JP2020123219A - Storage control device, storage system and backup control program - Google Patents

Abstract

To reduce the hassle of backup procedures.SOLUTION: A CM2 includes: a data pool area management part 221 that is configured so as to, when receiving the generation instruction, generate a full backup area 231a for storing the entire data of the backup source volume and a generational backup area 231b that stores differential data from the data pool area 231 generated as the backup data storage destination on the memory 23 in order to manage the backup of logical volume; and a backup control unit that is configured so as to, when receiving a backup instruction, store entire data of a logical volume in a full backup area 231a, and after the storing, store data written in the logical volume in a generational backup area 231b.SELECTED DRAWING: Figure 2

Description

The present invention relates to a storage control device and the like.

As a method of backing up a source volume in a storage device, snapshot type backup (OPC: One Point Copy) is known. OPC is to create a snapshot of data to be backed up at a predetermined time. That is, when an OPC instruction is received from a user, the storage device that executes OPC backs up the entire source volume by copying all the data of the source volume at the time of receiving the OPC instruction and storing it as a snapshot. ..

SnapOPC (Snapshot One Point Copy) and SnapOPC+ are known as extended functions of OPC. In SnapOPC+, a backup volume is created for each generation, and when the source volume is updated, the data before update (old data) at the update target location is copied to the backup volume of the corresponding generation. SnapOpc+ is also called a copy-on-write type snapshot. That is, in SnapOPC+, a generation-specific backup volume is created for each generation, and only the difference data between the generations is copied to the generation-specific backup volume.

Here, a reference example of the operation of backup control using OPC and SnapOPC+ will be described with reference to FIGS. 13A and 13B. 13A and 13B are diagrams showing reference examples of backup control operations. 13A and 13B, two source volumes (backup target volumes) A and B are backed up to a full backup volume and two generations of differential backup volumes, respectively.

As shown in FIG. 13A, when a storage device that performs backup control receives a backup volume generation instruction for the source volume A from the user, the storage device that has already created RAID (Redundant Arrays of Inexpensive Disks) has the source volume A on the copy destination side. , And a differential backup volume for two generations are generated (<1>).

When the storage device receives an instruction from the user to create a backup volume for the source volume B, the storage device creates a full backup volume and two generations of differential backup volumes for the source volume B on the copy destination side where RAID has already been created ( <2>).

When the storage device receives a full backup instruction (OPC instruction) for the source volume A from the user, the storage device starts a backup of the entire source volume A (full backup) (<3>).

Similarly, when the storage device receives a full backup instruction (OPC instruction) for the source volume B from the user, it starts backing up the entire source volume B (full backup) (<4>).

As shown in FIG. 13B, when the storage device receives a first generation backup (differential backup) instruction for the source volume A from the user after the full backup of the source volume A is completed, the storage device updates the source volume A at the update target location. Start backup of the first generation (<5>).

Then, upon receiving the write I/O request (<5.0>) from the host device, the storage device performs the following processing. Here, when the data a of the source volume A is updated to the data b, the storage device starts the SnapOPC+ session and sets the unupdated data (difference data) a at the update target location to the first generation differential backup volume. Copy (<5.1>). Then, the storage device permits writing to the source volume A and rewrites the data a of the source volume A with the data b (<5.2>). Then, the storage device returns a response to the write I/O to the host device (<5.3>).

Similarly, when the storage device receives a first generation backup (differential backup) instruction for the source volume B from the user after the full backup of the source volume B is completed, the storage device of the first generation at the update target portion of the source volume B Start backup (<6>).

Then, at the generation switching timing, when the storage device receives a second generation backup (differential backup) instruction for the source volume A from the user, the storage device starts the second generation backup at the update target portion of the source volume A (<7. >).

Similarly, at the generation switching timing, when the storage apparatus receives a second generation backup (differential backup) instruction for the source volume B from the user, it starts the second generation backup at the update target portion of the source volume B (< 8>).

