JP2009157441A - Information processor, file rearrangement method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information processor for automatically discriminating a plurality of storage devices according to access speed, and rearranging respective files in the plurality of storage devices according to the access speed and a file access frequency in each storage device, and to provide a file rearrangement method, and a program. <P>SOLUTION: The information processor includes: a performance test means for carrying out a performance test concerning the respective storage devices so as to acquire data read and write speeds; and a file rearranging means for rearranging the files, based on access frequency information, including the number of reading and writing data to/from the respective files, and read speed and write speed information of the respective storage devices. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an information processing apparatus, a file rearrangement method, and a program for storing each file in one of a plurality of storage media in accordance with the access frequency of the file.

  Conventionally, this type of technology for storing each file in one of a plurality of storage media according to the access frequency of the file (rearranging the file) is described in JP-A-5-307532 (Patent Document 1). There is something that was done.

The file optimization method described in Patent Document 1 is a method applied to a computer system having a group of physical storage devices that are configured in a hierarchy from high speed small capacity to low speed large capacity. Multiple file placement rules that determine the appropriateness of file allocation to each storage device according to the requirements of the storage device and the usage status of the storage device, and functions that quantify the degree of user request and the usage status of the storage device The file allocation rule is selected by referring to the function according to the user's request and the usage status of the storage device, and the file is allocated (rearranged) to the storage device according to the selected file allocation rule. The degree of user request includes the degree of request for high speed and reliability with respect to the file to be stored. According to this file optimization method, it is possible to determine a storage hierarchy to which a file is dynamically allocated according to the user's request level.
JP-A-5-307532

  In the conventional technique, the hierarchization of the storage device group is manually performed in advance by the user. Therefore, when configuring a storage device group or adding a new storage device to the storage device group, the user needs to determine the hierarchy to which each storage device should belong based on the specifications of each storage device. There is. Therefore, the conventional technique requires a very troublesome work for the user.

  In addition, in order to assign each storage device to an appropriate hierarchy, a dedicated engineer is generally required, so that the conventional technology cannot be easily introduced.

  The present invention has been made in consideration of the above-described circumstances, and a plurality of storage devices can be automatically distinguished from each other according to the access speed, and according to the access speed of each storage device and the access frequency of the file. An object of the present invention is to provide an information processing apparatus, a file rearrangement method, and a program that can rearrange each file in a plurality of storage devices.

  An information processing apparatus according to the present invention is an information processing apparatus configured to be able to relocate each file to one of a plurality of storage devices according to the access frequency of the file in order to solve the above-described problem, Performance test means for acquiring a data reading speed and a writing speed by performing a performance test for each of the plurality of storage devices, and access including information on the number of times of reading and writing of each file File relocation means for relocating the file based on frequency information and information on the read speed and write speed of each of the plurality of storage devices. is there.

  On the other hand, the file rearrangement method according to the present invention is a file rearrangement method for rearranging each file in one of a plurality of storage devices in accordance with the access frequency of the file in order to solve the above-described problem, For each of the plurality of storage devices, obtaining a data reading speed and a writing speed by performing a performance test, and an access frequency including information on the number of times of reading and the number of times of writing for each file Relocating the file based on information and information on the reading speed and writing speed of each of the plurality of storage devices.

  Furthermore, in order to solve the above-described problem, the program according to the present invention is a program for causing a computer to relocate each file to one of a plurality of storage devices in accordance with the access frequency of the file. In addition, for each of the plurality of storage devices, a step of acquiring a data reading speed and a writing speed by performing a performance test, and an access including information on the number of times of reading and writing of each file And a step of rearranging the files based on the frequency information and the read speed and write speed information of each of the plurality of storage devices.

  According to the information processing apparatus, the file rearrangement method, and the program according to the present invention, a plurality of storage devices can be automatically distinguished from each other according to the access speed, and the access speed and file access frequency of each storage device can be determined. Accordingly, each file can be rearranged in a plurality of storage devices.

