JP2019053477A - File control device, file control method, and program - Google Patents

Abstract

To address a technical problem such that, in a hierarchy-type storage that has a duplication exclusion storage at an upper Tier, even if a file in the upper Tier is transferred to a lower Tier, there is a possibility that a desired empty capacity is not secured.SOLUTION: Provided is transfer means for performing a duplication exclusion process of not newly storing an already-stored data unit among data units contained in a file constructed by one or a plurality of data units, selecting, from the files stored in a first storage device that stores the files, the file to be transferred from the first storage device to a second storage device that stores the to-be-transferred file, and transferring the selected file from the first storage device to the second storage device. The transfer means selects the file to be transferred from the first storage device to the second storage device on the basis of reference number information that indicates a reference number which is the number of files referring to the data unit in the first storage device.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a file control device, a file control method, and a program, and more particularly, to a file control device, a file control method, and a program that perform hierarchical storage management.

  Hierarchical storage having a high-speed but expensive file storage device (upper tier) and a low-speed but inexpensive file storage device (lower tier) is known (see FIG. 1). As shown in FIG. 1, in the hierarchical storage, the file stored in the upper tier is transferred to the lower tier according to the access frequency of the file. With such a configuration, the hierarchical storage can realize a high-speed, large-capacity, and inexpensive system.

  In the tiered storage as described above, when the deduplication technology is used for the upper tier, it is possible to improve the substantial capacity unit price of the upper tier which is high speed but expensive and small capacity by deduplication of file data. As a technique related to such a technique, there is, for example, Patent Document 1. Patent Document 1 describes a computer system having a first computer (upper tier) and a second computer (lower tier). The first computer has a first storage area for storing files transmitted and received from the host device. Further, the second computer has a second storage area for storing a file migrated from the first computer. Then, the first computer moves the first file stored in the first storage area to the second computer in accordance with the access status from the host device. In addition, the second computer determines whether the transferred first file and another file overlap, creates duplicate file information, and transmits the duplicate file information to the first computer. When the first computer receives a read request for the first file from the host device, the second file that overlaps the first file is stored in the first storage area based on the received duplicate file information. It is determined whether or not. If the first computer determines that the duplicate second file is stored in the first storage area, the first computer uses the second file to respond to the host device.

Japanese Patent No. 5427533

  In the case of the technique described in Patent Document 1, the first computer (upper tier) transfers the first file stored in the first storage area to the second computer according to the access status from the upper device. Migrate to Specifically, for example, the first computer migrates files from the first computer to the second computer in order of the last access date and time.

  When file migration based on the last access date / time is performed from the upper tier that has been deduplicated to the lower tier, the file is migrated (desired from the upper tier) as desired, as will be described later. In some cases, it was not possible to secure the capacity.

  For example, FIG. 2 shows the concept of deduplication storage. Referring to FIG. 2, file A is composed of three data units, segment A, segment B, and segment C. The file B is composed of two data units, a segment D and a segment E. File C is composed of two data units, segment A and segment C. The segment indicates a data unit constituting the file.

  In the state shown in FIG. 2, for example, it is assumed that the file with the oldest last access date is file C. In such a state, for example, when a file to be transferred from the first computer to the second computer is selected in the order of the last access date and time, the file C is transferred to the lower tier. However, in the case shown in FIG. 2, the segment A and the segment C constituting the file C are also referred to from the file A. Therefore, even if file C is deleted, segment A and segment C are not deleted from the deduplication storage. As a result, the free capacity of the deduplication storage does not increase.

  As described above, in the tiered storage having the deduplication storage in the upper tier, there is a possibility that the desired free space cannot be secured even if the upper tier file is migrated to the lower tier according to the access situation. There was a problem of being.

  Therefore, an object of the present invention is that in a tiered storage having deduplication storage in the upper tier, there is a possibility that the desired free capacity cannot be secured even if the upper tier file is migrated to the lower tier. To provide a file control device, a file control method, and a program that solve the above problem.

In order to achieve such an object, a file control apparatus according to one aspect of the present invention provides:
A first storage device that stores a file by performing deduplication processing that does not newly store a data unit that has already been stored among data units included in a file that includes one or a plurality of data units, and stores the file A file to be transferred to the second storage device that stores the file to be transferred from the first storage device is selected, and the selected file is transferred from the first storage device to the second storage device. Having transition means for transitioning to the device;
The migration means changes from the first storage device to the second storage device based on reference number information indicating a reference number that is the number of files referring to the data unit in the first storage device. Select the file to be migrated.

In addition, a file control method according to another aspect of the present invention includes:
A first storage device that stores a file by performing deduplication processing that does not newly store a data unit that has already been stored among data units included in a file that includes one or a plurality of data units, and stores the file A file to be transferred to the second storage device that stores the file to be transferred from the first storage device is selected, and the selected file is transferred from the first storage device to the second storage device. To the equipment,
When transferring a file from the first storage device to the second storage device, a reference number which is the number of files stored in the first storage device referring to the data unit is indicated. Based on the reference number information, a file to be transferred from the first storage device to the second storage device is selected.

Moreover, the program which is the other form of this invention is:
In the information processing device,
A first storage device that stores a file by performing deduplication processing that does not newly store a data unit that has already been stored among data units included in a file that includes one or a plurality of data units, and stores the file A file to be transferred to the second storage device that stores the file to be transferred from the first storage device is selected, and the selected file is transferred from the first storage device to the second storage device. Realize the migration means to migrate to the device,
The migration means is configured to change the second storage unit from the first storage device based on reference number information indicating a reference number that is the number of files stored in the first storage device referring to the data unit. Is a program for realizing a process of selecting a file to be transferred to the storage device.

  By configuring the present invention as described above, in a tiered storage having a deduplication storage in the upper tier, it is possible to secure a free space as desired even if the upper tier file is migrated to the lower tier. It is possible to provide a file control device, a file control method, and a program that solve the problem that there is a possibility of being impossible.

It is a figure which shows the outline | summary of a hierarchical storage. It is a figure which shows the outline | summary of a deduplication storage. 1 is a block diagram illustrating an example of a configuration of a storage system according to a first embodiment of this invention. It is a figure which shows an example of the file list shown in FIG. It is a figure which shows an example of the segment reference number information shown in FIG. 5 is a flowchart illustrating an example of processing when a file selection unit selects a file in the first embodiment of the present invention. It is an example of the file list which has the segment of the reference number 1 which the file selection means produced | generated. It is a block diagram which shows an example of a structure of the storage system which is the 2nd Embodiment of this invention. It is a figure which shows an example of the file list shown in FIG. It is a figure which shows an example of the segment reference number information shown in FIG. It is a flowchart which shows an example of the process at the time of the 2nd Embodiment of this invention when a file selection means selects a file. It is an example of the file list which has the segment of the reference number 1 which the file selection means in 2nd Embodiment produced | generated. It is an example of the file list which has the segment of the reference number 2 which the file selection means in 2nd Embodiment produced | generated. It is a block diagram which shows an example of a structure of the storage system which is the 3rd Embodiment of this invention. It is a figure which shows an example of the file list shown in FIG. It is a figure which shows an example of the segment reference number information shown in FIG. It is a flowchart which shows an example of the process at the time of the 3rd Embodiment of this invention when a file selection means selects a file. It is an example of the file list which the file selection means in 3rd Embodiment sorted. It is an example of the file list which has the segment of the reference number 1 which the file selection means in 3rd Embodiment produced | generated. It is a block diagram which shows an example of a structure of the file control apparatus which is the 4th Embodiment of this invention.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a block diagram illustrating an example of the configuration of the storage system according to the first embodiment of this invention. FIG. 4 is a diagram illustrating an example of the file list 341. FIG. 5 is a diagram illustrating an example of the segment reference number information 342. FIG. 6 is a flowchart showing an example of processing when the file selection unit 321 selects a file. FIG. 7 shows an example of a file list having a reference number 1 segment generated by the file selection unit 321.

