JPH06202925A - Catalog file shifting device - Google Patents

Abstract

PURPOSE:To have a correct access to a file to be shifted based on the catalog information stored in a catalog file even right after the interruption of a shifting job. CONSTITUTION:A shifted side file creating means 32 creates a shifted side file having a name different from a shifting side file and other same attributes on a shifted side medium 23. A catalog information chain relinking means 35 relinks the chain of the catalog information. So that a chain is formed between an entry part 11 served as the entry part of the shifting side file and a volume part 22 having the name of the medium 23 together with a chain formed between an entry part 21 served as the entry part of the shifted side file and the name of a shifting side medium 13. Under such conditions, the proper control is carried out so that the chain is not cut between the entry part having the name of the file to be shifted and the volume part having the name of the medium which stores the data on the file to be shifted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cataloged file migration device for migrating a cataloged file existing on a medium (a medium loaded in an external storage device, such as a magnetic disk) to another medium.

[0002]

2. Description of the Related Art In computer systems, catalog management may be adopted for efficient management of a plurality of files stored in a plurality of media (various technologies have been announced regarding catalog management. (For example, a patent application relating to JP-A-63-296150 (catalog management method)). Then, due to the addition of media and the like, it may be necessary to migrate a cataloged file, which is a file of such catalog management, between media.

Conventionally, a cataloged file migration device for performing this kind of migration work has performed the following processing. In the following description, the cataloged file that is the target of the migration work is called the "migration target file", the migration source medium is called the "migration source medium", and the migration destination medium is called the "migration destination medium". , The migration target file in the migration source medium is called the "migration source file", and the migration target file in the migration destination medium is called the "migration destination file" (the migration source file and the migration destination file are migrated in terms of file name etc. There are times when the target file does not match).

A migration destination file having the same attributes (file format, file capacity, block length, record length, etc.) other than the file name as the migration source file and different file names only is created on the migration destination medium, and the migration destination file is created. File catalog information (information consisting of an entry part for recording the file name of the migration destination file and a volume part for recording the medium name of the medium in which the migration destination file exists) is created in the catalog file.

Data is copied from the migration source file to the migration destination file.

After copying the data in (1), the migration source file and the catalog information of the migration source file are deleted.

Finally, the file name of the migration destination file is changed to the file name of the migration source file in both the file label and the catalog information of the migration destination file.

[0008]

In the conventional cataloged file migration device described above, in the phase from the deletion of the migration source file to the change of the file name of the migration destination file (the process of the process described above and the process of Medium), the entry part having the file name of the file to be migrated and the data of the file to be migrated when the migration work is interrupted due to a system down of the computer system to which the cataloged file migration device is applied. However, there is a drawback in that the chain with the volume part having the medium name is temporarily not present in the computer system. In other words, due to such a situation, the migration target file cannot be accessed, it is considered that the migration target file does not exist on the computer system, or the migration target file becomes unusable. There was a drawback that there is.

In view of the above points, an object of the present invention is to provide a medium of a medium for storing the entry part having the file name of the migration target file and the data of the migration target file in any phase during the migration work of the migration target file. It is possible to secure the existence of a chain with the volume part that has the name, and to strengthen the countermeasures against failures such as system down during the migration work (It is necessary to correctly access the migration target file by the catalog information even immediately after the migration work is interrupted. It is possible to provide a cataloged file transfer device.

[0010]

The cataloged file migration apparatus of the present invention creates a migration destination file on the migration destination medium that has the same attributes as the migration source file except for the file name and differs only in the file name. A migration destination file creating means for creating catalog information of the destination file, and a data copying means for copying data from the migration source file to the migration destination file created by the migration destination file creating means,
File name changing means for changing the file name on the file label of the migration destination file to the file name of the migration source file, and an entry section that was an entry section for the migration source file and a volume section having the medium name of the migration destination medium The file name of the file to be migrated at the time of linking the chains in the catalog information so as to form a chain of the entry part that was the entry part for the chain and the migration destination file and the volume part having the medium name of the migration source medium Catalog information chain reconnecting means for controlling so as not to break the chain between the entry part having the name and the volume part having the medium name of the medium storing the data of the transfer target file, and this catalog information chain reconnecting means After reconnecting the chain with the It has a catalog information deleting means for deleting, and a file label deleting means for deleting the file label of the source file after the reconnecting of the chain by the catalog information chain reconnecting means.