  Embodiments of an information processing apparatus, a file rearrangement method, and a program according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic overall configuration diagram showing an embodiment of an information processing apparatus 10 according to the present invention. In the present embodiment, an information processing apparatus including three storage devices will be described as an example.

  The information processing apparatus 10 includes a CPU 11, a RAM 12, a ROM 13, an operation receiving unit 14, a display output unit 15, a network connection unit 16, a disk control unit 17, a storage device group 20, a disk information storage unit 31, an access information storage unit 32, a writing A number storage unit 33 and a threshold storage unit 34 are provided.

  The CPU 11 controls the processing operation of the information processing apparatus 10 according to a program stored in the ROM 13. The CPU 11 loads the disk management program stored in the ROM 13 and data necessary for executing the program into the RAM 12, and automatically sets each storage device constituting the storage device group 20 according to the access speed according to the disk management program. The process of rearranging each file in each storage device is executed according to the access speed and the file access frequency. Further, the CPU 11 loads the virtual file system program stored in the ROM 13 and data necessary for executing the program into the RAM 12, and controls the operation of the disk control unit 17 according to the control by the virtual file system program. To do.

  The CPU 11 functions as at least a file rearrangement unit, a disk information acquisition unit, and an access information acquisition unit by a disk management program. The file rearrangement unit includes a limit number determination unit, a total access number determination unit, a write number determination unit, and a file movement unit. The disk information acquisition unit includes a performance test unit and a disk type acquisition unit. The access information acquisition unit includes an access determination unit, an access file name acquisition unit, an access identification unit, and an access information update unit.

  Each unit uses a required work area of the RAM 12 as a temporary storage location for data. In addition, you may comprise these function implementation parts by hardware logics, such as a circuit, without using CPU11.

  The RAM 12 provides a work area for temporarily storing programs executed by the CPU 11 and data.

  The ROM 13 stores a startup program for the information processing apparatus 10, a disk management program, a virtual file system program, and various data necessary for executing these programs.

  The ROM 13 has a configuration including a recording medium readable by the CPU 11 such as a magnetic or optical recording medium or a semiconductor memory, and a part or all of the programs and data in the ROM 13 are transmitted via an electronic network. It may be configured to be downloaded.

  The operation reception unit 14 is configured by a general input device such as a keyboard, a touch panel, or a numeric keypad, and outputs an operation input signal corresponding to a user operation to the CPU 11.

  The display output unit 15 is configured by a general display output device such as a liquid crystal display or a CRT display, for example, and displays various information according to the control of the CPU 11.

  The network connection unit 16 implements various information communication protocols according to the network form. The network connection unit 16 connects the information processing apparatus 10 and other electrical devices according to these various protocols. For this connection, an electrical connection via an electronic network can be applied. Here, the electronic network means an entire information communication network using telecommunications technology. In addition to a LAN (Local Area Network) and the Internet network, a telephone communication line network, an optical fiber communication network, a cable communication network, and a satellite communication network. Etc.

  The disk control unit 17 is controlled by the CPU 11 to instruct writing and reading of files to and from the storage device group 20 constituting one logical drive under the virtual file system. For example, when there is a file write instruction from the CPU 11, the disk control unit 17 gives a required write instruction to the storage device (physical disk) in which this file is stored, under the control of the CPU 11.

  Here, the virtual file system refers to an application for bundling storage areas of a plurality of storage devices (physical disks) so as to be handled as one logical drive. It can be included in the processing apparatus 10. A logical drive is a virtual storage area (drive). When the virtual file system is applied, the storage areas of the plurality of storage devices are collectively confirmed as one logical drive (storage area) by the user.

  The storage device group 20 includes a high-speed HDD 21 (Hard Disk Drive), a low-speed HDD 22, and an SSD 23 (Solid State Drive) as a storage device with a limited number of writes. The storage device group 20 is controlled by the disk control unit 17, and performs writing and reading with respect to the storage devices 21 to 23 constituting the storage device group 20 in accordance with instructions from the disk control unit 17.