JP, 2014-137711, A

However, the conventional backup control using OPC and SnapOPC+ has a problem that the backup procedure is troublesome. That is, in such a backup control, a backup volume for the source volume is generated, a full backup is started, or a generation backup is started in accordance with a user instruction, so that the backup procedure is troublesome. When there are a plurality of target source volumes, the backup procedure becomes more troublesome.

In one aspect, the present invention aims to reduce the effort of a backup procedure.

In one aspect, the storage control device disclosed in the present application, when receiving a generation instruction, manages the backup of a plurality of logical volumes, from the backup data pool area generated as the backup data storage destination, to the entire backup source volume. A pool area management unit that generates a full backup data pool area that stores data and a differential data storage pool area that stores differential data; and, when a storage instruction is received, the entire data of each of the plurality of logical volumes is And a data storage unit that stores the data written in the plurality of logical volumes in the full backup data pool area and then stores the data written in the plurality of logical volumes in the differential data storage pool area.

According to one aspect of the system disclosed in the present application, the labor of the backup procedure can be reduced.

FIG. 1 is a diagram illustrating an example of the hardware configuration of the storage device according to the embodiment. FIG. 2 is a block diagram illustrating the functional configuration of the CM included in the storage device according to the embodiment. FIG. 3 is a diagram illustrating an example of the data structure of the data pool management table according to the embodiment. FIG. 4 is a diagram illustrating an example of the data structure of the data pool generation management table according to the embodiment. FIG. 5 is a diagram illustrating an example of a full backup operation according to the embodiment. FIG. 6 is a diagram illustrating an example of a differential backup operation according to the embodiment. FIG. 7 is a diagram illustrating an example of a main flowchart of the backup control process according to the embodiment. FIG. 8 is a diagram showing an example of a flowchart of the data pool area generation processing. FIG. 9 is a diagram showing an example of a flowchart of a differential backup process when a write I/O request is issued from the host device. FIG. 10 is a diagram showing an example of various tables when the data pool area generation is completed. FIG. 11 is a diagram showing an example of various tables when the full backup is completed. FIG. 12 is a diagram showing an example of various tables after writing in the area of the backup target volume. FIG. 13A is a diagram (1) illustrating a reference example of the backup control operation. FIG. 13B is a diagram (2) illustrating a reference example of the backup control operation.

Hereinafter, embodiments of the storage control device, the storage system, and the backup control program disclosed in the present application will be described in detail with reference to the drawings. The present invention is not limited to the embodiments.

[Hardware configuration of storage device]
FIG. 1 is a diagram illustrating an example of the hardware configuration of the storage device according to the embodiment. As shown in FIG. 1, the storage device 1 is connected to the host device 9. The storage device 1 includes two sets of CMs 2 and each disk 3 connected to each CM 2. In the storage device 1 according to the embodiment, a disk (HDD: Hard Disk Drive) 3 is used as a storage device, but a storage device such as SSD (Solid State Device) may be used. The two sets of CMs 2 are an example of a storage control device. The storage device 1 is an example of a storage system.

Each CM (Controller Module) 2 manages resources in the storage device 1. The resources managed by each CM 2 are, for example, the disk 3, the CA 21, which will be described later, the memory 23, the DI 24, and the CPU 22 that performs backup control. In addition, each CM 2 performs various processes (data writing process, data updating process, data reading process, data copying process at the time of backup, etc.) on the disk 3 in response to a request from the host device 9 or another CM 2. .. Further, the CMs 2 are connected to each other by a bus and are configured to be able to access the Disk 3 managed by another CM 2.

Each disk 3 stores and stores user data, control information, and the like. In the storage device 1 according to the embodiment, the source volume 3A accessed from the host device 9 is assigned as a backup target volume to the disk 3 managed by one CM 2. Further, full backup data and generational backup data for the data of the source volume 3A are stored in a data pool area 231 of the memory 23, which will be described later, managed by the other CM 2 (see FIG. 2).

