JP6364773B2 - Information processing apparatus, information processing system, memory replication method, and computer program - Google Patents

Description

  The present invention relates to a memory replication technique using an information processing apparatus (computer).

  When a failure occurs in an active information processing apparatus that provides a service (hereinafter abbreviated as “active apparatus” in this specification), a standby information processing apparatus (hereinafter, referred to in this specification). There is known a technique for continuing a service by abbreviated as “backup apparatus”. As part of that technology, memory replication technology is used. Memory replication is a memory synchronization technique that enables information stored in the memory of the active system device to be used also in the standby system device when the standby system device takes over the service.

  In a virtualization system using virtualization technology, when a failure occurs in a guest OS (Operating System) in which an application providing a service operates, memory replication is generally performed by the host OS. It is.

  As a related technique, Patent Document 1 discloses a computer device that takes over the state of an active guest OS immediately before a hardware failure is detected in an active (operating) server device to a standby guest OS operating in the standby server device. Is disclosed. In the device described in Patent Document 1, a synchronization unit, a failure detection unit, and a takeover control unit are provided in the active server device. While the active server device operates normally, the synchronization unit notifies the standby server device of the context indicating the latest state of the active guest OS as synchronization data for each IO process or at a constant cycle. That is, the synchronization unit continuously performs memory synchronization processing for matching the state of the standby guest OS with the state of the active guest OS until a failure is detected in the active server device.

  When the failure detection unit detects a hardware failure prior to the active guest OS, the takeover control unit provides information indicating the status of the active guest OS before the failure is recognized, and the IO issued at the time of the failure A copy of the request is output to the external device. The standby guest OS can take over the processing from the state of the active guest OS immediately before the detection of the failure by using the output information and the request copy in addition to the information held by memory synchronization until then. .

  Patent Document 2 discloses a method in which a host OS that manages a plurality of virtual machines (guest OSs) recovers a guest OS that has stopped abnormally. In the method described in Patent Document 2, a snapshot management control unit and an abnormality detection unit that operate in the host OS are provided. While each guest OS is operating normally, the snapshot management control unit copies the contents of the CPU and memory assigned to the specified guest OS at a specified time or a predetermined time interval, and copies the copied information. Memory synchronization is performed in which the snapshot is stored in the storage device. When the abnormality detection unit detects an abnormality in any of the guest OSes, the snapshot management unit uses a snapshot corresponding to the guest OS in which the abnormality is detected from the information held in the storage device. To restore the guest OS. In other words, the snapshot management unit recovers by newly starting a spare guest OS that takes over the processing of the guest OS in which an abnormality has occurred. In this way, it is possible to restore the guest OS immediately before the time when the guest OS is abnormally stopped without having to make the host OS and the virtual machine redundant.

WO2012 / 070102 JP 2011-060055 A

  However, in the technologies disclosed in Patent Literature 1 and Patent Literature 2, memory synchronization is always performed (standby) during standby until it becomes necessary to take over the processing of the active guest OS to the standby guest OS. There is a problem that needs to be done. That is, the related technology described above always requires spare capacity such as the memory capacity of the storage device that holds the memory information of the active device copied by memory synchronization and the communication bandwidth required for memory synchronization in the standby device. It is.

  One object of the present invention is to provide an information processing apparatus capable of performing memory replication with a small amount of spare resources required for memory synchronization during standby until processing takes over (switching) from an active system apparatus to a standby system apparatus. And so on.

  In order to achieve the above object, an information processing apparatus according to the present invention has the following configuration.

An information processing apparatus of the present invention includes a storage device that stores a replication target, an active device, and a standby device, and the active device includes a replication processing unit that operates on a host operating system (host OS); A virtual machine that operates on the host OS and includes a guest operating system (guest OS) and applications, a part used by the host OS, a part used by the replication processing unit, and a part used by the guest OS and a portion not a duplicate of the object at a portion where the application uses, and a main memory device including a target portion of the replication at the portion where the application uses the application, a portion where the application uses Replication target that notifies the memory space information where the target part of the replication is stored It has a notification section, the replication processing unit, the said memory space information notified from the replicated notification unit, and stored in the storage device, receiving an instruction to the switching instruction to be carried out the service in the standby system device In this case, based on the memory space information stored in the storage device, a portion to be copied is read out by a portion used by the application and transferred to the standby system device.

According to the information processing method of the present invention, a storage device that stores an object to be replicated and an active device connected to a standby device have a part used by a host operating system (host OS), a part used by a replication process, a guest A main storage device including a part used by an operating system (guest OS), a part used by an application and not a target of copying, and a part used by the application and a part to be copied system device, said replication process that runs on the host OS, the runs on the host OS to operate the virtual machine containing the application and the guest OS, the application, the replication at a portion where the application uses The memory space information in which the target part is stored is notified and the record is Application process, on the basis of the save memory space information in the storage device, if the service has received an instruction to the switching instruction to be performed in the standby system device, the memory space information stored in the storage device Then, the part to be copied is read out by the part used by the application and transferred to the standby system apparatus.

  The object is also achieved by an information processing apparatus having each of the above-described configurations and a corresponding method by a computer program realized by a computer and a computer-readable storage medium storing the computer program. Is done.

  The present invention has an effect of enabling memory replication that requires a small amount of equipment in a standby standby apparatus.

It is a block diagram which shows the structure of the information processing system which concerns on the 1st Embodiment of this invention. 5 is a flowchart illustrating a preparatory operation performed by an active system device 1 in the first embodiment. 4 is a flowchart illustrating a memory replication operation performed by an active system device 1 and a standby system device 21 in the first embodiment. It is a schematic diagram which shows an example of the usage condition of the memory space of the main memory device 6 in 1st Embodiment. It is a block diagram which shows the structure of the information processing system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the information processing system which concerns on the 3rd Embodiment of this invention. 10 is a flowchart illustrating an operation performed by a boot processing unit 201 in the third embodiment. It is a block diagram which shows the structure of the information processing system which concerns on the 4th Embodiment of this invention. It is a figure which illustrates the structure of the computer (information processing apparatus) applicable to the information processing system which concerns on each embodiment of this invention.

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

<First Embodiment>
FIG. 1 is a block diagram showing a configuration of an information processing system according to the first embodiment of the present invention.

  Referring to FIG. 1, the information processing system according to the present embodiment includes a first information processing device (active system device) 1, a storage device 11, and a second information processing device (standby system device) 21. In the present embodiment, when the switching instruction 30 is received, a service (processing) provided by the first information processing apparatus 1 (hereinafter referred to as “active system apparatus 1”) is transferred to the second information processing apparatus 21 (hereinafter referred to as “active system apparatus 1”). , An information processing system that enables the “standby system 21” to take over.