  The high-speed HDD 21 is a hard disk that can write and read data at a higher speed than the low-speed HDD 22. If a frequently accessed file that is frequently written and read is stored in the high-speed HDD 21 rather than the low-speed HDD 22, user convenience is improved.

  The SSD 23 as a storage device with a limited number of times of writing is a storage device using a semiconductor such as a flash memory. The SSD 23 has no seek time. Therefore, it can be said that the storage device is suitable as a storage medium for storing a file to be randomly accessed. However, there is a possibility that the internal element is destroyed by rewriting tens of thousands of times. For this reason, when the SSD 23 is used, it is necessary to provide a write limit number nLIMIT to prevent writing more than this number nLIMIT.

  In the present embodiment, each of the storage devices 21 to 23 constituting the storage device group 20 is recognized and identified by the CPU 11 of the information processing device 10 as disk0, disk1, and disk2, respectively.

  FIG. 2 is an explanatory diagram illustrating an example of information stored in the disk information storage unit 31.

  The disk information storage unit 31 is controlled by the disk information income unit of the CPU 11 and stores the disk information of the storage devices 21 to 23 constituting the storage device group 20. The disk information includes data reading speed and writing speed of each of the storage devices 21 to 23 and information on the type of each of the storage devices 21 to 23. Here, the information of the type of each storage device 21 to 23 is a disk type indicating whether each storage device 21 to 23 is an HDD (hard disk drive) or an SSD 23 (solid state drive) with a write limit number nLIMIT. Information.

  FIG. 3 is an explanatory diagram illustrating an example of access history information stored in the access information storage unit 32.

  The access information storage unit 32 is controlled by the access information acquisition unit of the CPU 11, and for the files stored in the storage device group 20, information on which storage device each file is stored in and the access history for each file Are stored in association with each other. The access history information includes at least the number of times each file has been read and the number of times each file has been written.

  FIG. 4 is an explanatory diagram illustrating an example of information used to make access history information stored in the access information storage unit 32 only within a predetermined period.

  The access history information is used for file relocation by the file relocation unit. It is desirable that the file rearrangement be adapted to the usage situation of the user. Since a history that is too old does not reflect the usage status of the current user, it is preferable not to use an access history after a predetermined period in file relocation.

  In order to identify an access history that has passed a predetermined period, for example, information on the date and time when each access was executed as shown in FIG. 4 may be used. Information including access date and time as shown in FIG. 4 is stored in, for example, a non-volatile storage unit, and by using this information, the access history stored in the access information storage unit 32 shown in FIG. Information can be limited to information within a predetermined period.

  The write count storage unit 33 is controlled by the access information acquisition unit of the CPU 11 and stores the cumulative number n of times the write has been performed on the SSD 23. When there are a plurality of SSDs 23, the cumulative number n of times of writing is stored for each SSD 23.

  The threshold storage unit 34 stores at least first to fourth thresholds N1 to N4 used by the file rearrangement unit. Here, the third threshold value N3 is a margin value for preventing the cumulative number n of writes to the SSD 23 from exceeding the write limit number nLIMIT. In this embodiment, when the cumulative number of writes to the SSD 23 exceeds the value obtained by subtracting the third threshold value N3 from the write limit number nLIMIT, the files are rearranged so that writing to the SSD 23 is not performed as much as possible. .

  Note that some or all of the various types of information stored in the disk information storage unit 31, the access information storage unit 32, the write count storage unit 33, and the threshold storage unit 34 may be stored in a storage device constituting the storage unit group. Good.

  Next, an example of the operation of the information processing apparatus 10 according to the present embodiment will be described.

  First, a procedure for acquiring the disk information of each of the storage devices 21 to 23 will be described in order to automatically distinguish the storage devices 21 to 23 constituting the storage device group 20 from each other according to the access speed.

  FIG. 5 is a flowchart illustrating a procedure when the disk information acquisition unit automatically acquires the disk information of each of the storage devices 21 to 23 constituting the storage device group 20. In FIG. 5, reference numerals with numbers added to S indicate steps in the flowchart.