The source volume 3A may be the entire data area of the disk 3 or a partial data area of one disk 3.

Each CM 2 has a CA (Channel Adapter) 21, a CPU (Central Processing Unit) 22, a memory 23, and a DI (Disk Interface) 24.

The CA 21 controls the interface with the host device 9 and performs data communication with the host device 9.

The DI 24 controls the interface with the Disk 3 managed by the CM 2 and performs data communication with the disk 3.

The memory 23 stores user data, control data, and the like, and also temporarily stores data written from the host device 9 to the disk 3 and data read from the disk 3 to the host device 9 and other CMs 2.

Further, the memory 23 stores the tables (see FIG. 2) used when backing up the source volume as a backup target volume, and also stores the backup destination data pool area 231 (see FIG. 2).

The CPU 22 manages the memory 23, the CA 21, the DI 24, and the backup control unit 22A described later.

[Functional configuration of storage device]
Next, an example of the functional configuration of the CM 2 included in the storage device 1 according to the embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating the functional configuration of the CM included in the storage device 1 according to the embodiment. Note that the CM 2 on the left side of FIG. 2 is described as the backup source, and the CM 2 on the right side of FIG. 2 is described as the backup destination, but the CM 2 on the right side may be reversed. Further, in the CM 2 of FIG. 2, the CA 21 and the DI 24 are omitted.

As shown in FIG. 2, the CM 2 includes a CPU 22 and a memory 23. The CPU 22 includes a backup control unit 22A. The backup control unit 22A executes backup control. Further, the backup control unit 22A has a data pool area management unit 221, a full backup control unit 222, and a differential backup control unit 223. The memory 23 has a data pool management table 232 and a data pool generation management table 233.

The data pool area management unit 221 manages the data pool area on the memory 23. The data pool area management unit 221 is executed, for example, when a user issues a data pool area generation instruction.

For example, when the data pool area management unit 221 is the backup source, the data pool area management unit 221 performs the following process upon receiving a data pool area generation instruction including the identifier and capacity of the backup target volume and the number of generations to be generated. The data pool area management unit 221 calculates the required capacity of the full backup area 231a from the capacity of the backup target volume included in the data pool area generation instruction. The data pool area management unit 221 calculates the required capacity of the generational backup area 231b from the capacity of the backup target volume and the number of generations included in the data pool area generation instruction. The data pool area management unit 221 calculates the required total capacity of the data pool area 231 from the capacity of the full backup area 231a and the capacity of the generational backup area 231b. Then, the data pool area management unit 221 requests the backup destination to generate a data pool area including predetermined parameters. As an example, the predetermined parameters include the capacity of the data pool area 231, the information of the full backup area 231a, the information of the generational backup area 231b, the number of generations to be generated, the generation switching interval, the identifier of the backup target volume, and the like.

Further, when the data pool area management unit 221 is the backup destination, the data pool area management unit 221 performs the following processing upon receiving a data pool area generation request. The data pool area management unit 221 creates the entire area of the data pool area 231 in the memory 23 based on the capacity of the data pool area 231 included in the data pool area creation request. The data pool area management unit 221 creates a full backup area 231a in the data pool area 231 based on the information of the full backup area 231a included in the data pool area creation request. The data pool area management unit 221 creates the number of generational backup areas 231b in the data pool area 231 based on the information of the generational backup area 231b included in the data pool area generation request and the number of generations to be generated. To generate. Then, the data pool area management unit 221 generates a data pool management table 232 used for managing the entire data pool area 231, and a data pool generation management table 233 used for managing the generational backup area 231b. ..

Then, the data pool area management unit 221 transmits the data pool management table 232 and the data pool generation management table 233 to another CM 2 in the storage device 1 at a predetermined timing. This is because all CMs 2 share the information of the data pool area 231 of the backup executed in the storage device 1. The predetermined timing may be, for example, when the load on the CM 2 is low.

