JP2669241B2 - Migration processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a migration processing method for managing storage, and more particularly to a migration processing method for transferring user files that have not been used for a long time to a cheaper storage medium.

[0002]

2. Description of the Related Art Conventionally, a migration processing method for performing a storage management method includes a file which has not been used for a long time as a file to be migrated.
Or select the least frequently accessed file,
The migration process continued until a certain file space became available.

Alternatively, all the files that have not been used for a predetermined period of time or all the files that are less frequently accessed than a predetermined frequency are migrated.

[0004]

In the above-mentioned conventional migration processing method, since the size of the file to be migrated is not taken into consideration, there are cases where many files having a small file space must be migrated. There was a problem that it took some time to free up a certain file space.

The present invention has been made in view of the above problems, and an object thereof is to provide a migration processing method in which the migration processing is shortened in consideration of the file size.

[0006]

In order to achieve the above object, the migration processing method of the present invention transfers a user file, which is on a large-capacity disk device and has not been used for a long time, to a cheaper medium. A command processing unit for inputting an amount of space to be migrated and starting a migration process, a directory search unit for searching a directory in the system to extract a migration candidate file, and the extracted directory Unused days processing unit that rounds unused days with a constant, and a sorted record that further has a directory address item using the created unused days and the file size of the file as first and second keys, respectively. And the record editor that creates A record output unit that outputs the sorted records to a sort work file, a sort processing unit that performs sorting using the sort work file, and a record input unit that inputs sorted records one by one after the end of the sort processing. , A data transfer unit that performs a process of inputting the corresponding file indicated by the sort record from the disk device and transferring it to the migration medium until the amount of space given by the command processing unit is reached.

[0007]

According to the migration processing method having the above-described configuration, the directory search section searches all the directories and searches for each terminal in order to secure the space capacity received by the command processing section as a new free space on the disk device. The information of the file corresponding to the node is passed to the sort record creation unit. In response to this, the unused days processing unit rounds the unused days of the file by a certain number, and the record editing unit creates a sort record using the unused days and the file size as keys, and outputs it to the sort work file. After the sort processing by the sort processing unit, the record input unit inputs records one by one, and the data transfer unit reads the file contents from the disk device and writes the file contents in the migration medium.

Thus, by preferentially migrating a file having a long unused period and a large file capacity, the migration process can be completed more quickly.

[0009]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating components of a migration processing method according to an embodiment of the present invention.
FIG. 2 is a diagram showing a format of a sort record, and FIG. 3 shows a schematic flow of processing.

In FIG. 1, reference numeral 10 indicates a directory existing in the disk device, and the user file space is also managed by this directory. 2
A command processing unit 0 inputs a migration start instruction from the console or a user program and a file space capacity to be freed by the migration process, and inputs the amount of space to be migrated to start the migration process.

Reference numeral 30 denotes a migration processing unit. In the migration processing unit 30, 40 is a directory search unit for sequentially searching the directory 10 for files that are candidates for migration.
A sort record creation unit for creating a sort record for determining the priority of a migration candidate file.

In the sort record creation unit 50, 51
Is a constant (7 days or 1)
An unused days processing unit 52 for rounding to zero (0 day, etc.) and a record editing unit 52 for setting a predetermined data item in a sort record. A sort record having a directory address item as a first key and a second key is created. Reference numeral 53 denotes a record output unit that outputs a sorted record to a later-described sort work file 80.

Reference numeral 60 denotes a sort processing unit included in the migration processing unit 30 for performing a known sort process for performing a sort using the sort work file 80. 7
0 is included in the migration processing unit 30, determines a file to be migrated, and transfers a user file in the disk device to a migration medium 90 described later, 71 is included in the file transfer unit 70,
A record input unit 72 for inputting sorted records one by one from the sort work file 80;
And a data transfer unit for transferring the contents of a user file to the migration medium 90. The command processing unit 20 performs a process of inputting the file indicated by the sort record from the disk device and transferring the file to the migration medium. Repeat until the amount of space given is reached.

Reference numeral 80 denotes a sort work file which also serves as an input / output / work file for sort processing, and 90 denotes a migration medium composed of a magnetic tape, a magnetic disk device or the like.

In FIG. 2, reference numeral 100 denotes a record editing unit 5
2 shows the format of the sort record created by Step 2.

Next, the operation of this embodiment will be described with reference to FIGS. 1, 2 and 3.