  The switching instruction 30 is information for instructing to perform (switch) the service provided by the active system apparatus 1 in another standby system apparatus. The switching instruction 30 may further include replication (duplication) destination information indicating the standby system 21 that is the switching destination.

  The active system device 1 and the standby system device 21 can communicate with each other via a communication network (hereinafter simply referred to as a network) 1000 such as the Internet or a local area network (LAN). The active system device 1 and the standby system device 21 are general information processing devices (computers) that operate under the control of a computer program (software program) executed using a CPU (Central Processing Unit: not shown). It may be constituted by. Alternatively, each unit of the active system device 1 and the standby system device 21 may be configured by a dedicated hardware device or a logic circuit. A hardware configuration example in which the active system device 1 and the standby system device 21 are realized by a computer will be described later with reference to FIG.

  The storage device 11 is a storage device that can be used from the active system device 1. In the present embodiment, the storage device 11 is connected to the active system device 1. The storage device 11 may be built in the active system device 1. The storage device 11 may be a non-volatile storage device such as an HDD (Hard Disk Drive). Further, the storage device 11 is not necessarily a separate storage device from the main storage device 6. For example, the storage device 11 may be a specific storage area other than an area used by a virtual machine 3 to be described later and a functional unit included in the virtual machine 3.

  The active system device 1 includes a host OS 2, a virtual machine 3, a main storage device 6, and a replication processing unit 8. The virtual machine 3 includes a guest OS 4 and an application 5 that operates under the control of the guest OS 4. In the following description, for example, operating under the control of the host OS 2 is referred to as “operating on the host OS 2”. That is, the application 5 says “runs on the guest OS 4”.

  The host OS 2 implements a virtual machine 3 which is a virtual machine (VM, Virtual Machine) in the active system device 1. That is, the host OS 2 provides the guest OS 4 and virtual machine resources such as memory and communication resources, and performs memory management and communication control related to the virtual machine resources. In addition, the host OS 2 provides general OS functions such as memory management and communication control to processes operating on the host OS 2 such as the replication processing unit 8.

  The guest OS 4 is an OS that operates in the virtual machine 3 provided by the host OS 2. The guest OS 4 can operate the application 5 in the virtual machine 3.

  The main storage device 6 can store replication target data 9 generated according to the operation of the application 5. The replication target data 9 is information necessary for the application 25 taking over the process (service) executed by the application 5 to restore the service. The main storage device 6 is realized by, for example, a semiconductor memory device or a disk device.

  The application 5 operates on the guest OS 4. The application 5 is a main body that provides a service in the active device 1. The service taken over by the standby apparatus 21 described above is a service provided by the application 5. The application 5 includes a duplication target notification unit 7.

  The replication target notification unit 7 notifies the replication processing unit 8 described later of memory information indicating a memory space in which the replication target data 9 is stored.

  The replication processing unit 8 operates on the host OS 2. When the replication processing unit 8 receives the notification indicating the memory information from the replication target notification unit 7, the replication processing unit 8 stores the notified memory information as the replication target memory information 12 in the storage device 11. Thereafter, when the replication processing unit 8 receives the switching instruction 30 from any process or external device operating in the active system device 1, the replication processing data is based on the stored replication target memory information 12. 9 is read out. Then, the replication processing unit 8 transfers the read replication target data 9 to the standby system device 21. Hereinafter, a series of operations in the replication processing unit 8 after receiving the switching instruction 30 is also referred to as transfer processing.

  The standby system device 21 includes a host OS 22, a virtual machine 23, a main storage device 26, and a recovery processing unit 27. The virtual machine 23 includes a guest OS 24 and an application 25 that operates on the guest OS 24. The relationships and functions of the host OS 22, virtual machine 23, guest OS 24, and application 25 as a virtualization system are the same as those of the host OS 2, virtual machine 3, guest OS 4, and application 5 in the active system device 1.

  However, at least the application 25 is different in that the operation is started after the restoration processing unit 27 described later instructs the restoration of the service.

  The recovery processing unit 27 receives the replication target data 9 transferred from the replication processing unit 8 in the active device 1 and stores (overwrites) the received replication target data 9 in the corresponding memory space in the main storage device 26. Thereafter, the recovery processing unit 27 transmits a recovery instruction for instructing recovery of the service being executed by the application 5 to the application 25 operating in the standby apparatus 21.

  The application 25 can provide the same service as the application 5. The application 25 takes over the service of the application 5 based on the replication target data 9 stored by the recovery processing unit 27 after the application 5 stops providing the service in the active system device 1.

  Next, the operation of the present embodiment having the above-described configuration will be described in detail. The operation of the information processing system according to the present embodiment is configured by a two-stage operation including a preparatory operation and a memory replication operation (replication operation).

  First, with reference to FIG. 2, the operation in advance preparation is demonstrated. FIG. 2 is a flowchart showing a preparatory operation performed by the active system device 1 in the first embodiment.

  At the time of starting the preparatory operation, the state of the active system device 1 is as shown in FIG. That is, the host OS 2, guest OS 4, application 5, and replication processing unit 8 are operating. In addition, the copy target data 9 already exists in the main storage device 6. However, the copy target memory information 12 in the storage device 11 does not yet exist. The replication target memory information 12 is generated by a preparatory operation.

  Further, the standby apparatus 21 does not need to operate in particular during the preparation operation.

  In the preparation operation, first, in the active device 1, the replication target notification unit 7 notifies the replication processing unit 8 of memory information indicating the memory space in which the replication target data 9 is stored (step) A100). Here, the replication target data 9 is information necessary when the application 25 in the standby system 21 restores the service of the application 5 later. The replication target data 9 is data to be replicated in the memory replication operation described later.

  The replication target data 9 is stored in the main storage device 6 as shown in FIG. FIG. 4 is a schematic diagram illustrating an example of a usage state of the memory space of the main storage device 6 according to the first embodiment. Referring to FIG. 4, the main storage device 6 includes a memory space 502 used by the host OS, a memory space 503 used by replication-related functional units such as the replication processing unit 8, a memory space 504 used by the guest OS, and There are memory spaces 505 and 506 used by applications. The memory space used by the application is divided into a replication target memory space 506 that stores the replication target data 9 and a memory space 505 that does not include the replication target data 9. In step A100, the replication target notification unit 7 notifies the memory information indicating the replication target memory space 506 used by the application. The replication target notification unit 7 may acquire the range of the replication target memory space 506 from, for example, a setting file (not shown).