Then, the data pool area management unit 221 writes the data pool area 231 to the backup volume 3Z of the disk 3 at a predetermined timing. The predetermined timing may be, for example, when the load on the CM 2 is low.

Here, an example of the data structure of the data pool management table 232 will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of the data structure of the data pool management table according to the embodiment. The data pool management table 232 stores the backup volume number, the number of generations, the generation number in use, and the oldest generation number in association with the data pool number. In addition, the data pool management table 232 stores the full backup area address, the full backup size, the full backup destination start address, the full backup creation time, and the generation switching interval in association with the data pool number.

The data pool number is a number that uniquely identifies the data pool area 231. The data pool numbers may be assigned in order from “1” in each CM 2, or may be assigned so as not to be duplicated in all CMs 2. The backup volume number indicates the identifier of the backup target volume. The backup volume number is included in the data pool area generation request, for example.

The number of generations is the number of areas created in the backup area 231b for each generation. The number of generations is included in the data pool area generation request, for example. The in-use generation number indicates the in-use generation number when the differential backup control unit 223, which will be described later, is performing a differential backup. The oldest generation number indicates the oldest generation number.

The full backup area address indicates the head address of the full backup area 231a in the data pool area 231. The full backup size indicates the size of the full backup area 231a. The full backup destination start address indicates the start address in the full backup area 231a for each backup target volume. The full backup destination start address may be a relative position from the start of the data pool area 231 or a relative position from the start of the full backup area 231a. In the embodiment, the full backup destination start address is described as a relative position from the start of the data pool area 231.

The full backup creation time indicates the creation time when the full backup was created by the full backup control unit 222 described later. The generation switching interval is an interval at which the generation of the backup area 231b for each generation is switched. The generation switching interval is included in the data pool area generation request, for example, but may be stored in the memory 23 in advance.

Here, an example of the data structure of the data pool generation management table 233 will be described with reference to FIG. FIG. 4 is a diagram illustrating an example of the data structure of the data pool generation management table according to the embodiment. As shown in FIG. 4, the previous generation number, the next generation number, the backup volume number, the data backup time, the data backup size, and the data position are stored in association with the generation number.

The generation number indicates a managed generation number. The previous generation number indicates the generation number immediately before the managed generation number. The next-generation number indicates the generation number next to the generation number. The backup volume number indicates the identifier of the backup target volume. The data backup time indicates the time when the differential data of the backup target volume indicated by the backup volume number was backed up. The data backup size indicates the data size of the differential backup. The data position is a position in the differential backup area 231b where the differential data has been backed up in an area corresponding to the generation indicated by the generation number.

Returning to FIG. 2, the full backup control unit 222 controls OPC (full backup). The full backup control unit 222 is started when the user gives an instruction for full backup.

For example, when the backup source is the backup source, the full backup control unit 222 requests the backup destination to perform a full backup including the identifier of the volume to be backed up. The full backup control unit 222 sends all the data read from the beginning for the backup target volume to the backup destination. That is, the full backup control unit 222 makes a physical copy of all data by OPC for the backup target volume.

Further, if the full backup control unit 222 is a backup destination and accepts a full backup request, the full backup control unit 222 performs the following processing. The full backup control unit 222 writes, for the backup target volume, all the data transmitted from the backup source in the full backup area 231a of the data pool area 231. As an example, the full backup control unit 222 writes the data transmitted from the backup source for the backup target volume 3A in the corresponding area from the corresponding full backup destination start address in the full backup area 231a. The full backup destination top address corresponding to the backup target volume 3A is acquired from the data pool management table 232.

The differential backup control unit 223 controls the differential backup. The differential backup control unit 223 automatically starts when the full backup by the full backup control unit 222 is completed.

For example, the differential backup control unit 223 performs the following processing when a write I/O request (update request) is made to the data block of the backup target volume from the host device 9 when it is the backup source. The differential backup control unit 223 writes the data for which the write I/O request is made in the data block of the backup target volume. The differential backup control unit 223 sends a response to the write I/O request to the host device 9. Then, the differential backup control unit 223 sends the data block of the data written in the backup target volume to the backup destination.