  The procedure shown in FIG. 5 starts when instructed by the user via the operation reception unit 14 or when it is detected that a preset date has come. Alternatively, it may be started when the process of virtualizing the physical disk starts or ends.

  First, in step S <b> 1, the performance test unit executes an I / O performance test for each of the storage devices 21 to 23 via the disk control unit 17.

  Next, in step S2, the performance test unit acquires data read speed and write speed information of each of the storage devices 21 to 23 obtained as a result of the I / O performance test.

  Next, in step S <b> 3, the performance test unit causes the disk information storage unit 31 to store data read speed and write speed information of each of the storage devices 21 to 23 (see Read and Write in FIG. 2).

  Next, in step S <b> 4, the disk type acquisition unit acquires information on the types (disk types) of the storage devices 21 to 23. Examples of the method for determining the type of each of the storage devices 21 to 23 include a method of using a model number from each of the storage devices 21 to 23. In the case of using the model number, for example, a database in which the model number and the type of the storage device are associated with each other is created in advance on the network, and this database is referred to by the disk type acquisition unit via the network connection unit. If the type of the storage device that matches the model number of each of the storage devices 21 to 23 is extracted, the type of each of the storage devices 21 to 23 can be acquired.

  Next, in step S5, the disk type acquisition unit stores information on the types of the storage devices 21 to 23 in the disk information storage unit 31 (see Type in FIG. 2).

  Through the above procedure, the disk information of the storage devices 21 to 23 constituting the storage device group 20 is automatically acquired, and the storage devices 21 to 23 constituting the storage device group 20 are automatically acquired according to the access speed. Can be distinguished from each other.

  Next, a procedure when the access information acquisition unit acquires information on the history of access to a file will be described.

  FIG. 6 is a flowchart illustrating a procedure when the access information acquisition unit acquires information on the history of access to a file. In FIG. 6, reference numerals with numbers added to S indicate steps in the flowchart.

  First, in step S11, the access determination unit determines whether or not an access to a file stored in the storage unit group has been made. If access has been made, the process proceeds to step S12. On the other hand, if there is no access, it is continuously monitored whether or not each file has been accessed.

  Next, in step S12, the accessed file name acquisition unit acquires the file name of the file to be accessed and information on the storage device in which the file is stored (see the file name and disk name in FIG. 3 or FIG. 4). ).

  Next, in step S13, the access identifying unit identifies whether the access is intended for reading or writing.

  Next, in step S <b> 14, the access information update unit updates information related to the accessed file stored in the access information storage unit 32. For example, when the access to this file is read, the read count is increased by 1 (see FIG. 3). When this access is a write and the storage device storing this file is the SSD 23, the access information update unit further increments the cumulative number of times stored in the write number storage unit 33 by one. Increase times.

  When only the access history within a predetermined period is stored in the access information storage unit 32, first, the type of access and the date and time of this access are associated with each other and stored in the nonvolatile storage unit (FIG. 4). Next, it is preferable to update the information stored in the access information storage unit 32 by aggregating information on accesses to the file within a predetermined period set in advance from the nonvolatile storage unit.

  With the above procedure, information on the history of access to the file can be acquired.

  Next, a procedure for rearranging each file according to the access speed of each storage device 21 to 23 and the access frequency of the file will be described.

  FIG. 7 is a flowchart showing a procedure when the file rearrangement unit rearranges each file according to the access speed of each storage device 21 to 23 and the access frequency of the file. In FIG. 7, reference numerals with numbers added to S indicate steps in the flowchart.

  In the following description, an example in which only the access history within a predetermined period is stored in the access information storage unit 32 will be described.

  The procedure shown in FIG. 7 starts when the user gives an instruction to relocate via the operation reception unit 14 or when it is detected that a preset date has come. The procedure shown in FIG. 7 is repeated for each file to be rearranged.