  Next, the replication processing unit 8 receives a notification of memory information indicating the memory space in which the replication target data 9 is stored (step B110). Then, the replication processing unit 8 stores the memory information indicating the memory space in which the replication target data 9 included in the received notification is stored in the storage device 11 as the replication target memory information 12 (step B111). The replication target memory information 12 includes, for example, address information indicating the replication target memory space 506. The copy target memory information 12 may include identification information for identifying the application 5 or a service provided by the application 5.

  Finally, the replication processing unit 8 stands by in preparation for receiving the switching instruction (step B112).

  The above is the operation in advance preparation. The operation in advance preparation may be performed a plurality of times at an arbitrary timing. For example, the replication target notification unit 7 may perform the preliminary operation again at the timing when the replication target data 9 is increased or decreased after performing the preliminary operation when the service is started.

  Next, the operation in memory replication will be described with reference to FIG. FIG. 3 is a flowchart showing the memory replication operation performed by the active system device 1 and the standby system device 21 in the first embodiment.

  At the time of starting the memory replication operation, the active device 1 is in a state where the preliminary preparation has been completed. That is, the replication processing unit 8 is in a standby state.

  Further, the standby apparatus 21 may be in the state shown in FIG. 1 at least before the memory replication operation is started. That is, at least the host OS 22 and the recovery processing unit 27 may be operating in the standby system 21 before the start of the memory replication operation. Note that the guest OS 24 and the application 25 in the standby apparatus 21 may be operating before the start of the memory replication operation.

  First, the switching instruction 30 is transmitted to the active system device 1 from any process operating in the active system device 1 or an external device (not shown). In the active device 1, the replication processing unit 8 receives the switching instruction 30 (step B200). The switching instruction 30 can be transmitted when a service provider is to be switched to the standby system device 21 when, for example, a failure occurs in the service provided by the application 5 or before maintenance work of the active system device 1 is performed. .

  When the replication processing unit 8 receives the switching instruction 30, the replication processing unit 8 acquires the replication target memory information 12 stored at the time of preparation from the storage device 11 (step B201).

  Next, the replication processing unit 8 reads the replication target data 9 from the main storage device 6 based on the acquired replication target memory information 12 (step B202).

  Next, the replication processing unit 8 transfers the read replication target data 9 to the standby system device 21 (step B203). For example, the replication processing unit 8 may select the standby device 21 by inquiring a server that manages the system configuration to an external device (not shown) about the switching destination. Alternatively, the replication processing unit 8 may select the standby system device 21 based on the replication destination information included in the switching instruction 30, for example.

  Note that the replication processing unit 8 may execute (instruct) the process of stopping the operation of the application 5 or the guest OS 4 at any timing after Step B200.

  Next, in the standby system 21, the recovery processing unit 27 receives the replication target data 9 transferred from the replication processing unit 8 (step C210).

  Next, the recovery processing unit 27 copies (overwrites) the received replication target data 9 to a memory space in the main storage device 26 corresponding to “the replication target memory space 506 (FIG. 4)”. (Step C211).

  When executing step C211, the main storage device 26, like the memory space of the main storage device 6 in the active device 1, corresponds to the memory space 506 to be copied used by the application in FIG. It shall have. That is, it is assumed that the guest OS 24 and the application 25 are operating in the standby apparatus 21 before executing Step C211. When the guest OS 24 and the application 25 are not operating, the recovery processing unit 27 may start (instruct) the guest OS 24 and the application 25 before executing Step C211. Note that the main storage device 26 may have a memory space used for purposes other than those shown in FIG. Further, the main storage device 26 has a memory space corresponding to each of the memory spaces 502 to 506 shown in FIG. 4, and includes attributes such as the absolute address of each memory space and the size of each memory space. Is not necessarily consistent with FIG.

  Finally, the recovery processing unit 27 instructs the guest OS 24 or the application 25 to recover the service (step C212). In response to this instruction, the application 25 resumes (takes over) the service on behalf of the application 5 based on the replication target data 9 copied to the main storage device 26.

  As described above, according to the present embodiment, after receiving the switching instruction 30, by performing memory synchronization (data transfer) from the active system device 1 to the standby system device 21, service to the standby system device 21 is performed. Can be taken over.

  As described above, the present embodiment has the effect that the amount of spare resources required for memory synchronization is small during standby until the switching of the service (processing) from the active system device 1 to the standby system device 21 occurs. There is.

  The reason is that in the active device 1, when the replication processing unit 8 receives the switching instruction 30, memory synchronization is performed by transferring the replication target data 9 to the standby device 21. Then, in the standby system 21, the restoration processing unit 27 gives the transferred replication target data 9 to the application 25 via the main storage device 26, so that the service is taken over. That is, according to the present embodiment, the memory synchronization from the active system device 1 to the standby system device 21 is not performed while waiting for the switching to be generated by the switching instruction 30. Therefore, this embodiment has an effect that the amount of resources such as a storage device and a communication band in the standby system 21 required for memory synchronization can be reduced.

  In this embodiment, the replication processing unit 8 stores the replication target memory information 12 in the storage device 11, but stores the replication target memory information 12 in a specific memory space of the main storage device 6 as described above. Also good.

<Second Embodiment>
Next, a second embodiment based on the above-described first embodiment will be described. Below, it demonstrates centering on the characteristic part which concerns on 2nd Embodiment. Constituent elements of the second embodiment having the same configurations as those of the first embodiment are denoted by the same reference numerals as the reference numerals used in the first embodiment, and detailed description overlapping those constituent elements. Is omitted.

  FIG. 5 is a block diagram showing a configuration of an information processing system according to the second embodiment of the present invention. The present embodiment is different from the first embodiment described above in that the first information processing apparatus (active system apparatus) 100 includes a state management unit 101 that detects an abnormality of each unit of the virtual machine 3 that provides the service. . That is, in this embodiment, the state management unit 101 transmits a switching instruction 30 to the replication processing unit 8 when detecting an abnormality.

  First, the configuration of the present embodiment will be described below with reference to FIG.

  Referring to FIG. 5, the information processing system according to the present embodiment includes a first information processing device 100 (hereinafter referred to as “active system device 100”), a storage device 11, and a standby system device 21. The present embodiment is an information processing system that enables the standby system device 21 to take over the service provided by the active system device 100 when an abnormality that affects the service provided by the active system device 100 occurs. is there.