Further, the differential backup control unit 223 writes the updated data block in the generational backup area 231b corresponding to the current generation when it is the backup destination. It should be noted that the generation switching by the differential backup control unit 223 may be performed, for example, at the timing when the generation switching time according to the generation switching interval stored in the data pool generation management table 233 has elapsed. Further, the generation switching by the differential backup control unit 223 may be performed at the timing when there is no free space in the generation-specific backup area 231b of the currently used generation.

[Full backup operation]
FIG. 5 is a diagram illustrating an example of a full backup operation according to the embodiment. As shown in FIG. 5, it is assumed that the data pool area management unit 221 has created the data pool area 231 based on the identifier and capacity of the backup target volume and the number of generations to be created. Here, the identifiers of the backup target volumes are A and B.

When a full backup instruction is given by the user, the full backup control unit 222 writes all data of the backup target volume A in the corresponding area from the corresponding full backup destination start address in the full backup area 231a (a.1). ). Then, the full backup control unit 222 writes all data of the backup target volume B in the corresponding area from the corresponding full backup destination head address in the full backup area 231a (a.2). After that, when the full backup is completed, the differential backup is automatically started.

[Differential backup operation]
FIG. 6 is a diagram illustrating an example of a differential backup operation according to the embodiment. As shown in FIG. 6, it is assumed that the data pool area management unit 221 has created the data pool area 231 based on the identifier and capacity of the backup target volume and the number of generations to be created. Here, it is assumed that the current generation is “1”. The identifiers of the backup target volumes are A and B.

It is assumed that the differential backup is automatically started after the full backup is completed. When there is a write I/O request (update request) for the data c of the backup target volume A from the host device 9 (b.0), the differential backup control unit 223 writes to the corresponding data block of the backup target volume A. The data c for which the I/O request is made is written (b.1). Then, the differential backup control unit 223 sends a response to the write I/O request to the host device 9 (b.2). Then, the differential backup control unit 223 stores the data block of the data c written in the backup target volume A in the generational backup area 231b1 corresponding to the current generation “1”.

Similarly, when there is a write I/O request (update request) for the data d of the backup target volume B from the host device 9, the differential backup control unit 223 writes I/O to the corresponding data block of the backup target volume B. Write the data d for which the O request was made. Then, the differential backup control unit 223 sends a response to the write I/O request to the host device 9. Then, the differential backup control unit 223 stores the data block of the data d written in the backup target volume B in the generational backup area 231b1 corresponding to the current generation "1".

As a result, the backup control process shares the backup destination with the data pool, and when the full backup instruction is received, the full backup is executed, and after the execution, the differential backup is automatically started, reducing the backup procedure. it can. Further, in the backup control process, the write response time can be shortened by backing up the data itself for which the write I/O request is made to the backup destination, instead of the copy-on-write type backup system (SnapOPC+).

[Flowchart of backup control processing]
Next, a flowchart of the backup control process according to the embodiment will be described with reference to FIGS. FIG. 7 is a diagram illustrating an example of a main flowchart of the backup control process according to the embodiment. FIG. 8 is a diagram showing an example of a flowchart of the data pool area generation processing. FIG. 9 is a diagram showing an example of a flowchart of a differential backup process when a write I/O request is issued from the host device.

As shown in FIG. 7, the data pool area management unit 221 determines whether or not there is a data pool area generation instruction from the user (step S11). When it is determined that the data pool area generation instruction has not been issued (step S11; No), the data pool area management unit 221 repeats the determination processing until the data pool area generation instruction is given.

On the other hand, if it is determined that there is a data pool area generation instruction (step S11; Yes), the data pool area management unit 221 executes a data pool area generation process (step S12). The flowchart of the data pool area generation process will be described later.