  In the first embodiment, a storage apparatus 3 having a hierarchical storage that stores a file composed of one or a plurality of segments will be described. The storage device 3 in this embodiment includes a high-order Tier storage 34 that is a high-speed storage with a high unit capacity, a low-order Tier storage 35 that is a storage with a lower read / write speed than the upper Tier storage 34 but a low unit capacity, have. The storage device 3 stores the file in the upper tier storage 34 in response to a request from the server 2 or the like. Further, the storage device 3 causes the hierarchy management unit 32 having the file selection unit 321 to transfer the file stored in the upper Tier storage 34 to the lower Tier storage 35 in a predetermined case such as when a predetermined condition is satisfied. As will be described later, the file selection unit 321 described in the present embodiment refers to the segment reference number information 342 indicating the reference number, which is the number of files referring to the segment, from the upper Tier storage 34 to the lower Tier storage. A file to be transferred to 35 is selected. A segment indicates a data unit constituting a file.

  FIG. 3 shows an example of the configuration of a storage system that is a system including the storage apparatus 3. Referring to FIG. 3, the storage system according to this embodiment includes a management terminal 1, a server 2, and a storage device 3.

  As shown in FIG. 3, the management terminal 1 and the storage apparatus 3 are connected so as to communicate with each other. The server 2 and the storage device 3 are connected so as to communicate with each other.

  The management terminal 1 is an information processing apparatus that manages the storage apparatus 3. The management terminal 1 performs overall management of the storage apparatus 3 such as transmitting an operation start instruction or an operation stop instruction to the storage apparatus 3. The management terminal 1 may be configured to transmit a file migration instruction that instructs the storage device 3 to migrate the file stored in the upper Tier storage 34 to the lower Tier storage 35. In addition, the management terminal 1 stores the desired reserved capacity information indicating the number of segments desired to be secured in the upper tier storage 34 by the file migration (indicating the desired capacity to be secured) together with the file migration instruction. 3 may be configured to transmit.

  The server 2 is an information processing device that accesses data in the storage device 3. The server 2 transmits various requests such as a write request for requesting file writing and a read request for requesting file reading to the storage apparatus 3.

  In the present embodiment, specific configurations of the management terminal 1 and the server 2 are not particularly limited. The management terminal 1 and the server 2 may have various configurations other than those exemplified above.

  The storage device 3 is a hierarchical storage having an upper tier storage 34 and a lower tier storage 35. For example, the storage device 3 stores the file in the upper Tier storage 34 in response to a request from the server 2 or the like. In addition, the storage device 3 shifts the file stored in the upper Tier storage 34 to the lower Tier storage 35 in a predetermined case such as when a predetermined condition is satisfied.

  Referring to FIG. 3, the storage apparatus 3 includes a storage management unit 31, a tier management unit 32 (migration unit) having a file selection unit 321, a deduplication management unit 33, an upper tier storage 34, and a lower tier storage 35. And have. For example, the storage device 3 includes a calculation device such as a CPU (Central Processing Unit) (not shown) and a storage device, and the calculation device executes the program stored in the storage device, whereby each processing means To realize.

  The storage management unit 31 comprehensively manages the storage device 3. For example, the storage management unit 31 receives various instructions such as an operation start instruction, an operation stop instruction, and a file migration instruction from the management terminal 1. The storage management unit 31 receives various requests such as a read request and a write request from the server 2. Then, the storage management unit 31 gives a necessary instruction to the hierarchy management unit 32, for example, so as to execute processing according to the received instruction or request. The storage management means 31 can adopt a known configuration. Therefore, details of the configuration of the storage management unit 31 are omitted.

  The tier management means 32 performs tier management of the upper tier storage 34 and the lower tier storage 35. For example, when writing a file in response to an instruction from the storage management unit 31, the tier management unit 32 performs processing to write the file to be written to the upper Tier storage 34. That is, the hierarchy management unit 32 writes the file to be written to the upper Tier storage 34 via the deduplication management unit 33 in a state where the file to be written is deduplicated. Further, the hierarchy management means 32 migrates the file stored in the upper Tier storage 34 to the lower Tier storage 35 in a predetermined case such as when a predetermined condition is satisfied. In addition, for example, when there is a read request for a file stored in the lower tier storage 35 from the server 2 or the like, the hierarchy management unit 32 converts the file stored in the lower tier storage 35 into the upper tier storage. 34.

  For example, the hierarchy management unit 32 instructs the file selection unit 321 to select a file to be transferred from the upper Tier storage 34 to the lower Tier storage 35 in a predetermined case such as when a predetermined condition is satisfied. At this time, the tier management unit 32 transmits to the file selection unit 321 desired reserved capacity information indicating the number of segments to be transferred from the upper tier storage 34 to the lower tier storage 35 together with the above instruction. In response to the instruction, the file selection unit 321 selects one or more files that satisfy the capacity indicated by the desired reserved capacity information, and outputs a migration file list indicating the selected file to the hierarchy management unit 32. Thereafter, the hierarchy management unit 32 migrates the file indicated by the migration file list output by the file selection unit 321 from the upper Tier storage 34 to the lower Tier storage 35. In other words, the hierarchy management unit 32 stores the file indicated by the migration file list in the lower tier storage 35 and deletes the migration target file from the upper tier storage 34. At this time, the hierarchy management unit 32 deletes, from the upper tier storage 34, segments that are not referred to by files other than the deletion target file among the segments constituting the file.

  In the present embodiment, there is no particular limitation as to when the tier management unit 32 makes the determination to transfer the file stored in the upper tier storage 34 to the lower tier storage 35. For example, when the capacity used by the upper tier storage 34 exceeds a predetermined threshold, or when the free capacity of the upper tier storage 34 falls below a predetermined threshold, the tier management unit 32 The tier storage 34 is migrated to the lower tier storage 35. Further, when receiving a file migration instruction from the management terminal 1, the hierarchy management unit 32 migrates the file from the upper Tier storage 34 to the lower Tier storage 35. In other words, a predetermined case such as a predetermined predetermined condition is satisfied. For example, when the capacity used by the upper Tier storage 34 exceeds a predetermined threshold, the free capacity of the upper Tier storage 34 is determined in advance. When the value is equal to or less than a predetermined threshold, when a file migration instruction is received from the management terminal 1, it indicates one or more of them. The predetermined case such as satisfying a predetermined predetermined condition may be other than the case exemplified above, for example, at a predetermined predetermined interval or in a time zone when the server 2 is less accessed. .

