JP2020009106A - Storage control device and storage control program - Google Patents

Abstract

To efficiently secure storage areas which are backup destinations in a storage device.SOLUTION: A device comprises: a monitoring section 22 which monitors a free space in a backup storage area storing the backup data of a volume or a file which is a processing unit in backups; a determination section 22 in which, when the free space is determined to be less than a threshold through the monitoring, amongst the volumes or files which the backup data is stored in the backup storage areas therein, it determines volumes or files subject to moving control that moves the backup data to evacuation storage areas from the backup storage areas, and sets first information to management information 12 for the determined volumes or files; and a moving control section 23 which performs the moving control to the volumes or files to which the first information 12 is set.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a storage control device and a storage control program.

  In an operation using a storage device equipped with a storage device, for example, NAS (Network Attached Storage), a snapshot (Snap-Shot; hereinafter, sometimes referred to as “SS”) may be acquired as backup data. is there. The SS is one of backup methods for creating a copy of a volume or a file at the time of the SS request in units of a volume or a file, for example, and it is possible to create an SS for a plurality of generations.

  The NAS allocates the capacity of a logical volume from a storage area, assuming a capacity to be used in response to a user request. The logical volume may include a data area for storing data and a snapshot area for storing SS.

JP 2006-139664 A JP 2014-154044 A JP 2010-55420 A

  When acquiring SS as backup data in NAS, frequent rewriting of files more than expected, storage of large files, etc. may occur, resulting in insufficient logical volume capacity, insufficient SS storage capacity, etc. There is.

  In this case, the NAS control device can expand the logical volume capacity if the physical storage capacity of the storage device constituting the logical volume has free space.

  On the other hand, when there is no free space in the existing physical storage capacity, the administrator can cope with the operation by manually increasing the physical storage capacity, migrating data to another storage, or organizing or discarding data. ing.

  As described above, in a storage device that performs backup of an SS or the like, every time a volume capacity shortage occurs, a manual process for securing the storage capacity occurs, and the process including backup in the storage device stagnates. Become.

  In one aspect, an object of the present invention is to efficiently secure a storage area of a backup destination in a storage device.

  In one aspect, the storage control device may include a monitoring unit, a determining unit, and a first movement control unit. The monitoring unit may monitor a free space in a backup storage area for storing backup data of a volume or a file, which is a unit of backup processing. The determining unit, when the monitoring determines that the free space is less than a threshold, among the volumes or files in which backup data is stored in the backup storage area, the volumes or files to be subjected to the first movement control May be determined. The first movement control may be control for moving the backup data from the backup storage area to a save storage area. Further, the determining unit may set the first information as management information for the determined volume or file. Further, the first movement control unit may perform the first movement control on a volume or a file in which the first information is set.

  According to one aspect, a backup destination storage area in a storage device can be efficiently secured.

FIG. 14 is a diagram illustrating an example of a state where SS of a file is executed a plurality of times in a logical volume to which a storage area of a physical disk is allocated. It is a block diagram showing the example of composition of the system concerning one embodiment. FIG. 2 is a block diagram illustrating a hardware configuration example of a network storage according to an embodiment. FIG. 2 is a block diagram illustrating a hardware configuration example of a computer according to an embodiment. FIG. 4 is a diagram illustrating an operation example of one embodiment. It is a figure showing an example of a specific table. FIG. 9 is a diagram illustrating an example of a technique for storing an SS in a temporary extension area. It is a figure showing an example of a monitoring table. 6 is a flowchart illustrating an operation example by the control device according to the embodiment. 10 is a flowchart illustrating an operation example of a specific process illustrated in FIG. 9. 10 is a flowchart illustrating an operation example of a save SS execution process illustrated in FIG. 9. 10 is a flowchart showing an operation example of the SS monitoring process shown in FIG. FIG. 9 is a diagram illustrating another example of an SS acquisition unit according to an embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below is merely an example, and does not intend to exclude various modifications and application of technology not explicitly described below. For example, the present embodiment can be implemented with various modifications without departing from the spirit thereof. In the drawings used in the following embodiments, portions denoted by the same reference numerals represent the same or similar portions unless otherwise specified.

[1] One Embodiment [1-1] Backup of Storage Device First, backup of a storage device according to one embodiment will be described. FIG. 1 illustrates a snapshot of a file (Snap-Shot; hereinafter, referred to as “SS”) in a logical volume (hereinafter, may be simply referred to as “volume”) to which a storage area of a physical disk is allocated. FIG. 7 is a diagram illustrating an example of a state in which (A) is executed a plurality of times.

  As shown in the upper part of FIG. 1, it is assumed that a volume including a data area and an SS area is allocated to a partial storage area of a physical disk. Note that the file A is stored in the data area, and the SS of the file A is stored in the SS area.

  In this state, as shown in the lower part of FIG. 1, another file and the file Z are additionally stored in the data area, and when the SS of each file in the data area is created, the SS does not fit in the SS area. May run out of data area. In this case, the administrator expands the SS area or the data area by performing work such as expansion of the volume using a free storage area of the physical disk in response to, for example, an alert of insufficient capacity of the SS area.

  As described above, a large amount of SSs may cause a shortage of volume capacity. The same is true even if the mass storage of SS is a transient event.

  Then, every time such a capacity shortage of the volume occurs, manual operation by the administrator, for example, expansion of the storage area (physical capacity) is performed.

  However, as a result of repeatedly expanding the storage area in response to the temporary capacity shortage of the capacity of the volume, the volume retains an excess free capacity, and unnecessary investment increases.

  In order to avoid such a situation, for example, it is conceivable that the administrator periodically performs volume capacity monitoring, SS deletion management, and the like, but the operation burden is large.

  Note that mass storage of SSs may occur, for example, when a user of a storage device frequently saves SSs as a backup during a process of editing and processing a specific file. Due to such a large storage of SSs, expansion of the storage area can occur constantly.

  Also, for example, the mass storage of SSs described above often occurs at relatively short time intervals, and it is difficult for an administrator to manually cope with the situation before the SS storage area is exhausted. In order to deal with it, the operational burden increases. Further, when a large amount of SSs are stored, the data area is squeezed, and there is a possibility that saving new data in the data area may be restricted or impossible.

  Therefore, in one embodiment, it is assumed that a large amount of SSs are stored in the above-described use scene, and when a large amount of SSs are stored, the storage area of the backup destination such as the SS is efficiently saved. The method of securing will be described.

  According to a method to be described later according to an embodiment, even when a capacity shortage occurs in a volume, it is not necessary for an administrator to expand a storage area or monitor the storage area. Therefore, it is possible to avoid the occurrence of manual and permanent processing for securing the storage capacity, thereby suppressing stagnation of processing in the storage device.