  First, in step S <b> 21, the limit number determination unit reads the third threshold value N <b> 3 from the threshold value storage unit 34 and the cumulative number of write times n of the SSD 23 from the write number storage unit 33. Then, the limit number determination unit determines whether or not the value obtained by subtracting the third threshold value N3 from the write limit number nLIMIT is equal to or greater than the cumulative number n of writes of the SSD 23. When it is n or more, the process proceeds to step S22. On the other hand, when the cumulative number n of writing to the SSD 23 is larger than the value obtained by subtracting N3 from nLIMIT, the process proceeds to step S27.

  Next, in step S22, the total access count determination unit writes the number of times R and the number of times that a file that is currently being relocated (hereinafter referred to as a target file) is read from the access information storage unit 32 within a predetermined period. The first threshold value N1 is read from the threshold storage unit 34, and the total of the read count R and the written count W (total access count) is greater than the first threshold value N1. To determine. If the total access count R + W is greater than the first threshold N1, the process proceeds to step S23. On the other hand, if the total access count R + W is equal to or smaller than the first threshold N1, the process proceeds to step S26.

  This step S22 makes it possible to distinguish between a file with low access frequency and a file with high access frequency.

  Next, in step S23, the writing number determination unit reads the second threshold value N2 from the threshold value storage unit 34, and whether or not the number of times W that the target file has been written within a predetermined period is greater than the second threshold value N2. To determine. If the number W of times of writing is greater than the second threshold value N2, the process proceeds to step S24. On the other hand, if the number W of times of writing is equal to or smaller than the second threshold value N2, the process proceeds to step S25.

  This step S23 makes it possible to distinguish between a file with a high access frequency and a file with a small number of writes and a file with a large number of writes.

  Next, in step S <b> 24, the file moving unit moves the file to the high speed HDD 21. The file according to step S24 is a file having a large total number of accesses (access frequency) and a large number of writes.

  On the other hand, in step S25, the file moving unit moves the file to the SSD 23. The file according to step S25 is a file with a large total number of accesses and a small number of writes. This type of file can be said to be a file suitable for recording on the SSD 23 having a high reading speed but a limited number of writing.

  On the other hand, in step S <b> 26, the file moving unit moves the file to the low speed HDD 22. The file according to step S26 is a file with a small total number of accesses.

  On the other hand, if it is determined in step S21 that the cumulative number n of data written to the SSD 23 is greater than the value obtained by subtracting N3 from nLIMIT, the number-of-writes determination unit A fourth threshold value N4 smaller than the second threshold value N2 is read from the threshold value storage unit 34, and it is determined whether or not N4 is equal to or greater than W. If the number of times W has been written is greater than the fourth threshold value N4, the process proceeds to step S24. On the other hand, if the number W of times of writing is equal to or less than the fourth threshold value N4, the process proceeds to step S25.

  If the cumulative number of writes n of the SSD 23 is close to the write limit number nLIMIT set in advance in the SSD 23 by steps S21 and S27, the files are rearranged so that a file that is hardly written remains in the SSD 23. It can be performed. If there is no room in the storage capacity of the SSD 23, it is preferable to preferentially leave files that are hardly written to the SSD 23.

  According to the above procedure, each file can be rearranged according to the access speed of each storage device 21 to 23 and the access frequency of the file.

  The information processing apparatus 10 according to the present embodiment performs a performance test on each of a plurality of connected storage devices. For this reason, information on the data reading speed and writing speed (access speed) can be automatically obtained for each of the plurality of storage devices, and the plurality of storage devices are automatically distinguished from each other according to the access speed. be able to. Therefore, this information processing apparatus 10 can be easily introduced without requiring a dedicated engineer.

  Further, the information processing apparatus 10 according to the present embodiment can rearrange files based on the automatically acquired information on the access speed of each storage device and the information on the access frequency of the file. For this reason, it is possible to optimize the file arrangement very easily as compared with the conventional technique in which access speed information needs to be manually input.