  Further, in the present embodiment, there is no particular limitation on how the hierarchy management unit 32 determines the number of segment transitions indicated by the desired reserved capacity information. The tier management unit 32 may determine the number of segments to be transferred in accordance with, for example, the capacity or free capacity being used by the upper tier storage 34, or the degree of deviation between the capacity or free capacity and a predetermined threshold. I can do it. The number of segment transitions indicated by the desired reserved capacity information may be constant. The number of segment transitions indicated by the desired reserved capacity information may be the number instructed from the management terminal 1.

  The file selection unit 321 selects a file to be migrated from the upper Tier storage 34 to the lower Tier storage 35 in accordance with an instruction from the hierarchy management unit 32, and outputs a migration file list indicating the selected file to the hierarchy management unit 32. To do. As will be described later, the file selection unit 321 uses the file list 341 and the segment reference number information 342 stored in the upper Tier storage 34 when selecting a file. Details of the file selection process performed by the file selection unit 321 will be described later.

  The deduplication management unit 33 stores the file requested to be written by the hierarchy management unit 32 in the upper tier storage 34 in a deduplicated state. That is, the deduplication management unit 33 writes only the segments that are not stored in the upper tier storage 34 among the files to be written to the upper tier storage 34 and newly writes the segments that are already stored in the upper tier storage 34. Absent.

  In the present embodiment, specific processing when the deduplication management unit 33 performs deduplication is not particularly limited. For example, the deduplication management unit 33 calculates the hash value of the segment data and compares it with the hash value of the segment already stored in the upper Tier storage 34, so that the segment to be stored has already been stored in the upper Tier storage 34. Check if it is secured. As described above, the deduplication management unit 33 can be configured to perform a general process for performing deduplication.

  The upper tier storage 34 is a high-speed but high-capacity storage device such as a solid state drive (SSD). The upper tier storage 34 stores a file to be stored in a state where deduplication is managed by the deduplication management unit 33.

  The upper tier storage 34 stores a file list 341 and segment reference number information 342. The file list 341 and the segment reference number information 342 are updated by the deduplication management unit 33 or the like when, for example, storing a file in the upper Tier storage 34 or deleting a file from the upper Tier storage 34.

  The file list 341 shows a list of files stored in the upper tier storage 34. FIG. 4 is an example of the file list 341. Referring to FIG. 4, in the file list 341, for example, the file name, the last access date and time, and the reference segment are associated with each other.

  Specifically, for example, in the first line of FIG. 4, the file name “File 1”, the last access date “2017/07/07 12:34:56”, and the reference segment “A, B” are It is associated. That is, in the first line of FIG. 4, the last access date and time to the file with the file name “File 1” is “2017/07/07 12:34:56”, and the file with the file name “File 1” It shows that it is composed of “A” and segment “B”. For example, in the second line of FIG. 4, the file name “File 2”, the last access date “2017/02/02 03:04:05”, and the reference segment “D” are associated with each other. 4, the file name “File 3”, the last access date “2017/05/05 06:07:08”, and the reference segment “C” are associated with each other. For example, in the fourth line of FIG. 4, the file name “File 4”, the last access date “2017/01/01 02:03:04”, and the reference segment “A, B, C” correspond to each other. In the fifth line of FIG. 4, the file name “File 5”, the last access date “2017/03/03 07:08:09”, and the reference segment “A, E” are associated with each other. ing.

  As described above, the file list 341 includes information indicating the last access date and time of each file, information indicating a segment referred to by each file, and the like.

  The segment reference number information 342 indicates the reference number indicating the number of files referring to the segment for each segment stored in the upper Tier storage 34. FIG. 5 is an example of the segment reference number information 342. Referring to FIG. 5, in the segment reference number information 342, for example, a segment and a reference number are associated with each other.

  Specifically, for example, in the first line of FIG. 5, the segment “A” is associated with the reference number “3”. That is, the first line in FIG. 5 indicates that the number of files referring to the segment “A” is “3”. Further, for example, in the second line in FIG. 5, the segment “B” is associated with the reference number “2”, and in the third line in FIG. 5, the segment “C” and the reference number “2” are associated. Are associated with each other. Further, for example, in the fourth line in FIG. 5, the segment “D” is associated with the reference number “1”, and in the fifth line in FIG. 5, the segment “E” and the reference number “1” are associated. Are associated with each other.

  The lower tier storage 35 is a storage device with a low unit capacity, such as near-line storage or tape storage. The read / write speed of the lower Tier storage 35 is lower than the read / write speed of the upper Tier storage 34. The lower tier storage 35 stores a file transferred from the upper tier storage 34 by the hierarchy management means 32.

  The lower tier storage 35 stores a file list 351. The file list 351 is updated by the hierarchy management unit 32 or the like when storing a file in the lower tier storage 35 or deleting a file from the lower tier storage 35, for example.

  The file list 351 shows a list of files stored in the lower tier storage 35. The configuration of the file list 351 includes, for example, information indicating the last access date and time, like the file list 341 described with reference to FIG. On the other hand, the file list 351 does not include a configuration corresponding to the reference segment of the file list 341. Thus, the file list 351 has a configuration corresponding to a part of the configuration of the file list 341.

  The above is an example of the configuration of the storage system. Next, an example of processing when the file selection unit 321 selects a file to be transferred from the upper Tier storage 34 to the lower Tier storage 35 will be described with reference to FIG. In the following, the number of segment transitions (desired reserved capacity) indicated by the desired reserved capacity information is “2”, the file list 341 stores the contents shown in FIG. 4, and the segment reference number information 342 is shown in FIG. An example of the operation of the file selection unit 321 when the content indicated by 5 is stored will be described.

  The file selection unit 321 is instructed by the hierarchy management unit 32 to select, for example, a file to be transferred from the upper Tier storage 34 to the lower Tier storage 35 together with the desired capacity securing information.

  In response to the instruction, the file selection unit 321 acquires the file list 341 and the segment reference number information 342 stored in the upper Tier storage 34. Then, the file selection unit 321 selects a file having a segment with the reference number “1” indicated by the segment reference number information 342 from all the files indicated by the file list 341, and the reference number “1” as shown in FIG. 'Is created (step S101).

  For example, referring to FIG. 5, the segments with the reference number “1” are the segment “D” and the segment “E”. Therefore, the file selection unit 321 selects the file with the file name “File 2” having the segment “D” and the file with the file name “File 5” having the segment “E” from the file list shown in FIG. As a result, the file selection unit 321 creates a list of files having segments with the reference number “1” as shown in FIG.

  Subsequently, the file selection unit 321 selects one file according to the file order of the file list having the segment of the reference number “1” shown in FIG. 7 and adds it to the moving file list (step S102). For example, in the case shown in FIG. 7, the file selection unit 321 adds information corresponding to the file name “File 2” to the movement file list.

  Subsequently, the file selection unit 321 compares the total number of segments of the reference number “1” in the movement file list with the desired reserved capacity indicated by the desired reserved capacity information. At this stage, the moving file list has only information on the file with the file name “File 2”. Further, the number of segments of the reference number “1” that the file with the file name “File2” has is 1 (segment “D”). Therefore, at the present stage, the total number of segments of the reference number “1” in the moving file list is “1”, which is less than two segments of the desired reserved capacity. As described above, when the number of segments having the reference number 1 in the moving file list is smaller than the desired reserved capacity (No in step S103), the file selection unit 321 performs the process in step S102 again. That is, the file selection unit 321 selects another file according to the file order of the file list having the segment of the reference number “1” shown in FIG. 7 and adds it to the moving file list (step S102). In the case illustrated in FIG. 7, the file selection unit 321 adds information corresponding to the file name “File 5” to the movement file list.