[1-2] Configuration Example of One Embodiment Hereinafter, a configuration example of a storage system according to one embodiment will be described. FIG. 2 is a diagram illustrating a configuration example of the storage system 1 according to the embodiment. As illustrated in FIG. 2, the storage system 1 may exemplarily include a network storage (Network Storage; hereinafter, sometimes referred to as “NS”) 2 and a terminal 3 connected to the NS 2. . Note that the storage system 1 may include a plurality of NSs 2. Further, a plurality of terminals 3 may be connected to the NS 2.

  The terminal 3 is an example of a higher-level device that accesses the NS 2 to write or read data, for example, a file. Further, the terminal 3 may transmit to the NS 2 a request to execute an SS, which is an example of a backup of a file stored in the NS 2.

  Examples of the terminal 3 include a computer such as a server, a PC (Personal Computer), a tablet, a smartphone, or a PDA (Personal Digital Assistant). The terminal 3 may be used as, for example, a business server, a core server, or a client machine by a user. Note that the terminal 3 may be connected to the NS 2 via the network 4.

  Examples of the network 4 include an intranet such as a LAN (Local Area Network). Note that the network 4 may include a network such as a WAN (Wide Area Network) including the Internet. In addition, the network 4 may include a storage network such as a SAN (Storage Area Network).

  NS2 is an example of a storage device. NS2 is exemplified by NAS. In the following description, a NAS is taken as an example of the NS 2, but the present invention is not limited to this, and the NS 2 may be a storage device of various modes that provides a storage area to the terminal 3. , A storage device constituting a SAN. As illustrated in FIG. 2, the NS 2 may include, for example, a memory unit 10, a control device 20, and a plurality of storages 30.

  The memory unit 10 is an example of a storage unit that stores information related to backup, and may store various types of information used by the control device 20. The memory unit 10 may be realized by one or more storage devices.

  As illustrated in FIG. 2, the memory unit 10 may store, for example, information of the execution control information 11, the identification table 12, and the monitoring table 13. In the following description, for the sake of convenience, the specific table 12 and the monitoring table 13 are described as information in a table format, but these tables are information stored in a format such as an array or a database (DB). It may be. The identification table 12 and the monitoring table 13 are examples of management information for managing the first information and the second information related to the backup.

  The plurality of storages 30 is an example of a plurality of storage devices that provide a storage area accessible to the terminal 3 in the NS 2. The NS 2 may configure a disk array such as a RAID (Redundant Arrays of Inexpensive Disks) with a plurality of storages 30, for example. In the following description, for convenience, each storage area of the plurality of storages 30 or disk arrays may be referred to as a “physical storage area”.

  Examples of the storage 30 include a storage device such as a magnetic disk device such as an HDD (Hard Disk Drive) and a semiconductor drive device such as an SSD (Solid State Drive).

  The control device 20 is an example of a storage control device that performs control related to backup, for example, securing a storage area for storing an SS. Details of the control device 20 will be described later.

  Note that the memory unit 10 and the control device 20 may be mounted on a device (computer) different from the NS2. In this case, a computer including the memory unit 10 and the control device 20 may be communicably connected to the NS 2 via the network 4.

[1-3] Example of Hardware Configuration Next, an example of a hardware configuration of the NS 2 illustrated in FIG. 2 will be described with reference to FIG. As shown in FIG. 3, the NS 2 may illustratively include a processor 2a, a memory 2b, a battery 2b-1, a storage unit 2c, and an NWIF (Network Interface) unit 2d. In addition to these, the NS 2 may illustratively include a storage control unit 2e, a disk 2e-1, an I / O (Input / Output) unit 2f, and a reading unit 2g.

  The processor 2a is an example of an arithmetic processing device that performs various controls and calculations in the NS 2. The processor 2a may be communicably connected to each block in the NS 2 via a bus (for example, an internal bus) 2j. As the processor 2a, for example, an integrated circuit (IC) such as a CPU, an MPU, a GPU, an APU, a DSP, an ASIC, and an FPGA may be used. CPU is an abbreviation for Central Processing Unit, and MPU is an abbreviation for Micro Processing Unit. GPU is an abbreviation for Graphics Processing Unit, and APU is an abbreviation for Accelerated Processing Unit. DSP is an abbreviation for Digital Signal Processor, ASIC is an abbreviation for Application Specific IC, and FPGA is an abbreviation for Field-Programmable Gate Array.

  The memory 2b is an example of hardware that stores information such as various data and programs. Examples of the memory 2b include a volatile memory such as a RAM (Random Access Memory). At least a part of the storage area of the memory 2b may be used, for example, as a buffer or a cache for temporarily storing data transferred between the NWIF 2d and the storage control unit 2e. The battery 2b-1 is a battery that backs up the power of the memory 2b.

  The storage unit 2c is an example of hardware that stores information such as various data and programs. Examples of the storage unit 2c include various storage devices such as a nonvolatile memory, a magnetic disk device such as an HDD, and a semiconductor drive device such as an SSD. Examples of the non-volatile memory include a ROM (Read Only Memory), a flash memory, an SCM (Storage Class Memory), and the like.

  The memory unit 10 of the NS2 illustrated in FIG. 2 may be realized by, for example, at least one storage area of the memory 2b and the storage unit 2c of the NS2.

  The storage unit 2c may store a program 2h that realizes all or a part of various functions of the NS 2. The processor 2a can realize the function as the NS2 illustrated in FIG. 2 by expanding the program 2h stored in the storage unit 2c in the memory 2b and executing the program. The function as the NS2 may include, for example, a function of the control device 20 including an SS execution unit 21, an SS area monitoring unit 22, a save processing unit 23, and a return processing unit 24, which will be described later.

  The NWIF unit 2d is an example of a communication IF that controls connection with the network 4 and communication. For example, the NWIF unit 2d may control an Ethernet (registered trademark) IF conforming to a LAN, an adapter conforming to optical communication (for example, FC (Fibre Channel)), or the like. For example, the program 2h may be downloaded from the network 4 to the NS 2 via the communication IF and stored in the storage unit 2c.

  The storage control unit 2e may control a plurality of disks 2e-1 for storing data (for example, files), control transfer of data to the bus 2j, and the like. Examples of the disk 2e-1 include a magnetic disk device such as an HDD and a storage device such as a semiconductor drive device such as an SSD. The storage 30 of the NS2 illustrated in FIG. 2 may be realized by, for example, a plurality of disks 2e-1.

  The I / O unit 2f includes one or both of an input unit such as a mouse, a keyboard, or an operation button, and an output unit such as a monitor such as a touch panel display, an LCD (Liquid Crystal Display), a projector, or a printer. Good.

  The reading unit 2g is an example of a reader that reads data and program information recorded on the recording medium 2i. The reading unit 2g may include a connection terminal or a device to which the recording medium 2i can be connected or inserted. Examples of the reading unit 2g include an adapter conforming to USB (Universal Serial Bus), a drive device for accessing a recording disk, a card reader for accessing a flash memory such as an SD card, and the like. Note that the program 2h may be stored in the recording medium 2i, or the reading unit 2g may read the program 2h from the recording medium 2i and store the program 2h in the storage unit 2c.