  Since the storage device 11 and the standby system device 21 are the same as those in the first embodiment, a detailed description thereof will be omitted. The active system device 100 corresponds to the active system device 1 in the first embodiment. Hereinafter, the difference between the active system device 100 and the active system device 1 in the first embodiment will be described.

  Similarly to the first embodiment, the active system device 100 and the standby system device 21 can communicate with each other via a network 1000 such as the Internet or a local area LAN. The active system apparatus 100 may be configured by a general information processing apparatus (computer) that operates under the control of a computer program (software program) that is executed using a CPU (not shown). Alternatively, each unit of the active system device 100 may be configured by a dedicated hardware device or a logic circuit. A hardware configuration example in which the active device 100 is realized by a computer will be described later with reference to FIG.

  The active system 100 includes a host OS 2, a virtual machine 3, a main storage device 6, a replication processing unit 8, and a state management unit 101. Since the configurations and functions of the host OS 2, the virtual machine 3, the main storage device 6, and the replication processing unit 8 are the same as those in the first embodiment, duplicate descriptions are omitted.

  The state management unit 101 operates on the host OS 2. The state management unit 101 detects an abnormal operation by monitoring operations such as services provided by the guest OS 4 and the application 5 as monitoring targets. That is, the state management unit 101 monitors function units that may affect the continuity of the service provided by the application 5. The monitoring target may include hardware included in the active system device 100 and the storage device 11, and the host OS 2.

  As a technique for monitoring by the state management unit 101, a well-known general technique such as a method of monitoring by a watch dog mechanism or the like can be employed. Alternatively, for example, the monitoring target such as the guest OS 4 may constantly (periodically) notify the state management unit 101 of its own operation status. When the state management unit 101 detects that an abnormality has occurred in the monitoring target, the state management unit 101 transmits the switching instruction 30 in the first embodiment to the replication processing unit 8.

  Next, the operation of the present embodiment having the above-described configuration will be described in detail. As in the first embodiment, the operation of the information processing system according to the present embodiment is configured by two-stage operations including advance preparation and memory replication.

  Since the preparatory operation in the present embodiment is the same as that in the first embodiment, a detailed description thereof is omitted. Note that, in the preliminary preparation stage, the state management unit 101 does not need to operate in particular.

  After the preparation is completed, the state management unit 101 performs monitoring. Similarly to the replication processing unit 8, the state management unit 101 may be activated in advance. Alternatively, the state management unit 101 may be activated when the replication processing unit 8 enters a standby state.

  When the state management unit 101 detects that an abnormality has occurred in a monitoring target such as a service provided by the guest OS 4 or the application 5 during execution of monitoring, the state management unit 101 transmits a switching instruction 30 to the replication processing unit 8. To do.

  The subsequent operation is the same as the memory replication operation in the first embodiment. That is, the replication processing unit 8 receives the switching instruction transmitted from the state management unit 101 (step B200 in FIG. 3). Finally, in the standby system apparatus 21, the application 25 resumes the service (step C212 in FIG. 3).

  As described above, in addition to the same effects as those of the first embodiment described above, the present embodiment further takes over the service from the active device 100 to the standby device 21, and the state management unit 101. This also has the effect of being able to execute autonomously triggered by detecting an abnormal operation.

  This is because the state management unit 101 autonomously transmits the switching instruction 30 when an abnormality occurs in the monitoring target that may affect the continuity of the service provided by the application 5. This is because the replication processing unit 8 links the replication operation when the switching instruction 30 is received.

  The status management unit 101 may be in the standby system device 21 or an external device (not shown).

<Third Embodiment>
Next, a third embodiment based on the first or second embodiment described above will be described. Below, it demonstrates centering on the characteristic part which concerns on 3rd Embodiment. The same reference numerals as those used in the first or second embodiment are attached to the constituent elements of the third embodiment having the same configuration as that of the above-described embodiment, and the details of the constituent elements are duplicated. The detailed explanation is omitted.

  FIG. 6 is a block diagram showing a configuration of an information processing system according to the third embodiment of the present invention. In the present embodiment, the service can be taken over after processing of the entire information processing apparatus (active system apparatus) 200 (hereinafter referred to as “active system apparatus 200”) cannot be continued due to an abnormality in the host OS 4 itself. The point which has the boot process part 201 differs from embodiment mentioned above. Further, in the present embodiment, the state management unit 221 is disposed in the second information processing apparatus (standby system apparatus) 220 and is operated from the second information processing apparatus 220 (hereinafter referred to as “standby system apparatus 220”). Another difference is that each unit including the host OS 4 of the system device 200 is monitored. Furthermore, the storage device that stores the replication target memory information 12 is also a nonvolatile storage device 210.

  First, the configuration of the present embodiment will be described below with reference to FIG.

  Referring to FIG. 6, the information processing system according to this embodiment includes an active device 200, a nonvolatile storage device 210, and a standby device 220. The present embodiment is an information processing system that enables the standby system device 220 to take over the service provided by the active system device 200 when an abnormality that affects the service provided by the active system device 200 occurs. is there.

  The active system device 200 and the standby system device 220 can communicate with each other via a network 1000 such as the Internet or a local area LAN, as in the above-described embodiment. The active system apparatus 200 and the standby system apparatus 220 are configured by a general information processing apparatus (computer) that operates under the control of a computer program (software program) that is executed using a CPU (not shown). Also good. Alternatively, each unit of the active system device 200 and the standby system device 220 may be configured by a dedicated hardware device or a logic circuit. A hardware configuration example in which the active system device 200 and the standby system device 220 are realized by a computer will be described later with reference to FIG.

  The nonvolatile storage device 210 corresponds to the storage device 11 in the first and second embodiments. In the present embodiment, the nonvolatile storage device 210 is different from the storage device 11 in that the nonvolatile storage device 210 is realized by a nonvolatile storage device such as an HDD (hard disk drive). The other configurations and functions of the nonvolatile memory device 210 are the same as those in the first and second embodiments, and thus the duplicate description is omitted.

  The active system apparatus 200 is based on the active system apparatus 1 in the first embodiment. The active device 200 includes a host OS 2, a virtual machine 3, a main storage device 6, and a replication processing unit 8.

  The function and configuration of the replication processing unit 8 are the same as those in the first and second embodiments except that the storage destination of the replication target memory information 12 is the nonvolatile storage device 210. A duplicate description in the replication processing unit 8 is omitted.

  The host OS 2 has a boot processing unit 201. Other configurations and functions of the host OS 2 are the same as those in the first embodiment, and a duplicate description is omitted.