  By adding information corresponding to the file name “File 5” to the move file list, the move file list has information about the file with the file name “File 2” and information about the file with the file name “File 5”. Will be. As a result, the total number of segments of the reference number “1” in the moving file list is “2”, which is two or more segments of the desired reserved capacity. As described above, when the number of segments having the reference number 1 in the moving file list is equal to or larger than the desired secured capacity (step S103, Yes), the file selecting unit 321 outputs the moving file list to the hierarchy managing unit 32. That is, in the state described this time, the file selection unit 321 sends the moving file list having information about the file with the file name “File 2” and information about the file with the file name “File 5” to the hierarchy management unit 32. And output (step S104). Then, the file selection unit 321 ends the process.

  Thereafter, as described above, the hierarchy management unit 32 stores the file indicated by the migration file list in the lower Tier storage 35 and deletes the migration target file from the upper Tier storage 34. In this way, by deleting the files listed in the migration file list by the hierarchy management means 32, it is possible to secure a 2-segment vacancy of the desired reserved capacity.

  The above is an example of processing when the file selection unit 321 selects a file to be transferred from the upper Tier storage 34 to the lower Tier storage 35.

  As described above, the storage apparatus 3 according to the present embodiment includes the hierarchy management unit 32 including the file selection unit 321. With this configuration, the file selection unit 321 can select a file to be transferred from the upper tier storage 34 to the lower tier storage 35 based on the file list 341 and the segment reference number information 342. Further, the hierarchy management unit 32 can migrate the file selected by the file selection unit 321 from the upper Tier storage 34 to the lower Tier storage 35. As a result, only a file having a segment whose reference number is “1” can be set as a migration target. Thus, by deleting the file from the upper tier storage 34, it becomes possible to delete the segment from the upper tier storage 34 with certainty, and even if the file in the upper tier storage 34 is migrated to the lower tier storage 35, the desired space is available. It is possible to solve the problem that the capacity cannot be secured.

  Note that the configuration exemplified in this embodiment is merely an example. The configuration of the storage system to which the present invention is applied is not limited to the case described above.

  For example, in the present embodiment, the storage device 3 has a two-stage storage device of an upper tier storage 34 and a lower tier storage 35. However, the storage device 3 may be composed of storage devices with three or more levels, for example, having storages of Tier 1, Tier 2, and Tier 3. In the case of having a multi-level hierarchy in this way, for example, the present invention may be applied when a file is migrated from a higher hierarchy to a lower hierarchy.

  In the present embodiment, the storage apparatus 3 includes the upper tier storage 34 and the lower tier storage 35. However, the configuration corresponding to the upper tier storage 34 and the lower tier storage 35 may be provided outside the storage device 3, for example. Thus, the storage apparatus 3 does not necessarily have to be one information processing apparatus. In the present embodiment, the storage device 3 is different from the management terminal 1 and the server 2. However, the storage apparatus 3 may be configured integrally with either one or both of the management terminal 1 and the server 2.

  Further, the contents stored in the file list 341 and the segment reference number information 342 are not limited to the case exemplified in the present embodiment. In the present embodiment, the case where the file list 341 and the segment reference number information 342 are tabular data is exemplified. However, the file list 341 and the segment reference number information 342 may store various data with configurations other than those exemplified in the present embodiment as long as the last access date, reference segment, reference number, and the like can be stored. .

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a block diagram showing an example of the configuration of a storage system having the storage apparatus 4. FIG. 9 is a diagram illustrating an example of the file list 441. FIG. 10 is a diagram illustrating an example of the segment reference number information 442. FIG. 11 is a flowchart showing an example of processing when the file selection unit 421 selects a file. FIG. 12 is an example of a file list having a reference number 1 segment generated by the file selection unit 421. FIG. 13 is an example of a file list having a reference number of 2 segments generated by the file selection unit 421.

  In the second embodiment of the present invention, a storage apparatus having file selection means 421 capable of selecting and selecting not only a file having a reference number “1” segment but also a file having a reference number “n” segment. 4 will be described. Even if the file having the reference number “1” does not exist enough to satisfy the desired reserved capacity by selecting and selecting the file having the reference number “n” segment by the file selection unit 421, the desired reserved capacity Can be secured.

  FIG. 8 shows an example of the configuration of the storage system in this embodiment. Referring to FIG. 8, the storage system has a management terminal 1, a server 2, and a storage device 4. Note that in this embodiment, the same reference numerals are given to the same configurations as those described in the first embodiment. In the present embodiment, the description of the same configuration as that of the first embodiment is omitted, and the configuration of the second embodiment will be mainly described.

  The storage device 4 is a hierarchical storage having an upper tier storage 44 and a lower tier storage 35. The storage device 4 has a file selection unit 421 instead of the file selection unit 321 as compared with the storage device 3 described in the first embodiment. Similar to the file selection unit 321, the file selection unit 421 is realized, for example, by executing a program stored in a storage device (not shown) by an arithmetic device (not shown) included in the storage device 4.

  The tier management means 42 tiers the upper tier storage 44 and the lower tier storage 35. The hierarchy management unit 42 performs the same processing as the hierarchy management unit 32 described in the first embodiment. Therefore, detailed description is omitted.

  The file selection unit 421 selects a file to be migrated from the upper tier storage 44 to the lower tier storage 35 in accordance with an instruction from the tier management unit 42, and outputs a migration file list indicating the selected file to the tier management unit 42. To do. As will be described later, the file selection unit 421 uses the file list 441 and the segment reference number information 442 stored in the upper Tier storage 44 when selecting a file. The file selection means 421 in the present embodiment can select and select not only a reference number “1” but also a file having a reference number “n” segment. Details of the file selection process performed by the file selection unit 421 will be described later.

  The upper tier storage 44 is a high-speed storage device with a high unit capacity, such as an SSD (solid state drive). The configuration of the upper tier storage 44 may be the same as that of the upper tier storage 34 described in the first embodiment.

  Similar to the upper tier storage 34 described in the first embodiment, the upper tier storage 44 stores a file list 441 and segment reference number information 442.

  The file list 441 shows a list of files stored in the upper tier storage 44. FIG. 9 is an example of the file list 441. The configuration of the file list 441 is the same as the configuration of the file list 341 described in the first embodiment. Referring to FIG. 9, in the file list 441, for example, the file name, the last access date and time, and the reference segment are associated with each other.