  Examples of the recording medium 2i include a non-temporary recording medium such as a magnetic / optical disk and a flash memory. Examples of the magnetic / optical disk include a flexible disk, a CD (Compact Disc), a DVD (Digital Versatile Disc), a Blu-ray disk, and an HVD (Holographic Versatile Disc). Examples of the flash memory include a USB memory and an SD card. The CD includes, for example, a CD-ROM, a CD-R, a CD-RW, and the like. Examples of the DVD include a DVD-ROM, a DVD-RAM, a DVD-R, a DVD-RW, a DVD + R, a DVD + RW, and the like.

  The hardware configuration of the NS2 described above is an example. Therefore, the increase or decrease of hardware (for example, addition or deletion of an arbitrary block), division, integration in an arbitrary combination, addition or deletion of a bus, or the like in the NS 2 may be appropriately performed.

  For example, the memory unit 10 and the control device 20 may be provided in a device different from the NS2. FIG. 4 is a block diagram illustrating a hardware configuration example of the computer 5 including the memory unit 10 and the control device 20.

  As illustrated in FIG. 4, the computer 5 may illustratively include a processor 5a, a memory 5b, a storage unit 5c, an NWIF unit 5d, an I / O unit 5e, and a reading unit 5f. ) May be communicably connected to each other by a bus 5i. These blocks shown in FIG. 4 may have the same configuration as the block of the same name of NS2 shown in FIG.

  The memory unit 10 of the NS 2 illustrated in FIG. 2 may be realized by, for example, at least one storage area of the memory 5b and the storage unit 5c of the computer 5.

  The storage unit 5c may store a program 5g that realizes all or a part of various functions of the control device 20. The processor 5a can realize the functions of the control device 20 illustrated in FIG. 2 by expanding the program 5g stored in the storage unit 5c in the memory 5b and executing the program.

[1-4] Functional Configuration Example of Control Device Next, a functional configuration example of the control device 20 illustrated in FIG. 2 will be described with reference to FIGS. 2 and 5 to 8. As illustrated in FIG. 2, the control device 20 that manages the storage area of the SS in the NS 2 may include, for example, an SS execution unit 21, an SS area monitoring unit 22, a save processing unit 23, and a return processing unit 24. .

  The SS execution request may be issued from the terminal 3 to the NS 2, for example. The SS execution request may include, for example, information designating a file to be SS and a volume in which the file is stored. In the following description, it is assumed that the backup processing unit is a “file” unit.

  In one embodiment, for example, when a user of the NS 2 edits or processes a specific file via the terminal 3, the SS is frequently executed as a backup, and a large amount of SS is stored. Is assumed.

  Also, in the following description, it is assumed that the file size of the work target and SS target file and the execution frequency of SS are all gradually reduced by the editing / processing work of the specific file.

  In the following description, “SS” indicates a backup file (backup data) created by a snapshot operation, which is an example of backup. In addition, “SS” in the notation “execution of SS” indicates a snapshot as an operation.

  The SS execution unit 21 may process and control the execution (acquisition) of the SS according to the execution request of the SS. For example, when executing the SS in response to the execution request of the SS, the SS execution unit 21 acquires the number of executions of the SS and the data size of each SS for each file to be SS, and for example, the memory unit 10 or the like. May be stored as a part of the execution control information 11 of the SS.

  When the SS execution unit 21 executes (acquires) the SS of the file, the SS area monitoring unit 22 monitors the free space of the SS area in the logical volume on which the SS is to be executed, and determines whether the free space is less than the threshold. Is determined. The SS area is an example of a backup storage area. For example, as shown in the upper part of FIG. 5, the SS area monitoring unit 22 determines whether the ratio of the free space to the total capacity of the SS area is lower than a predetermined ratio, and determines that the ratio is lower than the predetermined ratio. If it is determined, a specifying process for specifying the SS to be saved in the temporary extension area may be executed.

  The “temporary extension area” is a temporary area created by using an unallocated free area in response to a shortage of free space in the SS area, and is a temporary storage area for expanding the SS area (hereinafter, “backup area”). Area). Unlike the permanent expansion of the storage area (physical capacity), the temporary expansion area is a temporary area that is expected to be released in response to the temporary lack of free space in the SS area. Therefore, it is described as a temporary extended area instead of an extended area.

  For example, the SS area monitoring unit 22 may create or update the specific table 12 in the specific processing, and notify the created or updated specific table 12 to the save processing unit 23 as a processing result of the specific processing.

  FIG. 6 is a diagram illustrating an example of the identification table 12. The specification table 12 is an example of information indicating a file specified as a target of the evacuation processing by the SS area monitoring unit 22, and includes “file name”, “capacity”, “SS count”, “file path”, and “evacuation name”. May be included. The entry included in the specific table 12 is an example of the first information set in the specific table 12 of the management information for the file specified (decided) as the save processing target.

  The “file name” and the “file path” indicate the name and storage location of the file of the save target SS included in the SS execution target volume. “Capacity” is the data size of the SS. The “SS count” indicates the number of times the SS has been acquired for each file. The “save name” indicates information on the temporary extension area of the save destination, for example, a volume name.

  The “capacity” set in the specific table 12 is the data size of the SS at the time of performing the save processing, and is a reference size in the subsequent processing. Further, as described above, the data size of the SS of a specific file gradually decreases after a large amount of storage occurs. Therefore, it can be said that the “capacity” set in the specific table 12 is the maximum data size that the SS of the specific file can take.

  In the specific process, the SS area monitoring unit 22 acquires the number of SSs and the data size of each SS for each volume of the SS execution target specified by the SS execution request in file units, and obtains both the number of SSs and the data size. May be specified as the evacuation target SS. The SS area monitoring unit 22 may extract, for example, the number of SSs and the data size from the execution control information 11.

  An SS having both a large SS number and a large data size may be, for example, an SS having a large value (size) obtained by multiplying the number of SSs and the data size. This is because an SS having a large number of SSs and a large size of each SS can be quantitatively determined to have a large amount of data change. For example, the SS area monitoring unit 22 may select one or more files from the top in descending order of the product.

  As described above, the SS area monitoring unit 22 may select a file whose data change amount is quantitatively large in the specific processing as a file for saving the SS from the SS area to the save area. Note that the SS area monitoring unit 22 may add an entry to the identification table 12 and set each piece of information acquired for the identified SS.

  The SS area monitoring unit 22 may select an SS to be saved in the temporary extension area based on at least one of the number of SSs and the size of each SS.

  As described above, the SS area monitoring unit 22 is an example of a monitoring unit that monitors free space in the SS area. When the free space is determined to be less than the threshold by monitoring, the SS area monitoring unit 22 moves the SS from the SS area to the evacuation storage area among the files in which the SS is stored in the SS area. It is an example of a determination unit that determines a file to be moved. The SS area monitoring unit 22 as an example of the determining unit may set an entry (first information) for the determined file in the specific table 12.