After the data pool area generation process is executed, the full backup control unit 222 determines whether or not there is a full backup instruction from the user (step S13). When it is determined that the full backup instruction has not been issued (step S13; No), the full backup control unit 222 repeats the determination process until the full backup instruction is given.

On the other hand, when it is determined that the full backup instruction has not been issued (step S13; Yes), the full backup control unit 222 executes the full backup (step S14). For example, upon receiving the full backup instruction, the backup source full backup control unit 222 requests the backup destination to perform a full backup including the identifier of the backup target volume. Upon receiving the request for full backup, the full backup control unit 222 of the full backup destination writes all the data transmitted from the backup source in the full backup area 231a of the data pool area 231 for the backup target volume.

Subsequently, when the full backup ends, the differential backup control unit 223 starts the differential backup (step S15). A flowchart of the differential backup process when there is a write I/O request after starting the differential backup will be described later.

Then, the differential backup control unit 223 determines whether or not there is a free area in the generational backup area of the current generation (step S16). When it is determined that there is no free area in the generational backup area of the current generation (step S16; Yes), the differential backup control unit 223 executes the generation switching processing of the generational backup area (step S17). For example, the backup destination differential backup control unit 223 may set the in-use generation number of the data pool management table 232 to the generation number of the next generation. Then, the differential backup control unit 223 moves to step S16.

On the other hand, when it is determined that there is a free area in the generational backup area of the current generation (step S16; No), the differential backup control unit 223 determines whether the generation switching time has elapsed (step S18). .. For example, the differential backup control unit 223 may use the generation switching interval stored in the data pool management table 232 to determine whether or not the time obtained by adding the generation switching interval to the latest generation switching time has elapsed.

When it is determined that the generation switching time has elapsed (step S18; Yes), the differential backup control unit 223 proceeds to step S17 to execute the generation switching process.

On the other hand, when it is determined that the generation switching time has not elapsed (step S18; No), the backup control unit 22A determines whether or not there is a backup end instruction (step S19). When it is determined that there is no backup end instruction (step S19; No), the differential backup control unit 223 proceeds to step S16.

On the other hand, when it is determined that the backup end instruction has been issued (step S19; Yes), the backup control unit 22A ends the backup control process.

As shown in FIG. 8, the data pool area management unit 221 receives a data pool area generation request from the backup source (step S21). For example, the backup destination data pool area management unit 221 uses the data pool number, the capacity of the entire data pool, the data area information for full backup, the data area information for backup by generation, the number of generations to be generated, the generation switching time and the backup. Receives a request to create a data pool area including the target volume number.

The data pool area management unit 221 generates the entire area of the data pool area 231 corresponding to the capacity of the entire data pool in the memory 23 based on the capacity of the entire data pool (step S22). The data pool area management unit 221 creates the entire full backup area 231a in the data pool area 231 based on the data area information for full backup (step S23).

The data pool area management unit 221 creates the entire generational backup area 231b in the data pool area 231 based on the data area information for generational backup (step S24). The data pool area management unit 221 divides the entire generational backup area 231b by the number of generations based on the number of generations to be generated (step S25).

Then, the data pool area management unit 221 creates the data pool management table 232 (step S26). The data pool area management unit 221 generates the data pool generation management table 233 (step S27). A specific example of the generated data pool management table 232 and data pool generation management table 233 will be described later.

As illustrated in FIG. 9, when the differential backup control unit 223 receives a write I/O request for a data block of a backup target volume from the host device 9, the differential backup control unit 223 performs the following processing. The differential backup control unit 223 writes the data for which the write I/O request is made in the data block of the backup target volume (step S31).

Then, the differential backup control unit 223 sends a response to the write I/O request to the host device 9 (step S32).

Then, the differential backup control unit 223 writes the data block of the data written in the backup target volume to the generational backup area 231b of the current generation (step S33).