  Specifically, for example, in the first line of FIG. 9, the file name “File 1”, the last access date “2017/07/07 12:34:56”, and the reference segment “A, B” are It is associated. That is, in the first line of FIG. 9, the last access date and time to the file with the file name “File 1” is “2017/07/07 12:34:56”, and the file with the file name “File 1” It shows that it is composed of “A” and segment “B”. For example, in the second line of FIG. 9, the file name “File 2”, the last access date “2017/02/02 03:04:05”, and the reference segment “A, B, C” correspond to each other. In the third line of FIG. 9, the file name “File 3”, the last access date “2017/05/05 06:07:08”, and the reference segment “A, B, C, E” Are associated with each other. For example, in the fourth line of FIG. 9, the file name “File 4”, the last access date “2017/01/01 02:03:04”, and the reference segment “A, B, D” correspond to each other. In the fifth line of FIG. 9, the file name “File 5”, the last access date “2017/03/03 07:08:09” and the reference segment “B, C, E” correspond to each other. It is attached.

  The segment reference number information 442 indicates a reference number indicating the number of files referring to the segment for each segment stored in the upper Tier storage 44. FIG. 10 is an example of the segment reference number information 442. The configuration of the segment reference number information 442 is the same as the configuration of the segment reference number information 342 described in the first embodiment. Referring to FIG. 10, in the segment reference number information 442, for example, a segment and a reference number are associated with each other.

  Specifically, for example, in the first row of FIG. 10, the segment “A” is associated with the reference number “4”. That is, the first line of FIG. 10 indicates that the number of files referring to the segment “A” is “4”. Further, for example, in the second line of FIG. 10, the segment “B” is associated with the reference number “4”, and in the third line of FIG. 10, the segment “C” and the reference number “3” are associated. Are associated with each other. Further, for example, in the fourth line in FIG. 10, the segment “D” is associated with the reference number “1”, and in the fifth line in FIG. 10, the segment “E” and the reference number “2” are associated. Are associated with each other.

  The above is an example of the configuration of the storage system in the second embodiment. As described above, the storage system according to the second embodiment includes the file selection unit 421 instead of the file selection unit 321. Next, an example of processing when the file selection unit 421 selects a file to be transferred from the upper Tier storage 44 to the lower Tier storage 35 will be described with reference to FIG. In the following, the number of segment transitions (desired reserved capacity) indicated by the desired reserved capacity information is “2”, the file list 441 stores the contents shown in FIG. 9, and the segment reference number information 442 is shown in FIG. An example of the operation of the file selection unit 421 when the contents indicated by 10 are stored will be described.

  For example, the file selection unit 421 is instructed by the hierarchy management unit 42 to select a file to be transferred from the upper tier storage 44 to the lower tier storage 35 together with the desired capacity securing information.

  In response to the instruction, the file selection unit 421 acquires the file list 441 and the segment reference number information 442 stored in the upper Tier storage 44. Then, the file selection unit 421 selects a file having a segment having the reference number “1” indicated by the segment reference number information 442 from all the files indicated by the file list 441, and the reference number “1” as illustrated in FIG. 'Is created (step S201). As described above, the file selection unit 421 first creates a list by selecting files having a segment whose reference number is “1” which is the initial value of n.

  For example, referring to FIG. 10, the segment with the reference number “1” is the segment “D”. Therefore, the file selection unit 421 selects the file with the file name “File 4” having the segment “D” from the file list shown in FIG. As a result, the file selection unit 421 creates a list of files having segments with the reference number “1” as shown in FIG.

  Subsequently, the file selection unit 421 selects n files according to the file order of the file list having the segment of the reference number “1” shown in FIG. 12 and adds it to the moving file list (step S202). At the current stage, n = 1. Therefore, the file selection unit 421 selects one file in accordance with the file order of the file list having the segment with the reference number “1” shown in FIG. 12 and adds it to the moving file list. For example, in the case shown in FIG. 12, the file selection unit 421 adds information corresponding to the file name “File 4” to the movement file list.

  Subsequently, the file selection unit 421 compares the total number of segments below the reference number “n (n = 1)” of the movement file list with the desired reserved capacity indicated by the desired reserved capacity information (step S203). At this stage, the moving file list has only information on the file with the file name “File 4”. Further, the number of segments of the reference number “1” that the file with the file name “File4” has is 1 (segment “D”). Therefore, at the present stage, the total number of segments with the reference number “1” or less in the moving file list is “1”, which is less than 2 segments of the desired reserved capacity. As described above, when the number of segments having a reference number of 1 or less in the moving file list is smaller than the desired secured capacity (No in step S203), the file selection unit 421 reaches the end of the list of files having segments with the reference number “1”. It is confirmed whether the sorting process has been performed (step S205).

  When the selection process has not been performed to the end of the list of the file having the segment with the reference number “1” (No at Step S205), the file selection unit 421 performs the process at Step S202 again. On the other hand, in the example illustrated in FIG. 12, only one file with the file name “File 4” is described in the file list having the segment with the reference number “1”. Therefore, at the present stage, the selection process is performed up to the end of the list of the file having the segment with the reference number “1”. As described above, when the selection process is performed up to the end of the list of the file having the segment having the reference number “1” (step S205, Yes), the file selection unit 421 adds 1 to n (step S206) and sets n + 1. A file having a reference number of segments is selected, and a list of files having a reference number “n + 1” is created (step S201). For example, in this case, the file selection unit 421 selects a file having a segment with the reference number “2” obtained by adding 1 to the reference number 1, and creates a list as shown in FIG.

  For example, referring to FIG. 10, the segment with the reference number “2” is the segment “E”. Therefore, the file selection unit 421 selects the file with the file name “File 3” having the segment “E” and the file with the file name “File 5” from the file list shown in FIG. As a result, the file selection unit 421 creates a list of files having segments with the reference number “2” as shown in FIG.

  Subsequently, the file selection unit 421 selects n files in accordance with, for example, the file order of the file list having the segment with the reference number “2” shown in FIG. 13 and adds it to the moving file list (step S202). At the current stage, n = 2. Therefore, the file selection unit 421 selects two files from the file list having the reference number “2” shown in FIG. 12 and adds them to the moving file list. For example, in the case shown in FIG. 13, the file selection unit 421 adds information corresponding to the file name “File 3” and information corresponding to the file name “File 5” to the movement file list. When n is 2 or more, the file selection unit 421 selects a plurality of files at a time. In such a case, it is desirable that the file selection unit 421 selects files having segments corresponding to each other at a time. For example, it is assumed that there are a file 1 and a file 3 having a segment α with a reference number “2”, and a file 2 and a file 4 having a segment β with a reference number “2”. In this case, it is desirable that the file selection unit 421 selects, for example, one of the file 1 and the file 3 having the corresponding segment α, or the file 2 and the file 4 having the corresponding segment β. Which of the segment α and the segment β is selected is determined according to the file order, for example.

  Subsequently, the file selection unit 421 compares the total number of segments below the reference number “n (n = 2)” of the movement file list with the desired reserved capacity indicated by the desired reserved capacity information (step S203). At this stage, the moving file list includes information about the file with the file name “File 4”, information about the file with the file name “File 3”, and information about the file with the file name “File 5”. Therefore, at the present stage, the total number of segments having the reference number “2” or less in the moving file list is “2”, which is two or more segments of the desired reserved capacity. As described above, when the number of segments having the reference number n or less in the moving file list is equal to or larger than the desired secured capacity (step S203, Yes), the file selection unit 421 outputs the moving file list to the hierarchy management unit 42. . That is, in the state described this time, the file selection unit 421 performs the information about the file with the file name “File 3”, the information about the file with the file name “File 4”, and the file with the file name “File 5”. The moving file list having the above information is output to the hierarchy management means 42 (step S204). Then, the file selection unit 421 ends the process.