  The boot processing unit 201 confirms the result of the previous termination process (the process at the time of shutdown) when the active system device 200 is activated, and performs the startup process including the initialization process of the main storage device 6 according to the result. be able to.

  If it was not completed normally (abnormal) last time, the boot processing unit 201 performs a startup process in “replication mode”. In the replication mode, first, the boot processing unit 201 specifies the position of the replication target data 9 remaining in the main storage device 6 based on the replication target memory information 12 stored in the nonvolatile storage device 210. Then, the boot processing unit 201 protects the replication target data 9. Further, the boot processing unit 201 transmits a switching instruction 30 to the replication processing unit 8 that is newly started after the active system device 200 is restarted. In the case of normal termination last time, the boot processing unit 201 performs a startup process that is generally performed by an information processing apparatus in the virtualization system. That is, the boot processing unit 201 performs the startup process without protecting the replication target data 9 remaining in the main storage device 6.

  Since the configurations and functions of the virtual machine 3 and the main storage device 6 are the same as those in the first embodiment, duplicate descriptions are omitted.

  The standby system device 220 includes a host OS 22, a virtual machine 23, a main storage device 26, a recovery processing unit 27, and a state management unit 221. Since the configurations and functions of the host OS 22, the virtual machine 23, the main storage device 26, and the recovery processing unit 27 are the same as those in the first and second embodiments, redundant descriptions are omitted.

  The state management unit 221 is based on the state management unit 101 in the second embodiment. In other words, it can be said that the state management unit 221 has arranged the state management unit 101 arranged in the active system device 100 in the standby system device 220 in the second embodiment. The state management unit 221 monitors the operation of the services provided by the host OS 2, guest OS 4, and application 25 of the active system device 200 from the standby system device 220 via the network 1000 as monitoring targets. As a technique for the state management unit 221 to perform monitoring, a well-known general technique can be adopted as in the second embodiment.

  When the state management unit 221 detects that an abnormality has occurred in the monitoring target, the state management unit 221 can transmit the switching instruction 30 to the active device 200. In addition, the state management unit 221 executes restart of the active device 200 when there is a possibility that the processing for the switching instruction 30 in the active device 200 is not performed, such as when an abnormality of the host OS 2 is detected (instruction). May be. Since the state management unit 221 can employ a well-known general technique for restarting the active device 200 connected via the network 1000, a detailed description thereof will be given here. Omitted.

  Next, the operation of the present embodiment having the above-described configuration will be described in detail. As in the second embodiment, the operation of the information processing system according to the present embodiment is configured by a two-stage operation including advance preparation and memory replication including monitoring.

  Since the preparatory operation in the present embodiment is the same as that in the first embodiment, a detailed description thereof is omitted. Note that the boot processing unit 201 does not need to operate particularly in the preliminary preparation stage. After the preparation is completed, the replication target memory information 12 is stored in the nonvolatile storage device 210. Further, in the standby system apparatus 220, the state management unit 221 is monitoring the active system apparatus 200.

  Next, an operation performed by the information processing system according to the present embodiment when an abnormality occurs in the active apparatus 200 during the monitoring by the state management unit 221 after the preparation is completed will be described. In the following, as one specific example in which the effect of the present embodiment is clearly expressed, an operation in the case where an abnormality that makes it impossible to continue processing occurs in the host OS 2 in the active system apparatus 200 will be described.

  First, an abnormality occurs in the host OS 2 in the active device 200 while the state management unit 221 is executing monitoring. Then, the state management unit 221 detects an abnormality in the host OS 2 and restarts the active system device 200. At this time, in this embodiment, when the active device 200 is restarted, the boot processing operation performed by the boot processing unit 201 is first executed before the replication operation. The operation of the boot processing unit 201 in the boot process will be described below with reference to FIG. FIG. 7 is a flowchart illustrating an operation performed by the boot processing unit 201 in the third embodiment.

  When the active system device 200 is restarted in a state where an abnormality has occurred in the host OS 2, the active system device 200 ends without performing the termination process normally, and then restarts again. At the time of restart, first, the boot processing unit 201 operates in the active system device 200. The boot processing unit 201 confirms the result of the previous end process (step D300). For example, the boot processing unit 201 can determine the normality of the previous end process by checking the state of the file or registry to be updated by the end process.

  When the previous termination process is abnormal, the boot processing unit 201 performs the startup process in the “replication mode”. For example, the boot processing unit 201 excludes the memory space used by other than the host OS 2 and performs memory initialization for the main storage device 6 (step D301). That is, the boot processing unit 201 excludes the memory spaces (504 to 506 in FIG. 4) used by the guest OS 4 and the application 5 before restarting from initialization.

  Next, the boot processing unit 201 acquires the replication target memory information 12 from the nonvolatile storage device 210 (step D302).

  Next, the boot processing unit 201 protects the replication target data 9 in the main storage device 6 based on the acquired replication target memory information 12 (step D303). For example, the boot processing unit 201 may prohibit overwriting the memory space in which the replication target data 9 is stored, using a memory management function provided by the host OS 2.

  Next, the boot processing unit 201 activates the replication processing unit 8 (step D304).

  Finally, the boot processing unit 201 transmits a switching instruction 30 to the activated replication processing unit 8 (step D305).

  The subsequent operation is the same as the memory replication operation (FIG. 3) in the first embodiment, and thus a detailed description thereof is omitted. After the memory replication operation, finally, the application 25 resumes the service in the standby apparatus 21 (step C212 in FIG. 3).

  Note that at any point after step D301, the boot processing unit 201 notifies the host OS 2 that it has started in the replication mode so that the host OS 2 does not start the guest OS 4 and the application 5. Good.

  As described above, in this embodiment, in addition to the same effects as those of the first and second embodiments described above, the replication processing unit 8 cannot process the switching instruction 30 due to an abnormality of the host OS 2 or the like. Also in this case, there is an effect that it is possible to take over the service to the standby system device 21 after the active system device 200 is restarted.

  The reason is that the boot processing unit 201 protects the replication target data 9 stored before the restart when the previous end process is not normal in the start process. In addition, the nonvolatile storage device 210 can retain the replication target memory information 12 even when the active system device 200 is restarted. As a result, the replication processing unit 8 that operates after the active device 200 is restarted can execute memory replication to the standby device 21 using the protected replication target data 9 before the restart. .