Next, an example of the contents of various tables at each timing will be described with reference to FIGS. FIG. 10 is a diagram showing an example of various tables when the data pool area generation is completed. FIG. 11 is a diagram showing an example of various tables when the full backup is completed. FIG. 12 is a diagram showing an example of various tables after writing in the area of the backup target volume. 10 to 12, it is assumed that the number of generations to be generated is "2". It is assumed that the generation switching time is “60 minutes”. The backup target volume numbers are “A” and “B”.

As shown in FIG. 10, the contents of the data pool management table 232 when the data pool area generation processing is completed are as follows. When the data pool number is "1", "A" and "B" are stored as backup volume numbers. “2” is stored as the number of generations, “1” is stored as the in-use generation number, “1” is stored as the oldest generation number, “100” is stored as the full backup area address, and “1000000” is stored as the full backup size. "100" and "15000" are stored as the full backup destination start address. “60” is stored as the generation switching interval. Note that the full backup creation time does not store anything because no full backup has been performed.

The contents of the data pool generation management table 233 when the data pool area generation processing is completed are as follows. When the generation number is "1", "2" is stored as the next generation number. Note that other items are not stored because no differential backup has been performed.

As shown in FIG. 11, the contents of the data pool management table 232 when the full backup is completed are as follows. It is assumed that the full backup start time is “November 9, 2018 10:24:30”. In such a case, "November 9, 2018, 10:24:30" is stored as the full backup creation time. The other items are the same as when the data pool area was created.

The contents of the data pool generation management table 233 when the full backup is completed are as follows. Since the differential backup has not been performed when the full backup is completed, all items are the same as when the data pool area generation was completed.

As shown in FIG. 12, the contents of the data pool management table 232 after writing to the area of the backup target volume are as follows. After the completion of the full backup, "write 8192 bytes to the backup target volume A at 10:34:30 on November 9, 2018" and "backup target volume B at 10:40:30 on November 9, 2018". Write "1024 bytes to the backup target volume" and "Write 10 bytes 43 minutes 30 seconds on November 9, 2018 to the backup target volume A of 81920 bytes". In such a case, all the items in the data pool management table 232 are the same as when the full backup was completed.

The contents of the data pool generation management table 233 after writing to the area of the backup target volume are as follows. When the generation number is "1", the first record is "A" as the backup volume number, "November 9, 2018 10:34:30" as the data backup time, "8192" as the data backup size, “300” is stored as the data position. In the second record when the generation number is "1", the backup volume number is "B", the data backup time is "November 9, 2018 10:40:30", the data backup size is "1024", “8492” is stored as the data position. In the third record when the generation number is "1", the backup volume number is "A", the data backup time is "November 9, 2018 10:43:30", the data backup size is "81920", “9516” is stored as the data position.

[Effect of Example]
According to the above-described embodiment, when the CM 2 receives the generation instruction, the CM 2 manages the backup of the logical volume, and then manages the entire data of the backup source volume from the data pool area 231 generated as the backup data storage destination in the memory 23. And a generational backup area 231b for storing differential data are generated. Upon receiving the backup instruction, the CM 2 stores the entire data of the logical volume in the full backup area 231a, and after storing it, stores the data written in the logical volume in the generational backup area 231b. According to such a configuration, the CM 2 shares the backup area with the data pool, so that the individual volumes are not used for the execution of the full backup and the execution of the differential backup, so that the labor of the backup procedure can be reduced. .. That is, the CM 2 can reduce the backup procedure by generating the backup area for the backup target volume and executing the full backup and the differential backup with only two instructions, the generation instruction and the backup instruction from the user.

Further, according to the above-described embodiment, upon receiving the backup instruction, the CM 2 stores the entire data of the logical volume in the full backup area 231a. When a write request is made to the logical volume, the CM 2 writes the write-requested data to the logical volume and notifies the request source of the write request of a response to the write request. Then, the CM 2 stores the write-requested data in the generational backup area 231b. With such a configuration, the CM 2 backs up the data itself for which a write request has been made, rather than the copy-on-write type backup method (SnapOPC+), and thus the write response time can be shortened.