  Further, the information processing apparatus 10 according to the present embodiment uses the number of times of writing and the number of times of reading separately for the information on the access frequency used when the file is rearranged. When a storage device that has a limited number of writes, such as the SSD 23 that has been developed recently, is used as a storage device that constitutes the storage unit group, the number of writes reaches the limit for a storage device that has a limited number of writes. In order to avoid this, it is possible to execute the rearrangement of files so that a file with a small number of times of writing is preferentially stored in this type of storage device. Therefore, the information processing apparatus 10 can use a storage device with a limited number of writings as a storage device constituting the storage unit group, and its industrial value is very high.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment.

  Further, in the embodiment of the present invention, each step of the flowchart shows an example of processing that is performed in time series in the order described. The process to be executed is also included.

1 is a schematic overall configuration diagram showing an embodiment of an information processing apparatus according to the present invention. Explanatory drawing which shows an example of the information memorize | stored in a disk information storage part. Explanatory drawing which shows an example of the information of the access history memorize | stored in an access information storage part. Explanatory drawing which shows an example of the information utilized in order to make only the information of the access history memorize | stored in an access information memory | storage part within a predetermined period. The flowchart which shows the procedure at the time of acquiring the disk information of each storage device which comprises a storage device group by a disk information acquisition part. The flowchart which shows the procedure at the time of acquiring the access history information with respect to a file by the access information acquisition part. The flowchart which shows the procedure at the time of rearranging each file according to the access speed of each storage device 21-23 and the access frequency of a file by a file rearrangement part.

Explanation of symbols

10 Information processing apparatus 11 CPU
12 RAM
13 ROM
14 Operation Reception Unit 15 Display Output Unit 16 Network Connection Unit 17 Disk Control Unit 20 Storage Device Group 21 High-speed HDD (disk0)
22 Low-speed HDD (disk1)
23 SSD (disk2)
31 Disk information storage unit 32 Access information storage unit 33 Write count storage unit 34 Threshold storage unit

Claims (14)