  The save processing unit 23 performs the save processing based on the specific table 12 created or updated by the SS area monitoring unit 22, as shown in the middle part of FIG.

  For example, the evacuation processing unit 23 may create a temporary expansion area of a predetermined size based on the capacity set in the specific table 12 in the evacuation processing. The save processing unit 23 sets the size of the temporary extension area to be created to be several times the capacity set in the specific table 12, for example, N (N is an integer of 2 or more) times, for example, 4 (N = 4) times. May be secured. The size of the temporary extension area is not limited to N times the size of the SS, and may be determined based on various conditions such as the capacity of the SS, the capacity of the storage 30, and the operating environment.

  As the temporary extended area, for example, at least a part of a free physical storage area that is not allocated to a volume in the storage 30 may be used. The temporary extended area may be created in the storage 30 (for example, a physical disk) to which the volume to be subjected to the SS belongs, or may be created in another storage 30. Alternatively, the temporary extended area may be created in a physical storage area other than the storage 30, for example, the memory unit 10 or another storage connected via the network 4.

  When creating the volume of the temporary expansion area, the save processing unit 23 may set the created volume name in the entry corresponding to the file of the save target SS in the specific table 12 (see FIG. 6).

  Further, when the evacuation processing unit 23 creates the temporary extension area in the evacuation processing, the evacuation processing unit 23 may evacuate (move) the SS to be evacuation set in the specific table 12 from the SS area to the temporary extension area. At this time, the save processing unit 23 may, for example, divide the temporary extended area into N, for example, into 4 (N = 4), and divide (each of) the SS to be saved in the SS area among the divided areas. May be moved to an empty divided area. That is, as described above, since a size N times the capacity of the SS is secured as the temporary extension area, the temporary extension area has a free area capable of storing N (N generations) SSs. I do. Therefore, the evacuation processing unit 23 divides the temporary extended area into N divided areas so that the SS can be stored in each divided area.

  As described above, the evacuation processing unit 23 is an example of the first movement control unit or the movement control unit that performs the first movement control on the file in which the entry of the specific table 12 is set.

  Further, after saving the SS, the save processing unit 23 releases the area where the save target SS is stored into the SS area to make it an unused (unallocated) area and returns the SS later. A reserved area of a predetermined size may be reserved (reserved) as the return area. The predetermined size may be a size of a predetermined ratio of the capacity of the SS at the time of evacuation, for example, a size of about 50%.

  When the save processing unit 23 saves the SS and secures the reserved area, it changes the execution (acquisition) rule of the SS for the file of the save target SS, and indicates that the save of the SS has been performed. Information on the target SS or the like may be notified to, for example, an administrator. As an example, the evacuation processing unit 23 may display a notification to the I / O unit 2f (see FIG. 3), or to a terminal (not shown) used by the administrator via the network 4. Notifications may be sent. In the following description, the same may be applied when notifying the administrator of other information or instructions.

  The change of the execution rule of the SS may include, for example, changing the storage location of the SS from the SS area to the temporary extension area, and changing the storage procedure of the SS for the temporary extension area. The changed execution rule of the SS may be stored in the memory unit 10 as a part of the execution control information 11, for example. Thus, the SS execution unit 21 can refer to the execution control information 11 and store the SS in the temporary extension area for the save target SS in accordance with the execution rule after the SS has been changed.

  Here, the execution process of the SS according to the changed execution rule by the SS execution unit 21 will be described.

  For example, as shown in the upper part of FIG. 7 (see the temporary extension area of “xmonth 01”), the SS storage procedure divides the newly acquired SS into the divided SS in which the oldest generation SS is stored. This may include overwriting and saving the area. Note that when an empty divided area exists in the temporary extended area, the empty divided area may be preferentially used as a storage destination of the SS. In other words, the SS executing unit 21 divides the SS into N divided areas obtained by dividing the save area into N in response to the SS execution request so that the latest N generations of SSs are stored in the save area. It can be said that it is stored in either.

  In FIG. 7, the SS of the x generation is denoted as “SS (x)” in order to identify the generation of the SS. The upper part of FIG. 7 shows that when a new SS (5) occurs, the oldest SS (1) is deleted and SS (5) is written in the storage area of SS (1). The SS execution unit 21 may save the SS to be saved according to the procedure illustrated in FIG.

  Here, the SS executing unit 21 may create or update the monitoring table 13 when executing the SS for the temporary extension area.

  FIG. 8 is a diagram illustrating an example of the monitoring table 13. The monitoring table 13 is information indicating the status of the SS in the temporary extension area, and includes items of “date”, “volume name”, “file name”, “capacity”, “update frequency”, and “file path”. It may have an entry. The entry included in the monitoring table 13 is an example of the second information including the execution timing of the backup according to the execution request and the data size of the backup data.

  “Date” is the date when the SS was executed, and is an example of a time stamp indicating the execution timing of the SS. “Volume name”, “file name”, and “file path” indicate the volume name of the temporary extension area in which the SS is stored, and the name and storage location of the file of the stored SS. “Capacity” is the data size of the SS when the SS is executed.

  “Update frequency” is information indicating the frequency of occurrence of SS, and indicates the number of times of execution of SS for the same file within a predetermined period. As the predetermined period, for example, “1 day” is given. The predetermined period is not limited to “one day”, but may be shorter, for example, several seconds to several hours, or longer, for example, several days or more, depending on the usage environment of NS2. An appropriate period may be set.

  Since the predetermined period serving as the reference of the “update frequency” is “1 day”, a date such as “2/1” is set as the “date” in the monitoring table 13, but the present invention is not limited to this. Not something. In the “date” (time stamp) of the monitoring table 13, “time”, “year”, and the like may be set in addition to “date” according to a predetermined period.

  As described above, the SS execution unit 21 responds to the SS execution request for the file in which the first information is set (for example, the file in which the entry of the specific table 12 is set as the evacuation process target), and Is an example of a backup execution unit that stores a file in a save area. The SS executing unit 21 as an example of the backup executing unit stores the entry of the monitoring table 13 including the execution timing of the SS in response to the execution request and the data size of the SS in the monitoring table 13 of the management information. May be stored.

  The return processing unit 24 performs a monitoring process of the SS in the temporary extension area created by the evacuation processing unit 23 based on the monitoring table 13, as shown in the middle part of FIG. Note that the SS execution unit 21 and the return processing unit 24 may operate asynchronously with each other.

  For example, the return processing unit 24 may determine whether or not the contents of the monitoring table 13 satisfy the return condition of the SS at a predetermined timing, for example, at a timing when the SS is stored in the temporary extension area.

  The return condition of the SS includes, for example, at least one of the following (a) and (b) for each file name of the monitoring table 13.

(A) The update frequency is equal to or lower than a predetermined frequency.
The predetermined frequency is a frequency at which it can be determined that the mass storage of SSs has converged, and may be, for example, a value of about 4 times / day.