  The above is an example of processing when the file selection unit 421 selects a file to be transferred from the upper tier storage 44 to the lower tier storage 35.

  As described above, the storage apparatus 4 in this embodiment has the file selection unit 421 instead of the file selection unit 321 described in the first embodiment. With such a configuration, the file selection unit 421 selects a file having segments up to the reference number “n” necessary for securing the desired reserved capacity, and selects the upper Tier storage from the selected files. A file to be transferred from 44 to the lower tier storage 35 can be selected. With such a configuration, it is possible to secure the desired capacity even if the number of files having the reference number “1” does not exist as many as necessary to secure the desired secured capacity. Become. In addition, the file selection unit 421 is configured to repeat the selection of a file having a segment whose reference number is 1 added to the reference number used as a reference for selection until a desired reserved capacity is secured. For this reason, for example, the file selection unit 421 can select a file to be transferred to the desired reserved capacity without selecting a file composed of only a segment whose reference number is uselessly large. As a result, it is possible to reduce the risk of deleting a file unnecessarily in order to secure capacity.

  Note that the configuration illustrated in the present embodiment is merely an example, as in the first embodiment. The storage system described in the second embodiment can be modified in various ways similar to the case described in the first embodiment.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS. FIG. 14 is a block diagram showing an example of the configuration of a storage system having the storage apparatus 5. FIG. 15 is a diagram showing an example of the file list 541. FIG. 16 is a diagram illustrating an example of the segment reference number information 542. FIG. 17 is a flowchart illustrating an example of processing when the file selection unit 521 selects a file. It is an example of the file list which the file selection means 521 sorted. FIG. 19 is an example of a file list having a reference number of 1 segment generated by the file selection means 521.

  In the third embodiment of the present invention, a storage apparatus 5 having a file selection unit 521 that performs a sorting process after sorting (rearranging) the file list 541 in order of oldest access date and time will be described. Since the file selection means 521 sorts the last access date and time in order from the oldest, it is possible to preferentially select the file having the oldest last access date and time.

  FIG. 14 shows an example of the configuration of the storage system in this embodiment. Referring to FIG. 14, the storage system includes a management terminal 1, a server 2, and a storage device 5. In the present embodiment, the same reference numerals are given to the same configurations as those described in the first embodiment or the second embodiment. In the present embodiment, the description of the same configuration as in the first embodiment and the second embodiment is omitted, and the configuration of the third embodiment will be mainly described.

  The storage device 5 is a hierarchical storage having an upper tier storage 54 and a lower tier storage 35. Compared to the storage apparatus 3 described in the first embodiment and the storage apparatus 4 described in the second embodiment, the storage apparatus 5 includes a file selection means 521 instead of the file selection means 321 and the file selection means 421. Have. Similar to the file selection unit 321, the file selection unit 521 is realized by, for example, an arithmetic device (not shown) included in the storage device 5 executing a program stored in a storage device (not shown).

  The tier management means 52 tiers the upper tier storage 54 and the lower tier storage 35. The hierarchy management unit 52 performs the same processing as the hierarchy management unit 32 described in the first embodiment. Therefore, detailed description is omitted.

  The file selection unit 521 selects a file to be migrated from the upper tier storage 54 to the lower tier storage 35 in accordance with an instruction from the tier management unit 52, and outputs a migration file list indicating the selected file to the tier management unit 52. To do. As will be described later, the file selection unit 521 uses the file list 541 and the segment reference number information 542 stored in the upper Tier storage 54 when selecting a file. The file selection unit 521 in the present embodiment performs the selection and selection processing after sorting the file list 541 in the order of the last access date and time. Details of the file selection process performed by the file selection unit 521 will be described later.

  The upper tier storage 54 is a high-speed but high-capacity storage device such as a solid state drive (SSD). The configuration of the upper tier storage 54 may be the same as that of the upper tier storage 34 described in the first embodiment.

  Similar to the upper tier storage 34 described in the first embodiment, the upper tier storage 54 stores a file list 541 and segment reference number information 542.

  The file list 541 shows a list of files stored in the upper tier storage 54. FIG. 15 is an example of the file list 541. The configuration of the file list 541 is the same as the configuration of the file list 341 described in the first embodiment. Referring to FIG. 15, in the file list 541, for example, a file name, a last access date and time, and a reference segment are associated with each other.

  Specifically, for example, in the first line of FIG. 15, the file name “File 1”, the last access date “2017/03/03 07:08:09”, and the reference segment “E” are associated with each other. It has been. That is, in the first line of FIG. 15, the last access date and time to the file with the file name “File 1” is “2017/03/03 07:08:09”, and the file with the file name “File 1” It shows that it is composed of “E”. Further, for example, in the second line of FIG. 15, the file name “File 2”, the last access date “2017/07: 07 12:34:56”, and the reference segment “A, C” are associated with each other. In the third line of FIG. 15, the file name “File 3”, the last access date “2017/05/05 06:07:08”, and the reference segment “A, B” are associated with each other. Yes. Further, for example, in the fourth line of FIG. 15, the file name “File 4”, the last access date “2017/01/01 02:03:04”, and the reference segment “A, B, C” correspond to each other. In the fifth line of FIG. 15, the file name “File 5”, the last access date “2017/02/02 03:04:05”, and the reference segment “D” are associated with each other. .

  The segment reference number information 542 indicates a reference number indicating the number of files referring to the segment for each segment stored in the upper Tier storage 54. FIG. 16 is an example of the segment reference number information 542. The configuration of the segment reference number information 542 is the same as the configuration of the segment reference number information 342 described in the first embodiment. Referring to FIG. 16, in the segment reference number information 542, for example, a segment and a reference number are associated with each other.

  Specifically, for example, in the first line of FIG. 16, the segment “A” is associated with the reference number “3”. That is, the first line in FIG. 16 indicates that the number of files referring to the segment “A” is “3”. Further, for example, in the second line in FIG. 16, the segment “B” is associated with the reference number “2”, and in the third line in FIG. 16, the segment “C” and the reference number “2” are associated. Are associated with each other. For example, in the fourth line in FIG. 16, the segment “D” is associated with the reference number “1”, and in the fifth line in FIG. 16, the segment “E” and the reference number “1” are associated. Are associated with each other.

  The above is an example of the configuration of the storage system in the third embodiment. As described above, the storage system according to the third embodiment includes the file selection unit 521 instead of the file selection unit 321. Next, an example of processing when the file selection unit 521 selects a file to be transferred from the upper Tier storage 54 to the lower Tier storage 35 will be described with reference to FIG. In the following, the number of segment transitions (desired reserved capacity) indicated by the desired reserved capacity information is “1”, the file list 541 stores the contents shown in FIG. 15, and the segment reference number information 542 is shown in FIG. An example of the operation of the file selection unit 521 when the content indicated by 16 is stored will be described.

  For example, the file selection unit 521 is instructed by the hierarchy management unit 52 to select a file to be transferred from the upper Tier storage 54 to the lower Tier storage 35 together with the desired capacity securing information.