An information processing apparatus configured to be able to relocate each file to one of a plurality of storage devices according to the access frequency of the file,
For each of the plurality of storage devices, performance test means for acquiring a data reading speed and a writing speed by performing a performance test;
Based on the access frequency information including information on the number of times read and written about each file, and information on the read speed and write speed of each of the plurality of storage devices, File relocation means for performing relocation;
An information processing apparatus comprising: The file relocation means
For each file, a total access number determination means for determining whether the total number of times read and written is greater than a first threshold;
A writing number determination means for determining whether or not the number of times of writing is greater than a second threshold when the sum of the number of times of reading and the number of times of writing is greater than a first threshold;
Based on the determination results of the total access number determination unit and the write number determination unit, a file moving unit that arranges each file in one of the plurality of storage devices;
The information processing apparatus according to claim 1. Disk type acquisition means for acquiring the type of storage device for each of the plurality of storage devices,
Further comprising
The storage device type includes at least a storage device with a limited number of writes,
The plurality of storage devices include a storage device that has at least a limited number of writes,
The file moving means is
Arranging each of the files so that the number of times the number of times of writing is determined by the writing number determining means is less than or equal to a second threshold is placed in a storage device having a limit on the number of times of writing;
The information processing apparatus according to claim 2. Write number storage means for storing the cumulative number of times the data has been written to the storage device having a limit on the number of writes;
Further comprising
The file relocation means
Limit number determination means for determining whether or not the cumulative number is equal to or less than a value obtained by subtracting a third threshold value from a write limit number of a storage device having a limit on the write number;
Further comprising
The writing number determination means includes
If it is determined by the limit number determination means that the cumulative number is greater than the value obtained by subtracting the third threshold value from the write limit number, the number of times the file has been written is smaller than the second threshold value. To determine whether it is below the threshold of
The file moving means is
Each of the files is preferentially left in a storage device that has a limit on the number of times the file has been determined that the number of times the file has been written by the write number determination means is less than or equal to the fourth threshold value. To place,
The information processing apparatus according to claim 3. For each file, access information storage means for storing the information of the storage device in which each file is currently stored, the read count, and the write count in association with each other;
Access determination means for determining whether or not each file has been accessed;
Access identifying means for identifying whether the access is for reading or writing;
Based on the identification result of the access identification means, an access information update means for updating either the read count or the write count stored in the access information storage means;
The information processing apparatus according to any one of claims 1 to 4, further comprising: A file relocation method for relocating each file to one of a plurality of storage devices according to the access frequency of the file,
Obtaining a data reading speed and a writing speed by performing a performance test for each of the plurality of storage devices;
Based on the access frequency information including information on the number of times read and written about each file, and information on the read speed and write speed of each of the plurality of storage devices, Relocation steps;
A file rearrangement method comprising: The step of rearranging the files includes:
For each file, determining whether the total number of reads and writes is greater than a first threshold;
Determining whether the number of times written is greater than a second threshold if the total number of times read and written is greater than a first threshold;
Placing each of the files in any of the plurality of storage devices based on the determination results of the total access count determination means and the write count determination means;
The file rearrangement method according to claim 6, further comprising: Obtaining a type of storage device for each of the plurality of storage devices;
Further comprising
The storage device type includes at least a storage device with a limited number of writes,
The plurality of storage devices include a storage device that has at least a limited number of writes,
The step of arranging each file in any of the plurality of storage devices includes:
Placing each file such that the number of times the number of times written by the write number determining means is determined to be less than or equal to a second threshold is placed in a storage device having a limit on the number of times written;
The file rearrangement method according to claim 7. Storing the cumulative number of times the data has been written to the storage device having a limited number of times of writing;
Determining whether the cumulative number is equal to or less than a value obtained by subtracting a third threshold from a write limit number of a storage device having a limit on the write number;
If it is determined that the cumulative number is greater than the value obtained by subtracting the third threshold value from the write limit number, is the number of times the file has been written equal to or smaller than a fourth threshold value that is less than the second threshold value? Determining whether or not,
Arranging each of the files such that the file that has been determined that the number of times the file has been written is less than or equal to the fourth threshold remains in a storage device that has a limit on the number of writes;
The file rearrangement method according to claim 8, further comprising: For each file, storing the information on the storage device in which each file is currently stored, the number of times of reading, and the number of times of writing in a storage unit in association with each other;
Determining whether or not each file has been accessed;
Identifying whether the access is intended for reading or writing;
Updating one of the read count and the write count stored in the storage means based on the identification result of the identifying step;
The file rearrangement method according to claim 6, further comprising: A program for causing a computer to relocate each file to one of a plurality of storage devices according to the access frequency of the file,
On the computer,
Obtaining a data reading speed and a writing speed by performing a performance test for each of the plurality of storage devices;
Based on the access frequency information including information on the number of times read and written about each file, and information on the read speed and write speed of each of the plurality of storage devices, Relocation steps;
A program for running The step of rearranging the files includes:
For each file, determining whether the total number of reads and writes is greater than a first threshold;
Determining whether the number of times written is greater than a second threshold if the total number of times read and written is greater than a first threshold;
Placing each of the files in any of the plurality of storage devices based on the determination results of the total access count determination means and the write count determination means;
The program according to claim 11. On the computer,
Obtaining a type of storage device for each of the plurality of storage devices;
Is executed further,
The storage device type includes at least a storage device with a limited number of writes,
The plurality of storage devices include a storage device that has at least a limited number of writes,
The step of arranging each file in any of the plurality of storage devices includes:
Placing each file such that the number of times the number of times written by the write number determining means is determined to be less than or equal to a second threshold is placed in a storage device having a limit on the number of times written;
The program according to claim 12. On the computer,
Storing the cumulative number of times data has been written to the storage device having a limited number of writes;
Determining whether the cumulative number is equal to or less than a value obtained by subtracting a third threshold value from a preset write limit number in a storage device having a limit on the write number;
Determining that the cumulative number of times is greater than a value obtained by subtracting the third threshold from the write limit number, and determining whether the number of times the file has been written is zero;
Each of the files is preferentially left in a storage device in which the number of times the file has been written is less than or equal to a fourth threshold that is less than the second threshold. Placing a step;
14. The program according to claim 13, for further executing

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