(B) The capacity of the SS is equal to or less than a predetermined ratio of the capacity when the evacuation processing is executed.
The predetermined ratio may be the same as the “predetermined ratio” used when the evacuation processing unit 23 secures the reserved area in the SS area in the evacuation processing, and may be, for example, a value of about 50%. The condition (b) is that the capacity of the SS is equal to or less than the capacity of the reserved area, or the data size of the SS when the data size of the SS set in the monitoring table 13 is selected by the SS area monitoring unit 22. The condition can be read as being equal to or less than the predetermined ratio.

  If there are a plurality of SS entries for the same file name in the monitoring table 13, the return processing unit 24 compares the capacity of the latest entry among the plurality of entries with the comparison of the condition (b). May be used.

  The return processing unit 24 may refer to the monitoring table 13 and determine whether or not there is a file name that satisfies at least one of the above (a) and (b), for example, both conditions. When there is a file name that satisfies both the conditions (a) and (b), the return processing unit 24 reserves the latest SS corresponding to the file name as shown in the lower part of FIG. A process of returning (moving) to the area may be performed.

  The upper, middle, and lower rows in FIG. 7 respectively correspond to the temporary extension areas of the SSs whose “dates” are “x month 01”, “x month 02”, and “x month 03” in the monitoring table 13. The storage state is shown.

  In the upper part of FIG. 7, at least five SSs of SS (1) to SS (5) are stored, and the size of the latest SS (5) is not less than 50% of the capacity of the specific table 12. Is shown. In this case, since both the conditions (a) and (b) are not satisfied, the return processing unit 24 determines that the return condition is not satisfied when the monitoring table 13 indicates the state in the upper part of FIG.

  In the middle part of FIG. 7, four SSs from SS (m−3) to SS (m) are stored, and the size of the latest SS (m) is not less than 50% of the capacity of the specific table 12. Show the case. In this case, while the condition (a) is satisfied but the condition (b) is not satisfied, the return processing unit 24 does not satisfy the return condition when the monitoring table 13 indicates the middle state of FIG. Is determined.

  In the lower part of FIG. 7, three SSs from SS (n−2) to SS (n) are stored as the SSs stored on “x03”, and the latest SS (n) is stored. The case where the size is less than 50% of the capacity of the specific table 12 is shown. In this case, since both of the conditions (a) and (b) are satisfied, the return processing unit 24 determines that the return condition is satisfied when the monitoring table 13 indicates the state in the lower part of FIG. n) is returned to the reserved area.

  Also, when the return processing unit 24 performs the return processing of the SS, it returns the SS execution (acquisition) rule to the SS file on which the return processing has been performed, and returns the storage destination of the SS to the volume before evacuation. This may be notified to the administrator, for example.

  The return processing unit 24 deletes the corresponding temporary extension area and deletes the entry corresponding to the file or SS from each of the identification table 12 and the monitoring table 13 for the file whose SS has been returned to the reserved area. May be.

  As described above, the return processing unit 24 determines a file to be subjected to the second movement control among the files in which the SS is stored in the save area, and moves one SS of the file from the save area to the SS area. It is an example of the 2nd movement control part which moves.

  As described above, the control device 20 according to the embodiment monitors the backup of the file to the file and saves the file that affects the storage area of the storage 30 by the backup to the temporary extended area, thereby saving the storage area. Eliminate the impact on This makes it possible to absorb a temporary increase or decrease in the storage area (for example, the SS area) of the volume due to a large amount of SS acquisition.

  For example, since the SS performs data replication for all file data before update regardless of the amount of change in the file, the SS greatly affects the volume capacity consumption. For this reason, in one embodiment, the SSs to be saved are narrowed down to those SSs having a large file size and a large number of updates (SS times).

  Further, for example, assuming that a user of NS2 frequently performs SS in the process of editing and processing a file, a temporary increase in the SS capacity is not due to an update of the entire file but an update with a small amount of change. It is highly likely that this is caused by repetition.

  Therefore, as a monitoring condition for returning the SS evacuated to the temporary extension area to the original SS area, in other words, for determining that the SS evacuating operation is unnecessary, the update in a short time is completed. (For example, less than five updates per day) are included in the conditions.

  Also, when returning an SS from the temporary extended area to the original SS area, if the SS is not restored in a state where the SS capacity of the save destination is reduced, the logic for performing the save processing again for the SS after the return processing to the SS area operates. In some cases. After the evacuation process, the administrator is notified that the evacuation has been performed. Therefore, data may be organized and expanded for the volume by the administrator. There is a risk that the evacuation process will be performed. Therefore, as a monitoring condition for returning the SS evacuated to the temporary extended area to the original SS area, a reduction in the SS capacity (for example, about 50% of the evacuation time) is included in the condition.

  As described above, according to the control device 20 according to the embodiment, it is possible to dynamically secure an appropriate capacity for the storage capacity of the SS used by a plurality of transient SS execution processes. Operation can be continued.

  In addition, since excess free space is not permanently maintained, unnecessary investment can be avoided.

  Furthermore, the load on the operation by the administrator can be eliminated by the volume monitoring of the volume by the control device 20 and the management of the deletion of the SS.

  As described above, according to the embodiment, it is possible to efficiently secure the storage area of the backup destination in the NS 2.

[1-5] Operation Example Hereinafter, an operation example of the control device 20 configured as described above will be described with reference to FIGS. 9 to 12.

  First, an operation example when the control device 20 receives an SS execution request will be described with reference to FIG. As illustrated in FIG. 9, when receiving the execution of the SS (Step S1), the control device 20 determines whether or not the storage destination of the SS is the temporary extension area (Step S2). For example, the control device 20 refers to the execution control information 11 and determines whether or not the storage destination is set (changed) to the temporary extension area in the SS execution rule for the file specified in the execution request. Good.

  If it is determined that the storage destination of the SS is not the temporary extension area (No in step S2), the control device 20 specifies the SS area monitoring unit 22 and the evacuation processing unit 23 (step S3), and executes the SS execution unit 21 (Step S4). The specific process (step S3) and the SS execution process (step S4) are executed asynchronously with each other, and the operation may be ended when each process is completed.

  On the other hand, when it is determined that the storage destination of the SS is the temporary extended area (Yes in step S2), the control device 20 determines the identification processing (step S5), the evacuation SS execution processing (step S6), and the return processing unit 24. , The SS monitoring process (step S7) is started. The specifying process (Step S5), the evacuation SS execution process (Step S6), and the SS monitoring process (Step S7) are executed asynchronously with each other, and the operation may be ended when each process is completed.

  Since the same process is performed regardless of whether or not the storage destination of the SS is the temporary extension area, the specific process may be started before the determination in step S2 is performed.

  Further, the SS execution process (step S4) executed when the storage destination of the SS is the SS area may be realized by a known method. For example, the SS executing unit 21 may save a snapshot of the file specified in the execution request at the time of receiving the execution request in the SS area of the volume to which the file belongs, and may transmit a completion response to the terminal 3. . The storage of the SS may be performed in the background, and the SS executing unit 21 may transmit a completion response to the terminal 3 in parallel with the storage of the SS.

