divided data D1 to D3 (see FIG. 7) to the center server 1 (S23). The center server 1 combines the divided data D1 to D3 using the index information I1 and I2 (see FIG. 7) to restore the storage target data D (S24).

  By performing the above operation, the device management system according to the present embodiment can restore the storage target data D by combining the divided data D1 to D3 distributed and stored in the control units 5 (5a to 5c). . A sequence diagram of the above operation is shown in FIG.

  As described above, according to the present embodiment, the control units 5, 5, and 5 divide the storage target data D (see FIG. 7) according to their own remaining storage capacity and obtain the divided data D1 to D3 (see FIG. 7). By storing, the storage target data D can be distributed and stored in a plurality of control units 5, 5, and 5. Therefore, when storing the storage target data D in a distributed manner, a specific unit (for example, a center server or one unit) is stored. The control unit can divide the storage target data and create all the divided data, thereby preventing the load from being concentrated on a specific unit. In particular, according to the present embodiment, since the control unit 5 having the largest remaining storage capacity can be preferentially stored, it is possible to further prevent the load from being concentrated on a specific unit and to efficiently store the storage target data D. It can be memorized well.

  In particular, it is not necessary to manage the number of terminals and the remaining storage capacity of each control unit 5 on the center server 1 side. Further, there is no need to divide the storage target data D on the center server side. Thereby, according to this embodiment, when the storage target data D is distributed and stored, the processing of the center server 1 can be reduced.

  Further, according to the present embodiment, when the center server 1 collects the storage target data D, the plurality of control units 5 use the divided data D1 to D2 (see FIG. 7) as index information I1, I2 (see FIG. 7). ) And the center server 1 can restore the storage target data D by combining the collected divided data D1 to D3 using the index information I1 and I2.

  Furthermore, according to the present embodiment, by using one storage unit as the area unit 4, it is possible to reduce costs compared to a case where separate relay units that do not store the storage target data D are separately provided.

  In the device management system of the first embodiment, the area unit 4 and each control unit 5 store the divided data. However, as a modification of the first embodiment, the area unit 4 does not store the divided data. Only each control unit 5 may store the divided data.

  In the first embodiment, when the center server 1 collects the divided data D1 to D3 (the storage target data D that is distributed and stored), the center server 1 transmits a collection request signal to the area unit 4, and the area unit 4 describes the system that transmits a return request signal to each control unit 5, but as a modification of the first embodiment, the center server 1 collects the divided data D1 to D3 (the storage target data D that is distributed and stored). Sometimes, the center server 1 may transmit the collection request signal all at once to the respective control units 5 by broadcast or multicast.

(Embodiment 2)
As shown in FIG. 12, the device management system of the second embodiment is different from that of the first embodiment in that each control unit 5 stores the divided data D1 to D3 without attaching the index information I1 and I2 (see FIG. 7). Different from the device management system. In addition, about the component similar to Embodiment 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  When the collection request signal from the center server 1 is received by the upper communication unit 41, the return request unit 48 of the area unit 4 shown in FIG. 3 transmits a return request signal to the control unit 5 that stores the largest divided data D1. Thus, the lower communication unit 42 is controlled. The return request unit 48 uses the storage remaining amount information held by the storage remaining amount confirmation unit 44 when storing the storage target data D, and sends the control unit 5 having the largest storage remaining amount to the largest divided data D1. The control unit 5 may be stored, or the control unit 5 that is the transmission destination of the storage target data D by the relay unit 45 may be the control unit 5 that stores the largest divided data D1.

  When the return request signal from the area unit 4 or another control unit 5 is received by the upper communication unit 51, the return control unit 56 of each control unit 5 according to the present embodiment stores the divided data stored in the storage unit 50. The host communication unit 51 is controlled to transmit D1 to D3 to the center server 1 via the area unit 4.

  Further, each control unit 5 of the present embodiment has the control unit 5 or the area unit 4 that stores the divided data D2, D3 smaller than the divided data D1, D2 transmitted by the control of the return control unit 56. When the transmission of the divided data D1, D2 under the control of the return control unit 56 is completed, the divided data D2, D3 is stored in the control unit 5 (or area unit 4) that stores the divided data D2, D3 next to the divided data D1, D2. A return request unit (second return request means) 57 for making a return request for D3 is further provided.

  In the present embodiment, the control unit 5 (or area unit 4) that stores the divided data D2 and D3 that are the next larger than the divided data D1 and D2 is the control of the transmission control unit 55 when the storage target data D is distributed and stored. Is the control unit 5 (or area unit 4) to which the remaining storage target data D is transmitted. Therefore, the return control unit 56 makes a return request for the divided data D2 and D3 to the control unit 5 (or the area unit 4).