  In step D300, when the previous end process is normal, the boot processing unit 201 performs normal memory initialization (step D310). That is, the boot processing unit 201 performs memory initialization for the main storage device 6 without protecting the replication target data 9 remaining in the main storage device 6. Further, the boot processing unit 201 may perform other startup processing.

  A part of the processing performed by the boot processing unit 201 described above may be realized by a function of the host OS 2 other than the boot processing unit 201. For example, activation of the replication processing unit 8 and subsequent transmission of the switching instruction 30 may be executed via the host OS 2.

  Further, the range of memory initialization executed by the boot processing unit 201 and the method for protecting the replication target data 9 can be realized by methods other than those exemplified in steps D301 to D303.

<Fourth Embodiment>
Next, a concept common to the above-described embodiments will be described.

  FIG. 8 is a block diagram showing a configuration of an information processing system according to the fourth embodiment of the present invention.

  Referring to FIG. 8, the present embodiment includes a first information processing apparatus (active system apparatus) 300, a storage device 311, and a second information processing apparatus (standby system apparatus) 320. In the present embodiment, when the switching instruction 30 is received, a service (processing) provided by the first information processing apparatus 300 (hereinafter referred to as “active system apparatus 300”) is transferred to the second information processing apparatus 320 (hereinafter referred to as “processing apparatus 300”). , An information processing system that enables the “standby system device 320” to take over.

  The switching instruction 30 is information for instructing to perform (switch) the service provided by the active system apparatus 1 in another standby system apparatus.

  The active system apparatus 300 and the standby system apparatus 320 can communicate with each other via a network 1000 such as the Internet or a local area LAN. The active system apparatus 300 and the standby system apparatus 320 are general information processing apparatuses (computers) that operate under the control of a computer program (software program) that is executed using a CPU (Central Processing Unit: not shown). It may be constituted by. Alternatively, each unit of the active system device 300 and the standby system device 320 may be configured by a dedicated hardware device or a logic circuit. A hardware configuration example in which the active system device 300 and the standby system device 320 are realized by a computer will be described later with reference to FIG.

  The storage device 311 is a storage device that can be used by the active system device 300. In the present embodiment, the storage device 311 is connected to the active system device 300. Note that the storage device 311 may be built in the active system device 300. The storage device 311 may be a non-volatile storage device such as an HDD (hard disk drive). Further, the storage device 311 is not necessarily a separate storage device from the storage device 306. The storage device 311 corresponds to the storage device 11 in the first and second embodiments and the nonvolatile storage device 210 in the third embodiment.

  The active device 300 includes an application 305, a storage device 306, and a replication processing unit 308. The application 305 corresponds to the application 5 in the first to third embodiments. The storage device 306 corresponds to the main storage device 6 in the first to third embodiments. The replication processing unit 308 corresponds to the replication processing unit 8 in the first to third embodiments.

  The application 305 is a main body that provides a service in the active device 300. The service taken over by the standby system 320 described above is a service provided by the application 305. The application 305 includes a copy target notification unit 307.

  The replication target notification unit 307 notifies the replication processing unit 308 described later of memory information indicating a memory space in which the replication target data 309 is stored. The replication target data 309 is information necessary for the application 325 taking over the processing (service) executed by the application 305 to restore the service. The replication target notification unit 307 corresponds to the replication target notification unit 7 in the first to third embodiments. The replication target data 309 corresponds to the replication target data 9 in the first to third embodiments.

  The storage device 306 can store replication target data 309 generated according to the operation of the application 305. The storage device 306 is realized by, for example, a semiconductor memory device or a disk device.

  First, when receiving a notification indicating memory information from the replication target notification unit 307 as an operation in advance preparation, the replication processing unit 308 stores the notified memory information as replication target memory information 312 in the storage device 311. Thereafter, the replication processing unit 308 waits for reception of the switching instruction 30. The switching instruction 30 is transmitted to the replication processing unit 308 when the service provider is to be switched from the active device 300 to the standby device 320. The replication target memory information 312 corresponds to the replication target memory information 12 in the first to third embodiments.

  When receiving the switching instruction 30, the replication processing unit 308 reads the replication target data 309 based on the stored replication target memory information 312 as a transfer process in the memory replication operation. Then, the replication processing unit 308 transfers the read replication target data 309 to the standby system device 320.

  The standby system device 320 includes an application 325 and a recovery processing unit 327. The application 325 corresponds to the application 25 in the first to third embodiments. The recovery processing unit 327 corresponds to the recovery processing unit 27 in the first to third embodiments.

  When receiving the replication target data 309 transferred from the replication processing unit 308 in the active apparatus 300, the recovery processing unit 327 instructs the application 325 to recover the service based on the replication target data 309.

  The application 325 can provide the same service as the application 305 in the active apparatus 300. In response to the instruction from the recovery processing unit 327, the application 325 recovers the service provided by the application 305 based on the replication target data 309.

As described above, as a result of the memory replication operation by the replication processing unit 308, the application 325 can take over the service in the standby device 320 based on the replication target data 309 sent from the replication processing unit 308. As described above, in the present embodiment, which represents a concept common to the above-described embodiments, the memory synchronization is performed in the standby state until the handover of the processing from the active device 300 to the standby device 305 occurs. There is an effect that the amount of spare resources required is small.

  The reason is that in the active device 300, when the replication processing unit 308 receives the switching instruction 30, memory synchronization is performed by transferring the replication target data 309 to the standby device 320. In the standby system 320, the recovery processing unit 327 allows the application 25 to take over the service based on the transferred replication target data 309. That is, according to the present embodiment, the memory synchronization from the active system device 300 to the standby system device 320 is not performed while waiting for the switching to occur according to the switching instruction 30. Therefore, the present embodiment has an effect that the amount of resources such as a storage device and a communication band in the standby apparatus 320 required for memory synchronization can be reduced.

[Modification]
Further, as a modification of each of the above-described embodiments, the information processing system according to each embodiment includes a single standby system device 21, 220, a plurality of active system devices 1, 100, 200, or 300. Alternatively, 320 may be included. For example, the recovery processing unit 27 selects the application 25 that takes over the service in accordance with the transmission source (the active device 1) of the received replication target data. In this case, the recovery processing unit 27 holds in advance information that associates, for example, an address indicating a transmission source and the application 25 corresponding to the service provided by each active device. Thereby, one standby system apparatus can cope with service takeover in a plurality of active system apparatuses. Therefore, such a modification has the effect of further reducing the amount of spare resources required for memory synchronization.

  Further, in each of the embodiments described above, there is one guest OS in the active system device and the standby system device, but this embodiment is also applicable when each device has a plurality of guest OSs.