[1-5-1] Operation Example of Specific Processing Next, an operation example of the specific processing by the SS area monitoring unit 22 and the evacuation processing unit 23 will be described with reference to FIG. The SS area monitoring unit 22 and the save processing unit 23 are activated in step S3 or S5 in FIG. 9 at the time of updating a file (for example, when acquiring an SS), and execute the specific processing illustrated in FIG.

  The SS area monitoring unit 22 monitors the free space of the SS area in the volume (SS execution target volume) designated by the SS execution request, and determines whether the free space is less than a predetermined ratio, for example, less than 20%. Is determined (step S11). If it is determined that the free space is not less than the predetermined ratio (No in step S11), the process ends.

  On the other hand, when it is determined that the free space is less than the predetermined ratio (Yes in step S11), the SS area monitoring unit 22 determines whether the specific table 12 exists in the memory unit 10 (step S12).

  If it is determined that the specific table 12 does not exist (No in step S12), the SS area monitoring unit 22 creates, for example, an empty (entry-uninputted) specific table 12 in the memory unit 10 (step S13), and performs processing. Shifts to step S14.

  When it is determined that the specific table 12 exists (Yes in step S12), the SS area monitoring unit 22 acquires information on the number of SSs and the data size for each SS in the SS execution target volume in file units. (Step S14). Note that these pieces of information may be extracted from the execution control information 11 updated by the SS execution unit 21 when the SS is executed, for example.

  Then, the SS area monitoring unit 22 calculates, for each file, a product of the number of SSs and the data size of the SS (for example, the maximum data size), and selects a file having a large product (for example, the largest). (Step S15).

  In step S15, selection of a plurality of files may be permitted. For example, when there are a plurality of files whose products exceed a predetermined threshold, or when it is predicted that the free space of the SS area will not exceed a predetermined ratio even if the file with the largest product is saved, the SS area The monitoring unit 22 may select a predetermined number of files in descending order of the product.

  Next, the SS area monitoring unit 22 sets the information of the selected file, for example, the file name, the file path, and the number of SSs and the data size (for example, the maximum data size) acquired in step S14 in the specific table 12. (Step S16).

  Based on the data size set in the specific table 12, the evacuation processing unit 23 assigns a temporary expansion area having a size N times the data size, for example, four times, to an unallocated area in a physical storage area such as the storage 30 or a disk array. It is created (step S17).

  Further, the evacuation processing unit 23 determines whether or not the temporary extended area has been created in step S17 (step S18). For example, when it is determined that the temporary expansion area could not be created due to insufficient capacity of the unallocated area (No in step S18), the evacuation processing unit 23 notifies the administrator of a manual expansion instruction of the capacity of the physical storage area. Then (step S19), the process proceeds to step S20.

  After the notification in step S19, the SS area monitoring unit 22 may transition to a state of waiting for manual addition, and for example, may stop or stop the processing illustrated in FIG. In this case, the SS area monitoring unit 22 may restart or start the process from step S20 when detecting that the manual addition by the administrator is completed, or may execute the process in response to the reception of the next SS execution request. The specific processing from S11 may be performed.

  If it is determined that the temporary extended area has been created (Yes in step S18), the save processing unit 23 sets the volume name of the temporary extended area that is the save destination in the entry relating to the SS to be saved in the monitoring table 13. (Step S20).

  The save processing unit 23 saves (moves) the SS of the selected file from the SS area to the temporary extension area (step S21), deletes the saved SS from the SS area, and secures a reserved area in the SS area. (Step S22). The size of the reserved area may be, for example, a predetermined ratio of the capacity (SS capacity at the time of movement) set in the specific table 12, for example, about 50%.

  Further, the evacuation processing unit 23 changes the execution rule of the SS regarding the SS to be saved (step S23). The changed execution rule may be set in the execution control information 11, for example.

  Then, the save processing unit 23 notifies the administrator that the SS has been saved (step S24), and the process ends.

[1-5-2] Operation Example of Save SS Execution Process Next, an operation example of the save SS execution process by the SS execution unit 21 will be described with reference to FIG. The SS executing unit 21 is activated in step S6 of FIG. 9 when acquiring the SS in the temporary extension area, and executes the evacuation SS execution process illustrated in FIG.

  The SS execution unit 21 performs an SS execution process on the temporary extension area (Step S31). In the SS execution process, the SS execution unit 21 refers to the execution control information 11, acquires the volume of the temporary extension area of the save destination as the SS storage destination, and issues an SS execution request to the free divided area in the volume. The SS of the specified file may be saved.

  If there is no free divided area in the volume of the temporary extended area, the SS execution unit 21 deletes the SS in the (past) divided area with the oldest update timing, and designates the SS in the divided area. The SS of the file may be stored, and a completion response may be transmitted to the terminal 3. In step S31, the SS execution unit 21 may store the SS in the background, similarly to the SS execution process for the SS area.

  Next, the SS execution unit 21 determines whether the monitoring table 13 exists in the memory unit 10 (Step S32).

  If it is determined that the monitoring table 13 does not exist (No in step S32), the SS execution unit 21 creates, for example, an empty (entry-uninputted) monitoring table 13 in the memory unit 10 (step S33), and Move to step S34.

  If it is determined that the monitoring table 13 exists (Yes in step S32), the SS executing unit 21 sets information on the executed SS in the monitoring table 13 (step S34), and the process ends. The executed SS information is, for example, each item in the entry shown in FIG. The capacity may be set to the capacity of the SS at the time of execution of the SS, and the update frequency may be the number (number of times) of the same file for the same file within a predetermined period (for example, one day). May be set.

  The SS execution processing in step S31 may be executed in parallel with or after the update processing of the monitoring table 13 in steps S32 to S34.

[1-5-3] Operation example of SS monitoring processing Next, an operation example of the SS monitoring processing by the return processing unit 24 will be described with reference to FIG. The return processing unit 24 is activated in step S7 of FIG. 9 when acquiring the SS in the temporary extension area, and performs the SS monitoring process illustrated in FIG.

  The return processing unit 24 determines whether the monitoring table 13 exists in the memory unit 10 (Step S41). If it is determined that the monitoring table 13 does not exist (No in step S41), the process ends because the SS has not been saved and monitoring is not required.

  When determining that the monitoring table 13 exists (Yes in step S41), the return processing unit 24 refers to the monitoring table 13 and determines whether there is an SS satisfying the SS return condition (step S42).

  For example, the return processing unit 24 refers to the monitoring table 13 and, for each file name, the update frequency is equal to or less than a predetermined frequency (for example, 4 times / day), and the SS capacity is a predetermined ratio at the time of evacuation (for example, 50%). The following SS may be detected as an SS satisfying the SS return condition.