  In response to the instruction, the file selection unit 521 acquires the file list 541 stored in the upper tier storage 54. Then, the file selection unit 521 sorts the acquired file list 541 in order of the last access date and time (step S301). As a result, the file list 541 shown in FIG. 15 is rearranged in order of the last access date and time as shown in FIG.

  After the process of step S301, the file selection unit 521 performs the same process as the file selection unit 421 described in the second embodiment. That is, the file selection unit 521 performs the rearrangement process and acquires the segment reference number information 542. Then, the file selection unit 521 selects a file having a segment with the reference number “1” indicated by the segment reference number information 542 from all the files indicated by the file list 541, and the reference number “1” as shown in FIG. ”Is created (step S302). As described above, the file selection unit 421 first creates a list by selecting files having a segment whose reference number is “1” which is the initial value of n.

  For example, referring to FIG. 16, the segments with the reference number “1” are the segment “D” and the segment “E”. Therefore, the file selection unit 421 selects the file with the file name “File 5” having the segment “D” and the file with the file name “File 1” having the segment “E” from the rearranged file list. . As a result, the file selection unit 521 creates a list of files having segments with the reference number “1” as shown in FIG.

  Subsequently, the file selection unit 521 selects n files according to the file order of the file list having the segment of the reference number “1” shown in FIG. 19 and adds it to the movement file list (step S303). At the current stage, n = 1. Therefore, the file selection unit 521 selects one file in accordance with the file order of the file list having the segment with the reference number “1” shown in FIG. 19 and adds it to the moving file list. For example, in the case shown in FIG. 19, the file selection unit 521 adds information corresponding to the file name “File 5” to the movement file list.

  Subsequently, the file selection unit 521 compares the total number of segments equal to or less than the reference number “n (n = 1)” of the movement file list with the desired reserved capacity indicated by the desired reserved capacity information (step S304). At this stage, the moving file list has information about the file with the file name “File 5”. The number of segments of the reference number “1” that the file with the file name “File 5” has is 1 (segment “D”). Therefore, at the present stage, the total number of segments with the reference number “1” or less in the movement file list is “1”, which is one segment or more of the desired reserved capacity. As described above, when the number of segments equal to or smaller than the reference number n of the moving file list is equal to or larger than the desired secured capacity (step S304, Yes), the file selection unit 521 outputs the moving file list to the hierarchy management unit 52. . That is, in the state described this time, the file selection unit 521 outputs a moving file list having information about the file with the file name “File 5” to the hierarchy management unit 52 (step S305). Then, the file selection unit 421 ends the process.

  On the other hand, when the number of segments having a reference number of 1 or less in the moving file list is smaller than the desired reserved capacity (No in step S304), the file selection unit 521 performs a selection process up to the end of the list of files having the reference number “1”. (Step S306). If the selection process has not been performed to the end of the list of the file having the segment with the reference number “1” (No in step S306), the file selection unit 521 performs the process in step S303 again. On the other hand, when the selection processing is performed up to the end of the list of the file having the segment with the reference number “1” (step S306, Yes), the file selection unit 521 adds 1 to n (step S307), and the reference number of n + 1 Are selected, and a list of files having segments with the reference number “n + 1” is created (step S302). Thereafter, the file selection unit 521 performs the same process as the process described above.

  The above is an example of processing when the file selection unit 521 selects a file to be transferred from the upper tier storage 54 to the lower tier storage 35.

  As described above, the storage apparatus 5 in this embodiment has the file selection unit 521 instead of the file selection unit 321 described in the first embodiment and the file selection unit 421 described in the second embodiment. ing. With such a configuration, the file selection unit 521 can sort and select the file list 541 after sorting the file list 541 in order of oldest access date and time. As a result, the file selection unit 521 can preferentially select a file with the oldest access date and time.

  Note that the configuration exemplified in this embodiment is merely an example, as in the first embodiment and the second embodiment. The storage system described in the third embodiment can be modified in various ways similar to those described in the first embodiment and the second embodiment. For example, in the example illustrated in FIG. 17, the case where the file selection unit 421 described with reference to FIG. 11 performs sorting before performing the sorting process is illustrated. However, the file selection unit 521 may be configured to perform sorting before the file selection unit 321 described with reference to FIG. 6 performs selection processing, for example.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 20 is a block diagram showing an outline of the configuration of the file control device 6.

  Referring to FIG. 6, the file control device 6 includes a migration unit 61. For example, the file control device 6 includes an arithmetic device and a storage device (not shown), and the arithmetic unit executes the program stored in the storage device, thereby realizing the transition unit 61.

  The file control device 6 uses the transfer means 61 to transfer the file stored in the first storage device to the second storage device. A file is composed of one or a plurality of data units.

  The first storage device is a storage device that stores a file by performing deduplication processing that does not newly store a data unit that is already stored in the first storage device among the data units included in the file.

  The second storage device is a storage device that stores files transferred from the first storage device. The migration of the file from the first storage device to the second storage device is performed by the migration means 61.

  The transfer means 61 transfers a file to be transferred from the first storage device to the second storage device based on the reference number information indicating the reference number that is the number of files referring to the data unit in the first storage device. The file is selected from the files stored in the first storage device. Then, the transfer unit 61 transfers the selected file from the first storage device to the second storage device.

  As described above, the file control apparatus 6 according to the present embodiment includes the migration unit 61. With such a configuration, the transfer unit 61 performs the second storage from the first storage device based on the reference number information indicating the reference number that is the number of files referring to the data unit in the first storage device. A file to be transferred to the device can be selected from the files stored in the first storage device. As a result, by deleting the file from the first storage device, it becomes possible to delete the corresponding data unit without fail, and the file of the first storage device can be transferred to the second storage device as desired. It is possible to solve the problem that there is a possibility that the free capacity cannot be secured.

  Further, the file control device 6 described above can be realized by incorporating a predetermined program in an information processing device such as the file control device 6. Specifically, a program according to another aspect of the present invention newly stores a data unit that has already been stored among data units included in a file composed of one or more data units in the information processing apparatus. A file that is transferred from the file stored in the first storage device that stores the file by performing deduplication processing that is not transferred to the second storage device that stores the file transferred from the first storage device And a migration unit that migrates the selected file from the first storage device to the second storage device is realized, and the migration unit stores the file stored in the first storage device that refers to the data unit. This is a program for realizing a process of selecting a file to be transferred from the first storage device to the second storage device based on the reference number information indicating the reference number that is the number of.

  Further, the file control method executed by the file control device 6 described above is a deduplication that does not newly store a data unit that is already stored among data units included in a file composed of one or more data units. From among the files stored in the first storage device that performs processing and stores the file, the file to be transferred to the second storage device that stores the file transferred from the first storage device is selected. When the selected file is transferred from the first storage device to the second storage device and the file is transferred from the first storage device to the second storage device, the first data unit is referred to. A method of selecting a file to be transferred from a first storage device to a second storage device based on reference number information indicating a reference number that is the number of files stored in the storage device A.

  Even the invention of the program or the file control method having the above-described configuration can achieve the above-described object of the present invention because it has the same operation as the file control device 6 described above.

  Note that the file control device 6 may be a storage device having at least one of the first storage device and the second storage device.

<Appendix>
Part or all of the above-described embodiment can be described as in the following supplementary notes. The outline of the file control device and the like in the present invention will be described below. However, the present invention is not limited to the following configuration.