  1, 5, 6, and 8 in each of the above-described embodiments may be configured by independent hardware circuits, or a function (processing) unit of software program ( Software module). However, the division of each part shown in these drawings is a configuration for convenience of explanation, and various configurations can be assumed for mounting.

  An example of the hardware environment in such a case will be described with reference to FIG. FIG. 9 is a diagram illustrating a configuration of a computer (information processing apparatus) applicable to the information processing system according to each embodiment of the present invention. That is, FIG. 9 shows the first information processing devices (active system devices) 1, 100, 200, and 300, and the second information processing devices (standby system devices) 21, 220, and the respective embodiments described above. A hardware configuration capable of realizing each function in each of the above-described embodiments, which is a configuration of a computer capable of realizing at least one of 320.

  9 includes a CPU (Central Processing Unit) 901, a ROM (Read Only Memory) 902, a RAM (Random Access Memory) 903, a communication interface (I / F) 904, a display 905, and a hard disk device (HDD). ) 906, and these are connected via a bus 907. When the computer shown in FIG. 9 functions as the information processing devices (active devices) 1, 100, 200, and 300 and the information processing devices (standby devices) 21, 220, and 320, the display 905 is always provided. There is no need to be done. The communication interface 904 is a general communication unit that realizes communication between the computers in each of the above-described embodiments. The hard disk device 906 stores a program group 906A and various storage information 906B. The program group 906A is, for example, a computer program for realizing a function corresponding to each block (each unit) shown in FIG. 1, FIG. 5, FIG. 6, and FIG. The various storage information 906B is, for example, the replication target data 9 and 309 shown in FIGS. 1, 5, 6, and 8, and the replication target memory information 12 and 312. In such a hardware configuration, the CPU 901 governs the overall operation of the computer 900.

  The present invention described by taking each of the above embodiments as an example is a block diagram (FIGS. 1, 5, 6, and 8) or a flowchart (FIGS. 1, 2, and 8) referred to in the description of each embodiment. This is achieved by supplying a computer program capable of realizing the functions of FIG. 7) and then reading the computer program to the CPU 901 of the hardware and executing it. The computer program supplied to the computer may be stored in a non-volatile storage device (storage medium) such as a readable / writable temporary storage memory 903 or a hard disk device 906.

  In the above-described case, the computer program can be supplied to each device by a method of installing in the device via various recording media such as a floppy disk (registered trademark) and CD-ROM, the Internet, etc. Currently, a general procedure can be employed, such as a method of downloading from the outside via the communication network 1000. In such a case, the present invention can be understood to be configured by a computer-readable storage medium in which the code constituting the computer program or the code is recorded.

  Note that a part or all of the above-described embodiment can be described as the following supplementary notes, but is not limited to the following supplementary notes.

(Appendix 1)
A replication target notification unit for notifying memory information indicating a memory space in which replication target data, which is information necessary for recovery of the service provided by the first application, is stored;
When the memory information notified from the replication target notification unit is stored as replication target memory information in a predetermined storage device, and when receiving a switching instruction that instructs the other information processing device to implement the service, A replication processing unit that reads the replication target data based on the replication target memory information stored in a predetermined storage device, and transfers the read replication target data to a second information processing device; Information processing device.

(Appendix 2)
For the second application that receives the replication target data that is information necessary for restoration of the service provided by the first application that operates in the first information processing apparatus according to appendix 1, and that can provide the service, A second information processing apparatus including a restoration processing unit that restores the service based on the replication target data.

(Appendix 3)
The monitoring target that may affect the continuity of the service performed by the first application is monitored, and when it is detected that an abnormality has occurred in the monitoring target, the switching instruction is sent to the replication processing unit. The first information processing apparatus according to appendix 1, further comprising a state management unit for transmission.

(Appendix 4)
When the monitoring target that may affect the continuity of the service performed by the first application is monitored and it is detected that an abnormality has occurred in the monitoring target, the first information processing apparatus according to appendix 1 The second information processing apparatus according to supplementary note 2, further comprising: a state management unit that transmits a switching instruction instructing the other information processing apparatus to execute the service.

(Appendix 5)
The replication processing unit stores the replication target memory information in a nonvolatile storage device when storing the replication target memory information,
In addition, it has a boot processing unit,
The boot processing unit confirms the result of the previous end process in the apparatus at the time of starting the apparatus, and if the normal end has not been completed last time, specifies the position based on the replication target memory information The first information processing apparatus according to supplementary note 1 or supplementary note 3, which protects replication target data and transmits the switching instruction to a replication processing unit that is newly activated after the activation of the apparatus.

(Appendix 6)
The first information processing apparatus according to any one of Supplementary Note 1, Supplementary Note 3, or Supplementary Note 5,
An information processing system comprising: the second information processing device according to supplementary note 2 or supplementary note 4 that receives the replication target data from the first information processing device.

(Appendix 7)
Using the first information processing device,
Executing pre-preparation processing for storing memory information indicating a memory space in which data to be replicated, which is information necessary for restoration of a service provided by the first application, is stored as data to be replicated in a predetermined storage device;
When the switching instruction instructing the other information processing apparatus to execute the service is received, the replication target data read based on the replication target memory information stored in the predetermined storage device is the second information. Execute transfer processing to transfer to the processing device,
Using the second information processing apparatus,
Receiving the replication target data;
A memory replication method for recovering the service based on the replication target data for a second application that can provide the service.

(Appendix 8)
After the preparation process,
Monitoring a monitoring target that may affect continuity of the service performed by the first application;
The memory replication method according to claim 7, further comprising a process of transmitting the switching instruction to the first information processing apparatus when it is detected that an abnormality has occurred in the monitoring target.

(Appendix 9)
In the preparation process, the replication target memory information is stored in a predetermined nonvolatile storage device,
Confirming the result of the previous end processing in the first information processing apparatus at the time of starting the first information processing apparatus executed thereafter,
In the case where the previous normal end was not completed, the replication target data whose location was specified based on the replication target memory information was protected,
The memory replication method according to appendix 7 or appendix 8, wherein the transfer process is executed after the first information processing apparatus is activated.

(Appendix 10)
A replication target notification process for notifying memory information indicating a memory space in which the replication target data, which is information necessary for recovery of the service provided by the first application, is stored;
When the memory information notified by the duplication target process is stored as duplication target memory information in a predetermined storage device and a switching instruction instructing to execute the service in another information processing device is received, the predetermined information A replication process for reading the replication target data based on the replication target memory information stored in the storage device and transferring the read replication target data to a second information processing apparatus. 1 computer program.