  When it is determined that there is an SS satisfying the SS return condition (Yes in step S42), the return processing unit 24 performs a return process of returning the latest SS among the SSs satisfying the condition from the temporary extended area to the SS area (step S42). S43). For example, the return processing unit 24 may select the latest generation SS among the SSs with the same file name as the latest SS, and move the selected latest SS to the reserved area of the SS area.

  Next, the return processing unit 24 changes the execution rule of the SS for which the return processing has been completed so as to return to the original execution rule (step S44). Changes in the execution rule may include, for example, changing the storage destination from the temporary extension area to the SS area, changing the storage procedure for the SS area, and the like. The changed execution rule may be set in the execution control information 11, for example.

  Further, the return processing unit 24 deletes the temporary extension area of the SS for which the return processing has been completed (step S45). Deletion of the temporary extension area may include, for example, deletion of SS data stored in the temporary extension area, release (release) of physical storage area to the temporary extension area (volume), and the like.

  Further, the return processing unit 24 deletes the information of the SS for which the return processing has been completed from the monitoring table 13 (step S46). For example, one or more entries relating to the SS for which the return processing has been completed may be deleted from the monitoring table 13.

  Next, the return processing unit 24 determines whether or not an entry exists in the monitoring table 13 (Step S47). When it is determined that the entry does not exist (No in Step S47), the return processing unit 24 deletes the monitoring table 13 from the memory unit 10 (Step S48), and the process proceeds to Step S49.

  If it is determined that an entry exists in the monitoring table 13 (Yes in step S47), the return processing unit 24 notifies the administrator that the storage destination of the SS for which the return processing has been completed has been returned to the SS area (step S49). ).

  Further, the return processing unit 24 deletes the information of the SS for which the return processing has been completed from the specific table 12 (step S50). For example, the entry relating to the SS for which the return processing has been completed may be deleted from the specific table 12.

  Next, the return processing unit 24 determines whether or not an entry exists in the specific table 12 (Step S51). If it is determined that an entry exists (Yes in step S51), the process ends. If it is determined that there is no entry (No in step S51), the return processing unit 24 deletes the specific table 12 from the memory unit 10 (step S52), and the process ends.

  When it is determined in step S42 that there is no SS satisfying the SS return condition (No in step S42), the return processing unit 24 determines whether the SS capacity in the temporary extension area is larger than the SS capacity at the time of evacuation. Is determined (step S53). For example, the return processing unit 24 determines the first capacity of the SS at the time of evacuation set in the specific table 12 and the second capacity of the SS stored in the temporary extension area set in the monitoring table 13. By comparison, it may be determined whether the second capacity is larger than the first capacity. If a plurality of generations of SSs are stored in the temporary extension area, the second capacity may be the capacity of the latest generation of SSs, or may be the average or maximum of the stored capacity of the plurality of generations of SSs. Value may be used.

  If it is determined that the SS capacity in the temporary extension area is not larger than the SS capacity at the time of evacuation (No in step S53), the process ends.

  On the other hand, when it is determined that the SS capacity in the temporary extended area is larger than the SS capacity at the time of evacuation (Yes in step S53), the file size is larger than that at the time of evacuation, so that the capacity of the temporary extended area becomes insufficient. ing. This is because the size of the temporary extension area is ensured as N times the SS capacity at the time of evacuation.

  Therefore, the return processing unit 24 determines whether the temporary extension area can be extended in the physical storage area (step S54). As an example, the return processing unit 24 determines that the sum of the current size of the temporary extended area (volume) and the size of the unallocated area of the storage 30 or the disk array is N times the second capacity indicating the current SS capacity. It is determined whether or not the size is larger than the size. If the size is larger, it may be determined that expansion is possible.

  When it is determined that the temporary extension area can be extended (Yes in step S54), the return processing unit 24 extends the capacity of the temporary extension area to N times the capacity of the second capacity (step S55). Ends.

  On the other hand, if it is determined that the temporary expansion area cannot be expanded (No in step S54), the return processing unit 24 notifies the administrator that the capacity (volume capacity) of the temporary expansion area is insufficient. (Step S56), the process ends. Thus, the administrator who has received the notification can expand the capacity of the storage 30 or the disk array. Therefore, in the next SS monitoring process, when the process transitions to step S54, the return processing unit 24 can expand the capacity of the temporary expansion area in step S55 via the Yes route of step S54.

[2] Others The technology according to the above-described embodiment can be modified and modified as follows.

  For example, each functional block of the control device 20 shown in FIG. 2 may be combined or divided in an arbitrary combination.

  Further, the function of the control device 20 may be realized by the processor 2a or 5a which is a multiprocessor or a multicore processor. Furthermore, at least a part of the functions of the NS 2 or the control device 20 may be distributed or redundantly arranged in a plurality of computers, for example, in a cloud environment.

  Further, in one embodiment, the SS is acquired in file units, but is not limited to this. For example, as shown in FIG. 13, the SS may be acquired in volume units.

  When the SS is acquired in units of volume, the description according to the embodiment may be obtained by replacing “file” illustrated in FIG. 5 with “volume” as illustrated in FIG. In addition, the “data area” including the file and the “volume” including the data area and the SS area shown in FIG. 5 may be read as “data volume group” and “volume group”, respectively. Further, the “physical disk” illustrated in FIG. 5 may be replaced with a logical disk including an unallocated area that is a candidate for a temporary extended area, a data volume group, and an SS area.

  Note that the SS acquisition (movement) unit is not limited to a file unit or volume unit, and may be performed in various units capable of performing “backup”.

[3] Supplementary Note Regarding the above embodiment, the following supplementary note is further disclosed.

(Appendix 1)
A monitoring unit that monitors free space in a backup storage area that stores backup data of a volume or a file that is a unit of backup processing;
When it is determined by the monitoring that the free space is less than the threshold, the backup data is moved from the backup storage area to the evacuation storage area among the volumes or files in which the backup data is stored in the backup storage area. (1) a determination unit that determines a volume or file to be subjected to movement control, and sets the first information in the management information for the determined volume or file;
A first movement control unit that performs the first movement control on a volume or a file in which the first information is set;
Storage control device with

(Appendix 2)
The determination unit determines a volume to be subjected to the first movement control based on at least one of a backup execution count and a data size of backup data from a volume or a file in which backup data is stored in the backup storage area. Or determine the file,
The storage control device according to supplementary note 1.

(Appendix 3)
The determining unit determines one or more volumes or files from the top as the target of the first movement control in descending order of the product of the number of executions and the data size.
The storage control device according to attachment 2.

(Appendix 4)
In response to a backup execution request for the volume or file in which the first information is set, backup data of the volume or file is stored in the save storage area, and the backup execution timing corresponding to the execution request and the backup A backup execution unit that sets second information including the data size of the data in the management information.
4. The storage control device according to any one of supplementary notes 1 to 3.

(Appendix 5)
Among the volumes or files in which backup data is stored in the evacuation storage area, a volume or file to be subjected to the second migration control is determined, and one backup data of the volume or file determined to be the object of the second migration control is determined. A second movement control unit for moving the evacuation storage area to the backup storage area.
The storage control device according to attachment 4.