  The restoration unit 15 of the center server 1 of the present embodiment acquires the divided data D1 to D3 from each control unit 5 via the communication unit 10 in order after the collection request signal is transmitted under the control of the collection request unit 14. . The restoration unit 15 that has acquired the divided data D1 to D3 combines the divided data D1 to D3 in the order of acquisition to restore the storage target data D.

  Next, an operation of collecting the storage target data D (see FIG. 12) distributed and stored in the device management system of the present embodiment will be described with reference to FIG. First, the center server 1 transmits a collection request signal to the area unit 4 (S31 in FIG. 13). The area unit 4 transmits a return request signal to the second control unit 5b that stores the largest divided data D2 (see FIG. 12) (S32).

  The second control unit 5b returns the divided data D1 to the center server 1 (S33). Thereafter, the second control unit 5b determines whether or not all the divided data D1 has been returned to the center server 1 (S34). If all the divided data D1 have been returned to the center server 1, the second control unit 5b transmits a return request signal to the third control unit 5c that stores the second largest divided data D2 (S35).

  The third control unit 5c returns the divided data D2 to the center server 1 (S36). Thereafter, the third control unit 5c determines whether or not all the divided data D2 has been transmitted to the center server 1 (S37). If all the divided data D2 has been transmitted to the center server 1, the third control unit 5c transmits a return request signal to the first control unit 5a that stores the third largest divided data D3 (S38).

  The first control unit 5a returns the divided data D3 to the center server 1 (S39). Thereafter, the center server 1 combines the divided data D1 to D3 from the first to third control units 5a to 5c to restore the storage target data D (S40).

  By performing the above operation, the device management system according to the present embodiment can restore the storage target data D by combining the divided data D1 to D3 distributed and stored in the control units 5 (5a to 5c). . A sequence diagram of the above operation is shown in FIG.

  As described above, according to the present embodiment, when the center server 1 collects the storage target data D, the plurality of control units 5 sequentially transmit the large divided data D1 to D3 to the center server 1, whereby the center server 1. However, it is possible to restore the storage target data D by combining the divided data D1 to D3 in the order of collection.

(Embodiment 3)
The device management system of the third embodiment is different from the device management systems of the first and second embodiments in that the storage target data D (see FIG. 7) is distributed and stored in the plurality of area subsystems 2 and 2. In addition, about the component similar to Embodiment 1, 2, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  Each area subsystem 2 includes an area unit 4, a plurality of control units 5, 5, and 5, and a management unit 6, similarly to the area subsystem 2 of the first and second embodiments. The area subsystem 2 of this embodiment corresponds to the storage system of the present invention.

  As described above, according to the present embodiment, by providing the plurality of area subsystems 2 and 2, the storage target data D can be distributed and stored in more control units 5.

1 is a configuration diagram of a device management system according to Embodiment 1. FIG. It is a block diagram which shows the structure of the center server which concerns on the same as the above. It is a block diagram which shows the structure of the area unit which concerns on the same as the above. It is a block diagram which shows the structure of the control unit which concerns on the same as the above. It is a block diagram which shows the structure of the memory | storage part of the control unit which concerns on the same as the above. It is a figure which shows an example of the memory | storage remaining amount of the area unit which concerns on the same as the above, and each control unit. In the same as above, (a) is a diagram showing data to be stored, (b) is a diagram showing divided data, (c) is a diagram showing a configuration of a header, and (d) is a diagram showing index information. It is a flowchart which shows the operation | movement which carries out the distributed storage of the preservation | save object data in the apparatus management system which concerns on the same as the above. It is a sequence diagram which shows the operation | movement which carries out the distributed storage of the preservation | save object data in the apparatus management system concerning the same as the above. It is a flowchart which shows the operation | movement which collects preservation | save object data in the apparatus management system which concerns on the same as the above. It is a sequence diagram which shows the operation | movement which collects preservation | save object data in the apparatus management system which concerns on the same as the above. It is a figure which shows the division data in Embodiment 2. It is a flowchart which shows the operation | movement which collects preservation | save object data in the apparatus management system which concerns on the same as the above. It is a sequence diagram which shows the operation | movement which collects preservation | save object data in the apparatus management system which concerns on the same as the above.