(Appendix 11)
A second data that can be provided from the information processing apparatus that executes the first computer program according to attachment 10 by receiving data to be copied, which is information necessary for restoration of the service provided by the first application, and providing the service. A second computer program for causing an application to execute a restoration process for restoring the service based on the data to be replicated.

(Appendix 12)
The monitoring target that may affect the continuity of the service provided by the first application is monitored, and when it is detected that an abnormality has occurred in the monitoring target, the first computer program according to appendix 10 is executed. A third computer program that causes a computer to execute a state management process for transmitting a switching instruction that instructs the information processing apparatus to perform the service in another information processing apparatus.

(Appendix 13)
The first computer program according to claim 10, wherein the replication target memory information is stored in a predetermined nonvolatile storage device in the replication process.

(Appendix 14)
A fourth computer program for controlling the operation of the information processing apparatus that executes the first computer program according to attachment 13, wherein the fourth computer program
A confirmation process for confirming the result of the previous termination process in the apparatus when the apparatus is started;
If the previous normal termination was not completed, a data protection process for protecting the replication target data whose position is specified based on the replication target memory information;
A fourth computer program that transmits the switching instruction to the first computer program according to Supplementary Note 13 that is newly started after the apparatus is started.

1, 100, 200, 300 First information processing apparatus (active system apparatus)
2, 22 Host OS
3, 23 Virtual machine 4, 24 Guest OS
5, 25, 305, 325 Application 6, 26 Main storage device 7, 307 Replication target notification unit 8, 308 Replication processing unit 9, 309 Replication target data 11, 311 Storage device 12, 312 Replication target memory information 21, 220, 320 Second information processing apparatus (standby system apparatus)
27, 327 Recovery processing unit 30 Switching instruction 101, 221 State management unit 201 Boot processing unit 210 Non-volatile storage device 306 Storage device 501 Memory space of main storage device 502 Memory space used by host OS 503 Used by functional units related to replication Memory space 504 Memory space used by guest OS 900 Information processing device (computer)
901 CPU
902 ROM
903 RAM
904 Communication interface (I / F)
905 Display 906 Hard disk device (HDD)
906A Program group 906B Various stored information 907 Bus 1000 Network (communication network)

Claims (10)

Including a storage device for storing a copy target, an active device, and a standby device,
The active system device is:
A replication processing unit operating on a host operating system (host OS);
A virtual machine operating on the host OS and including a guest operating system (guest OS) and applications;
A part used by the host OS, a part used by the replication processing unit, a part used by the guest OS, a part used by the application, a part not to be copied, and a part used by the application A main storage device including a portion to be duplicated,
The application will have a replication target notification unit for notifying the memory space information object parts of replication in a portion where the application uses is stored,
If the replication processing unit, the memory space information notified from the replication target notification unit, and stored in the storage device, receives a switching instruction for instructing to implement the services in the standby system device, said storage device An information processing apparatus that reads out a part to be duplicated in a part used by the application based on the memory space information stored in the information, and transfers the read part to the standby apparatus. The standby device receives a portion to be replicated in a portion used by the application, and is based on a portion to be replicated in a portion used by the application with respect to the application operating on the standby device. 2. The information processing apparatus according to claim 1, further comprising a restoration processing unit that restores the service on the standby system apparatus.   The information processing apparatus according to claim 1, further comprising: a state management unit that monitors the virtual machine and transmits the switching instruction to the replication processing unit when it detects that an abnormality has occurred in the virtual machine. . The standby device monitors the services provided by the host OS, guest OS, and application of the active device, and when detecting that an abnormality has occurred, instructs the standby device to restart the active device. A second state management unit,
The active system device includes a boot processing unit,
The boot processing unit confirms the result of the previous termination process in the active system device when the active system device is restarted. Initialize by excluding the part to be used,
The part used by the application whose position is specified based on the memory space information is protected, and the part to be copied is protected, and the switching instruction is sent to the replication processing unit that is newly started after the active device is started To
The information processing apparatus according to claim 1 or 2. A storage device that stores the replication target and an active device connected to the standby device,
A part used by a host operating system (host OS), a part used by a replication process, a part used by a guest operating system (guest OS), a part used by an application and a part not to be replicated, and the application And a main storage device including a portion to be duplicated in a portion used by
The active device operates the replication process that operates on the host OS, and the virtual machine that operates on the host OS and includes the guest OS and the application,
The application notifies the memory space information object parts of replication in a portion where the application uses is stored,
The replication processing stores the memory space information in the storage device, and when receiving a switching instruction instructing to execute a service in the standby system device, based on the memory space information stored in the storage device An information processing method of reading a portion to be copied in a portion used by the application and transferring the portion to the standby apparatus. The standby device receives a portion to be replicated in a portion used by the application, and is based on a portion to be replicated in a portion used by the application with respect to the application operating on the standby device. 6. The information processing method according to claim 5 , wherein the service is restored on the standby apparatus.   The information processing method according to claim 5 or 6, wherein the virtual machine is monitored, and when the abnormality is detected in the virtual machine, the switching instruction is transmitted to the replication process. The standby device monitors the services provided by the host OS, guest OS, and application of the active device and, when detecting that an abnormality has occurred, instructs the standby device to restart,
The active device is
When the active device is restarted, the result of the previous termination process in the active device is confirmed. If the previous normal termination has not been completed, the part other than the host OS of the main storage device is excluded. Initialize
The portion used for the application whose location is specified based on the memory space information is used to protect the portion to be copied, and the switching instruction is transmitted to the replication processing newly started after the active device is started. The information processing method according to claim 5 or 6. Connect to the storage device that stores the replication target and the standby system device,
And portions host operating system (host OS) is used, a part replication processing is used, a portion guest operating systems (guest OS) are used, and not the target portion of the replicated in part that the application uses, the An active system device having a main storage device including a portion to be copied by a portion used by an application,
A function of operating the virtual machine including the guest OS and the application operating on the host OS and the replication processing operating on the host OS;
The application is a function of notifying the memory space information object parts of replication in a portion where the application uses is stored,
When the replication process receives a switching instruction that instructs to save the memory space information in the storage device and to perform a service in the standby device, based on the memory space information stored in the storage device A program that reads out a portion to be copied in a portion used by the application and operates as a function of transferring the portion to the standby apparatus.   The program according to claim 9, further comprising a function of monitoring the virtual machine and transmitting the switching instruction to the replication process when it is detected that an abnormality has occurred in the virtual machine.

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