[Other]
In the example, the storage device 1 has been described as having two sets of CMs 2 and each disk 3 connected to each CM 2. However, the storage device 1 is not limited to these numbers. In the embodiment, the case where the number of backup target volumes is two has been described, but the number of backup target volumes may be three or four, and the number is not limited. ..

In addition, each component of the illustrated apparatus does not necessarily have to be physically configured as illustrated. That is, the specific mode of device distribution/integration is not limited to that shown in the figure, and all or part of the device may be functionally or physically distributed/integrated in arbitrary units according to various loads and usage conditions. Can be configured. For example, the full backup control unit 222 and the differential backup control unit 223 may be integrated as one unit. On the other hand, the full backup control unit 222 may be divided into a first full backup control unit that is a backup source and a second full backup control unit that is a backup destination. Further, the differential backup control unit 223 may be distributed to the first differential backup control unit when it is the backup source and the second differential backup control unit when it is the backup destination. Further, various tables stored in the memory 23 may be connected as an external device of the CM 2 via the network.

Further, in the embodiment, by implementing the function of the CM 2 by software, it is possible to obtain, for example, a backup control program having the same function. For example, the memory 23 stores a backup control program, a mid-execution result of the program, and the like. The CPU 22 reads the backup control program from the memory 23 and executes it.

The backup control program does not necessarily have to be stored in the memory 23 from the beginning. For example, a "portable physical medium such as a flexible disk (FD) inserted in the CM 2, a CD-ROM (Compact Disk Read Only Memory), a DVD (Digital Versatile Disk) disk, a magneto-optical disk, an IC (Integrated Circuit) card, etc. The program is stored in ". Then, the CM 2 may read the backup control program from these and execute it.

1 storage device 2 CM
21 CA
22 CPU
22A Backup control unit 221 Data pool area management unit 222 Full backup control unit 223 Differential backup control unit 23 Memory 231 Data pool area 231a Full backup area 231b Generational backup area 232 Data pool management table 233 Data pool generation management table 24 DI
3 disk 9 host device

Claims (4)

When a generation instruction is accepted, in order to manage the backup of the logical volume, the full backup data pool area that stores the entire data of the backup source volume and the differential data from the backup data pool area that is created in memory as the backup data storage destination. A pool area management unit that generates a differential data storage pool area that stores
When a backup instruction is received, the entire data of the logical volume is stored in the full backup data pool area, and after storing, the data written in the logical volume is stored in the differential data storage pool area. ,
A storage control device comprising: The data storage unit is
A first data storage unit that stores the entire data of the logical volume in the full backup data pool area when receiving the backup instruction;
When a write request is made to the logical volume, the data requested to be written is written to the logical volume, a request source of the write request is notified of a response to the write request, and the data requested to be written A second data storage unit for storing in the differential data storage pool area,
The storage control device according to claim 1, further comprising: A storage controller,
A storage system having a storage device,
The storage control device,
When a generation instruction is accepted, in order to manage the backup of the logical volume, the full backup data pool area that stores the entire data of the backup source volume and the differential data from the backup data pool area that is created in memory as the backup data storage destination. A pool area management unit that generates a differential data storage pool area that stores
When a backup instruction is received, the entire data of the logical volume is stored in the full backup data pool area, and after storing, the data written in the logical volume is stored in the differential data storage pool area. ,
A storage system comprising: When a generation instruction is accepted, in order to manage the backup of the logical volume, the full backup data pool area that stores the entire data of the backup source volume and the differential data from the backup data pool area that is created in memory as the backup data storage destination. And a differential data storage pool area that stores
Upon receiving a backup instruction, the entire data of the logical volume is stored in the full backup data pool area, and after storing, the data written in the logical volume is stored in the differential data storage pool area,
A backup control program that causes a computer to execute processing.

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