(Appendix 6)
The second movement control unit determines, based on the second information, a volume or a file for which the number of backups performed in a predetermined period is equal to or less than a predetermined number as a target of the second migration control.
The storage control device according to supplementary note 5.

(Appendix 7)
The second movement control unit may include a volume or file whose data size of the backup data set in the second information is equal to or less than a predetermined ratio of the data size of the backup data when the data size is determined as the target of the first movement control. Is determined as an object of the second movement control.
7. The storage control device according to supplementary note 5 or 6.

(Appendix 8)
The first movement control unit is the evacuation storage area for the volume or file indicated by the first information, and has a capacity N times the data size of the backup data when determined as the target of the first movement control. Creating the save storage area in an unallocated storage area of a storage device, and performing the first movement control using the created save storage area;
8. The storage control device according to any one of supplementary notes 4 to 7.

(Appendix 9)
The backup execution unit responds to a backup execution request for the volume or file in which the first information is set so that backup data for the latest N generations is stored in the save storage area. Is stored in one of N divided areas obtained by dividing the evacuation storage area into N,
The storage control device according to supplementary note 8.

(Appendix 10)
Monitor the free space in the backup storage area that stores the backup data of the volume or file that is the unit of backup processing,
When it is determined by the monitoring that the free space is less than the threshold, the backup data is moved from the backup storage area to the evacuation storage area among the volumes or files in which the backup data is stored in the backup storage area. (1) Determine a volume or file to be subjected to movement control, set first information in the determined volume or file as management information,
Performing the first movement control on a volume or a file in which the first information is set;
A storage control program that causes a computer to execute processing.

(Appendix 11)
The determination is based on at least one of the number of times backup is executed, and the data size of the backup data, from the volume or the file in which the backup data is stored in the backup storage area, Determine the file,
The storage control program according to supplementary note 10.

(Appendix 12)
In the determination, one or more volumes or files from the top are determined as the targets of the first movement control in the descending order of the product of the number of execution times and the data size.
The storage control program according to supplementary note 11.

(Appendix 13)
In response to a backup execution request for the volume or file in which the first information is set, storing backup data of the volume or file in the save storage area;
Setting, in the management information, second information including a backup execution timing corresponding to the execution request and a data size of the backup data;
The storage control program according to any one of Supplementary Notes 10 to 12, which causes the computer to execute a process.

(Appendix 14)
Among the volumes or files in which backup data is stored in the save storage area, a volume or file to be subjected to the second movement control is determined,
Performing the second movement control of moving one backup data of a volume or a file determined as a target of the second movement control from the backup storage area to the backup storage area;
14. The storage control program according to supplementary note 13, which causes the computer to execute a process.

(Appendix 15)
Based on the second information, a volume or a file for which the number of backups performed in a predetermined period is equal to or less than a predetermined number is determined as a target of the second migration control.
The storage control program according to attachment 14.

(Appendix 16)
A volume or file whose data size of the backup data set in the second information is equal to or less than a predetermined ratio of the data size of the backup data when the data size is determined as the target of the first migration control is set to the second migration control. Decide as a target,
The storage control program according to Supplementary Note 14 or 15.

(Appendix 17)
The backup storage area for the volume or file indicated by the first information, which is N times as large as the data size of the backup data when determined as the target of the first migration control, In the unallocated storage area, and performing the first movement control using the created evacuation storage area;
17. The storage control program according to any one of supplementary notes 13 to 16, wherein the storage control program causes the computer to execute a process.

(Appendix 18)
In response to a backup execution request for the volume or file in which the first information is set, the backup data of the volume or file is deleted so that the latest N generation backup data is stored in the save storage area. Storing the save storage area in any of N divided areas obtained by dividing the save storage area into N parts;
18. The storage control program according to claim 17, wherein the storage control program causes the computer to execute a process.

Reference Signs List 1 storage system 2 network storage 3 terminal 4 network 10 memory unit 11 execution control information 12 identification table 13 monitoring table 20 control device 21 SS execution unit 22 SS area monitoring unit 23 evacuation processing unit 24 return processing unit 30 storage

Claims (10)

A monitoring unit that monitors free space in a backup storage area that stores backup data of a volume or a file that is a unit of backup processing;
When it is determined by the monitoring that the free space is less than the threshold, the backup data is moved from the backup storage area to the evacuation storage area among the volumes or files in which the backup data is stored in the backup storage area. (1) a determination unit that determines a volume or file to be subjected to movement control, and sets the first information in the management information for the determined volume or file;
A first movement control unit that performs the first movement control on a volume or a file in which the first information is set;
Storage control device with The determination unit determines a volume to be subjected to the first movement control based on at least one of a backup execution count and a data size of backup data from a volume or a file in which backup data is stored in the backup storage area. Or determine the file,
The storage control device according to claim 1. The determining unit determines one or more volumes or files from the top as the target of the first movement control in descending order of the product of the number of executions and the data size.
The storage control device according to claim 2. In response to a backup execution request for the volume or file in which the first information is set, backup data of the volume or file is stored in the save storage area, and the backup execution timing corresponding to the execution request and the backup A backup execution unit that sets second information including the data size of the data in the management information.
The storage control device according to claim 1. Among the volumes or files in which backup data is stored in the evacuation storage area, a volume or file to be subjected to the second migration control is determined, and one backup data of the volume or file determined to be the object of the second migration control is determined. A second movement control unit for moving the evacuation storage area to the backup storage area.
The storage control device according to claim 4. The second movement control unit determines, based on the second information, a volume or a file for which the number of backups performed in a predetermined period is equal to or less than a predetermined number as a target of the second migration control.
The storage control device according to claim 5. The second movement control unit may include a volume or a file whose data size of the backup data set in the second information is equal to or less than a predetermined ratio of the data size of the backup data when the data size is determined as the target of the first movement control. Is determined as an object of the second movement control.
The storage control device according to claim 5. The first movement control unit is an evacuation storage area for the volume or file indicated by the first information, and is a data size N (where N is 2) of backup data when determined as a target of the first movement control. Creating the evacuation storage area having a capacity of the above (integer) times in an unallocated storage area of a storage device, and performing the first movement control using the created evacuation storage area;
The storage control device according to claim 4. The backup execution unit responds to a backup execution request for the volume or file in which the first information is set so that backup data for the latest N generations is stored in the save storage area. Is stored in one of N divided areas obtained by dividing the evacuation storage area into N,
The storage control device according to claim 8. Monitor the free space in the backup storage area that stores the backup data of the volume or file that is the processing unit of the backup,
When it is determined by the monitoring that the free space is less than the threshold, the backup data is moved from the backup storage area to the evacuation storage area among the volumes or files in which the backup data is stored in the backup storage area. (1) Determine a volume or file to be subjected to movement control, set first information in the determined volume or file as management information,
Performing the first movement control on a volume or a file in which the first information is set;
A storage control program that causes a computer to execute processing.

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