First, at step 200, the command processing unit 2
0 waits for a migration start instruction and a file space capacity (hereinafter abbreviated as “requested space capacity”) to be freed by the migration process from an input device such as a console or a user program.

When a command is input, the command processing unit 2
0 passes control to the migration processing unit 30 together with the required space capacity.

Next, at step 210, the directory search unit 40 sequentially searches the directory 10 in the disk device to obtain one information of each node. Since the directory search method is not related to the present invention, a known method is used without any particular reference.

In step 220, it is determined whether or not all directories have been searched. If all directories have been searched, step 270 is proceeded to, and if all directories have not been searched, step 230 is proceeded to.

In step 230, if one directory obtained in step 220 is an intermediate directory, the process returns to step 210 to obtain the next directory.

When the obtained directory is a file, the process proceeds to step 240, where the unused days processing unit 51 obtains the number of unused days from the latest reference date and the current date in the directory, and further sets this number of days to a predetermined number. (For example, 7 is used for the week unit, and 30 is used for the month unit, which is determined in advance by the system).

In step 250, the record editing unit 52 uses the number of unused days as the first key, obtains the file size from the corresponding directory and uses this as the second key, and further sets the address in the disk device in which the corresponding directory exists to 1 Create a sort record added as an item. The result is a format like 100 in FIG.

In step 260, the record output unit 53 outputs the sort record created in step 250 to the sort work file 80. This file is a migration candidate file. The process proceeds to step 210 to search for the next file, and the same processing is repeated.

Among them, in step 220, it is determined that the directory search is completed, and the process proceeds to step 270.

In step 270, the sort processing unit 60 uses the sort work file 80 to sort the sort records. As a result, the sorted records are grouped into several types according to the number of unused days, sorted in descending order of unused days, and sorted in descending order of file size for each group.

Next, at step 280, the record input unit 7
1 is a sort record from the sort work file 80
Enter the item.

In step 290, the data transfer section 72 obtains the corresponding directory from the directory 10 using the directory address in the sort record.

In step 300, the address of the disk device where the file exists is obtained from the information of the corresponding directory, and the contents of the file are read.

Subsequently, the contents of the file read in step 310 are written to the migration medium 90.

In step 320, the file space of the file is released. The total value of the released space amount is sequentially accumulated in a predetermined area of the data transfer unit 72.

In step 330, the requested space capacity input in step 200 is compared with the total value of the released space quantity. If the requested space capacity has not been released yet, the flow returns to step 280 to execute the same processing. repeat. If the required space capacity has been released, the migration process ends.

From the above description, files having almost the same number of unused days can be migrated in order from the file having the largest file size.

[0034]

As described above, according to the migration processing method of the present invention, in the case of storage management, if the number of unused days of a file is almost the same, the files are migrated in descending order of the file size. Finish faster. As a result, when there is no space on the disk device and you want to make space for the migration process and secure space on the disk device,
This has the effect of shortening the work interruption time and increasing the work efficiency.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a migration processing method according to an embodiment of the present invention.

FIG. 2 is a diagram showing a format of a sort record.

FIG. 3 is a flowchart illustrating an outline of a migration processing method according to the embodiment;

[Explanation of symbols]

 Reference Signs List 10 directory 20 command processing unit 30 migration processing unit 40 directory search unit 50 sort record creation unit 51 unused days processing unit 52 record editing unit 53 record output unit 60 sort processing unit 70 file transfer unit 71 record input unit 72 data transfer unit 80 Sort work file 90 Migration medium 100 Sort record format

Claims (1)

(57) [Claims] In a migration processing method for transferring a user file that has not been used for a long period of time on a large-capacity disk device to a cheaper medium, the migration processing is performed by inputting the amount of space to be migrated. A command processing unit to be started, a directory search unit for searching a directory in the system to extract a migration candidate file, an unused days processing unit for rounding the number of unused days from the extracted directory by a constant, A record editing unit for creating a sort record having a directory address item further using the number of unused days and the file size of the file as a first key and a second key, respectively, and storing the created sort record in a sort work file. A record output section for outputting, and A sort processing unit that performs sorting using a sort work file, and after the end of the sort processing,
A record input section for inputting sorted records one by one;
A data transfer unit for inputting a file indicated by the sort record from a disk device and transferring the file to a migration medium until the space amount given by the command processing unit is reached. method.