Explanation of symbols

1 Center server (data management unit)
13 Save request part (Save request means)
14 Collection request section (collection request means)
15 Restoration unit (restoration means)
2 Area subsystem (storage system)
4 Area unit (relay unit, storage unit)
40 storage unit (storage means)
44 Remaining storage amount confirmation unit (remaining storage amount confirmation means)
45 Relay section (relay means)
450 Temporary storage unit 46 Storage control unit (storage control means)
47 Transmission Control Unit (Transmission Control Unit)
48 Return request section (Return request means)
49 Return control section (return control means)
5 Control unit (storage unit)
5a 1st control unit 5b 2nd control unit 5c 3rd control unit 50 Memory | storage part (memory | storage means)
51 Host communication unit (communication means)
54 Storage Control Unit (Storage Control Unit)
55 Transmission Control Unit (Transmission Control Unit)
56 Return control unit (return control means)
57 Return request section (second return request means)
Ns Higher level network (network)
Nm Medium network (network)

Claims (8)

A data management unit for managing data to be stored, and a plurality of storage units each having storage means having an arbitrary storage capacity and connected to the data management unit by a network;
The data management unit includes a storage request unit that performs a storage request for storing the storage target data in the plurality of storage units,
Each of the plurality of storage units includes a communication unit that transmits / receives the storage target data, and the storage unit among the storage target data received by the communication unit when the storage request is made by the data management unit. Storage control means for storing data corresponding to the remaining storage capacity, which is the remaining storage capacity, in the storage means as divided data, and the storage target data after the divided data is stored in the storage means by the storage control means A data storage system comprising: a transmission control unit that controls the communication unit to transmit the remaining storage target data to another storage unit when data remains. A relay unit connected to the data management unit and the plurality of storage units by the network;
When the storage request is made by the data management unit, the relay unit makes a confirmation request for the remaining storage capacity to the plurality of storage units and stores the remaining storage regarding all remaining storage capacity of the plurality of storage units. 2. The data according to claim 1, further comprising: a storage remaining amount confirmation unit that acquires amount information; and a relay unit that relays the storage target data from the data management unit to a storage unit having the largest storage amount. Preservation system.   The transmission control unit of the plurality of storage units acquires the storage remaining amount information from the relay unit, and the storage target data remains after the divided data is stored in the storage unit by the storage control unit. 3. The data storage system according to claim 2, wherein the communication unit is controlled to transmit the remaining storage target data to the storage unit having the next largest storage capacity. The data management unit includes a collection request unit that simultaneously or indirectly collects the storage target data to the plurality of storage units, and a plurality of the divided data from the plurality of storage units. Reconstructing means for reconstructing the storage target data by obtaining together with the index information for combining them and combining the plurality of divided data by the index information;
Each of the plurality of storage units has return control means, the storage control means stores the index information together with the divided data in the storage means, and the return control means is the data management unit. 4. When the collection request is made, the communication unit is controlled to transmit the divided data stored in the storage unit together with the index information to the data management unit. The data storage system according to claim 1. The data management unit is configured to combine the plurality of pieces of divided data in the order obtained by acquiring the plurality of pieces of divided data from the plurality of storage units in order, and a collection request unit that requests the relay unit to collect the data to be stored. And restoring means for restoring the data to be saved,
The relay unit has return request means for making a return request for the divided data in a storage unit that stores the largest divided data when the collection request is made in the data management unit,
Each of the plurality of storage units includes a return control unit that controls the communication unit to transmit the divided data stored in the storage unit to the data management unit when the return request is made; When the transmission of the divided data by the control of the return control means is completed, a request for returning the divided data stored in the storage unit is made to the storage unit to which the remaining data to be saved is transmitted by the control of the transmission control means. The data storage system according to claim 2 or 3, further comprising: 2 return request means. The data management unit is configured to combine the plurality of pieces of divided data in the order obtained by acquiring the plurality of pieces of divided data from the plurality of storage units in order, and a collection request unit that requests the relay unit to collect the data to be stored. And restoring means for restoring the data to be saved,
The relay unit has return request means for making a return request for the divided data in a storage unit that stores the largest divided data when the collection request is made in the data management unit,
Each of the plurality of storage units includes a return control unit that controls the communication unit to transmit the divided data stored in the storage unit to the data management unit when the return request is made; When there is a storage unit that stores divided data smaller than the divided data transmitted by the control of the return control means, when transmission of the divided data by the control of the return control means ends, the divided data that is next larger than the divided data The data storage system according to claim 3, further comprising: a second return request unit that makes a return request for the divided data next to the divided data in the storage unit for storing the divided data.   4. The data storage system according to claim 2, further comprising a plurality of storage systems including the relay unit and the plurality of storage units.   4. The data storage system according to claim 2, wherein the relay unit is integrated with one storage unit of the plurality of storage units.

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