(Appendix 1)
A first storage device that stores a file by performing deduplication processing that does not newly store a data unit that has already been stored among data units included in a file that includes one or a plurality of data units, and stores the file A file to be transferred to the second storage device that stores the file to be transferred from the first storage device is selected, and the selected file is transferred from the first storage device to the second storage device. Having transition means for transitioning to the device;
The migration means changes from the first storage device to the second storage device based on reference number information indicating a reference number that is the number of files referring to the data unit in the first storage device. A file control unit that selects files to be migrated.
(Appendix 2)
The file control device according to attachment 1, wherein
The migration unit selects a file including the data unit having the reference number of 1 based on the reference number information, and transfers the first storage device to the second storage device from the selected files. A file controller that selects the files to be migrated.
(Appendix 3)
The file control device according to attachment 2, wherein
The migration means is a reference number obtained by adding 1 to a reference number used as a basis for selection after selecting a selected file as a file to be transferred from the first storage device to the second storage device. A file control device that selects a file including a data unit and selects a file to be transferred from the first storage device to the second storage device from the selected files.
(Appendix 4)
The file control device according to any one of claims 1 to 3, wherein
The migration means performs a process of rearranging the list of files stored in the first storage device based on the last access date and time indicating the date and time when the file was last accessed, and then based on the reference number information A file control device that selects files and selects a file to be transferred from the first storage device to the second storage device from the selected files.
(Appendix 5)
The file control device according to any one of claims 1 to 4, wherein
The migration means is a file control device that selects a file to be migrated from the first storage device to the second storage device in order from the oldest access date of the selected files.
(Appendix 6)
The file control apparatus according to any one of claims 1 to 5, wherein
The file control device, wherein the first storage device is a storage device having a higher read / write speed than the second storage device.
(Appendix 7)
A first storage device that stores a file by performing deduplication processing that does not newly store a data unit that has already been stored among data units included in a file that includes one or a plurality of data units, and stores the file A file to be transferred to the second storage device that stores the file to be transferred from the first storage device is selected, and the selected file is transferred from the first storage device to the second storage device. To the equipment,
When transferring a file from the first storage device to the second storage device, a reference number which is the number of files stored in the first storage device referring to the data unit is indicated. A file control method for selecting a file to be transferred from the first storage device to the second storage device based on reference number information.
(Appendix 8)
The file control method according to appendix 7,
Based on the reference number information, a file including the data unit having the reference number of 1 is selected, and a file to be transferred from the first storage device to the second storage device is selected from the selected files. Yes File control method.
(Appendix 9)
In the information processing device,
A first storage device that stores a file by performing deduplication processing that does not newly store a data unit that has already been stored among data units included in a file that includes one or a plurality of data units, and stores the file A file to be transferred to the second storage device that stores the file to be transferred from the first storage device is selected, and the selected file is transferred from the first storage device to the second storage device. Realize the migration means to migrate to the device,
The migration means is configured to change the second storage unit from the first storage device based on reference number information indicating a reference number that is the number of files stored in the first storage device referring to the data unit. Program that selects files to be transferred to other storage devices.
(Appendix 10)
The program according to appendix 9, wherein
The migration unit selects a file including the data unit having the reference number of 1 based on the reference number information, and transfers the first storage device to the second storage device from the selected files. A program that selects the files to be migrated.

  The programs described in the above embodiments and supplementary notes are stored in a storage device or recorded on a computer-readable recording medium. For example, the recording medium is a portable medium such as a flexible disk, an optical disk, a magneto-optical disk, and a semiconductor memory.

  Although the present invention has been described with reference to the above embodiments, the present invention is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Management terminal 2 Server 3 Storage apparatus 31 Storage management means 32 Hierarchy management means 321 File selection means 33 Deduplication management means 34 Upper Tier storage 341 File list 342 Segment reference number information 35 Lower Tier storage 351 File list 4 Storage apparatus 42 Hierarchy management Means 421 File selection means 44 Upper tier storage 441 File list 442 Segment reference number information 5 Storage device 52 Hierarchy management means 521 File selection means 54 Upper tier storage 541 File list 542 Segment reference number information 6 File control device 61 Migration means

Claims (10)

A first storage device that stores a file by performing deduplication processing that does not newly store a data unit that has already been stored among data units included in a file that includes one or a plurality of data units, and stores the file A file to be transferred to the second storage device that stores the file to be transferred from the first storage device is selected, and the selected file is transferred from the first storage device to the second storage device. Having transition means for transitioning to the device;
The migration means changes from the first storage device to the second storage device based on reference number information indicating a reference number that is the number of files referring to the data unit in the first storage device. A file control unit that selects files to be migrated. The file control device according to claim 1,
The migration unit selects a file including the data unit having the reference number of 1 based on the reference number information, and transfers the first storage device to the second storage device from the selected files. A file controller that selects the files to be migrated. The file control device according to claim 2,
The migration means is a reference number obtained by adding 1 to a reference number used as a basis for selection after selecting a selected file as a file to be transferred from the first storage device to the second storage device. A file control device that selects a file including a data unit and selects a file to be transferred from the first storage device to the second storage device from the selected files. The file control device according to any one of claims 1 to 3, wherein
The migration means performs a process of rearranging the list of files stored in the first storage device based on the last access date and time indicating the date and time when the file was last accessed, and then based on the reference number information A file control device that selects files and selects a file to be transferred from the first storage device to the second storage device from the selected files. The file control device according to any one of claims 1 to 4, wherein:
The migration means is a file control device that selects a file to be migrated from the first storage device to the second storage device in order from the oldest access date of the selected files. The file control device according to any one of claims 1 to 5, wherein:
The file control device, wherein the second storage device is a storage device having a lower read / write speed than the first storage device. A first storage device that stores a file by performing deduplication processing that does not newly store a data unit that has already been stored among data units included in a file that includes one or a plurality of data units, and stores the file A file to be transferred to the second storage device that stores the file to be transferred from the first storage device is selected, and the selected file is transferred from the first storage device to the second storage device. To the equipment,
When transferring a file from the first storage device to the second storage device, a reference number which is the number of files stored in the first storage device referring to the data unit is indicated. A file control method for selecting a file to be transferred from the first storage device to the second storage device based on reference number information. The file control method according to claim 7, wherein
Based on the reference number information, a file including the data unit having the reference number of 1 is selected, and a file to be transferred from the first storage device to the second storage device is selected from the selected files. Yes File control method. In the information processing device,
A first storage device that stores a file by performing deduplication processing that does not newly store a data unit that has already been stored among data units included in a file that includes one or a plurality of data units, and stores the file A file to be transferred to the second storage device that stores the file to be transferred from the first storage device is selected, and the selected file is transferred from the first storage device to the second storage device. Realize the migration means to migrate to the device,
The migration means is configured to change the second storage unit from the first storage device based on reference number information indicating a reference number that is the number of files stored in the first storage device referring to the data unit. Program that selects files to be transferred to other storage devices. The program according to claim 9, wherein
The migration unit selects a file including the data unit having the reference number of 1 based on the reference number information, and transfers the first storage device to the second storage device from the selected files. A program that selects the files to be migrated.

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