[0011]

The present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the construction of an embodiment of the cataloged file migration device of the present invention.

The cataloged file migration device of this embodiment comprises a file migration control means 31, a migration destination file creation means 32, a data copying means 33, a file name changing means 34, and a catalog information chain linking means 35. ,
The catalog information deleting means 36 and the file label deleting means 37 are included. Further, the cataloged file migration apparatus of the present embodiment uses the catalog file 10 to create catalog information (entry section 11 and volume section 12 and entry section 21 and volume section 22).
The migration source file in the migration source medium 13 and the migration destination file in the migration destination medium 23, which are managed by, are set as the migration target files.

2 and 3 are diagrams for explaining the operation of the cataloged file migration device of this embodiment.

4 (a) and 4 (b) show the environment before and after the migration work performed by the cataloged file migration apparatus of this embodiment (states of the catalog file 10, the migration source medium 13 and the migration destination medium 23). ) Is a diagram showing a specific example of FIG.

FIGS. 5A to 5C are diagrams for explaining the processing of the catalog information chain reconnecting means 35 in detail.

Next, the operation of the cataloged file migration apparatus of this embodiment having the above-mentioned configuration will be described.

As shown in FIG. 4A, a migration source file (a file name is "F1", which is a migration target file before the migration work is performed. This "F1" is a migration target file). Exists) on the migration source medium 13. The catalog information of the migration source file records the entry part 11 recording the file name (F1) of the migration source file and the medium name of the medium in which the migration source file exists (migration source medium 13). And a volume section 12. It should be noted that the entry section 11 has a volume section 12
Has a pointer value indicating the address of the entry section 11 and the volume section 12 depending on the presence of this pointer value.
A chain between and has been realized). This catalog information is recorded in the catalog file 10.

In the following, such a migration target file is migrated from the migration source medium 13 to the migration destination medium 23 (see FIG. 4).
The operation of the cataloged file migration device of this embodiment will be described by taking the case of changing the state of (a) to the state of FIG. 4 (b) as an example.

First, the processing of the migration destination file creating means 32 and the data copying means 33 will be described (see FIG. 2).

The file migration control means 31 for performing overall control of the cataloged file migration device of this embodiment first calls the migration destination file creation means 32.

The migration destination file creating means 32 performs the following processing.

The file label and catalog information of the migration source file are acquired.

Based on these pieces of information, the attributes (file format, file capacity, block length, record length, etc.) other than the migration source file and the file name are the same,
A migration destination file having a different file name (the file name is assumed to be “F2”) is created on the migration destination medium 23.

As the catalog information of the migration destination file, an entry portion 21 (an entry portion that records the file name (F2) of the migration destination file and has a pointer value indicating the address of the volume portion 22) and a volume portion 22 (volume part in which the medium name of the medium in which the migration destination file exists (migration destination medium 23) is recorded).

Next, the file migration control means 31 calls the data copying means 33.

The data copying means 33 copies data from the migration source file to the migration destination file.

Secondly, the processing of the file name changing means 34, the catalog information chain connecting means 35, the catalog information deleting means 36 and the file label deleting means 37 will be described (see FIG. 3).

The file migration control means 31 calls the file name changing means 34.

The file name changing means 34 is the transfer destination medium 2
The file name in the file label of the migration destination file on 3 (file name that was “F2” until then) is changed to the file name of the migration source file (“F1” that is the file name of the migration target file).

Subsequently, the file migration control means 31 calls the catalog information chain connection changing means 35.

Catalog information chain reconnection means 35
Is the entry part 11 regarding the catalog information of the migration source file and the migration destination file in the catalog file 10.
And the chain of the volume unit 12 and the entry unit 21
The chain of the volume unit 22 and the volume unit 22 is reconnected to the chain of the entry unit 11 and the volume unit 22 and the chain of the entry unit 21 and the volume unit 12. That is, the chain of the entry part 11 that was the entry part for the migration source file and the volume part 22 having the medium name of the migration destination medium 23, and the entry part 21 that was the entry part for the migration destination file and the medium of the migration source medium 13 The chains in the catalog information are reconnected so as to form a chain with the volume unit 12 having the name.
At this time, the catalog information chain connecting means 35
A medium storing such an entry part (here, the entry part 11) having the file name (F1) of the migration target file and data of the migration target file (including the file label having the file name of the migration target file) A medium for storing a file that has a file name of the migration source medium 13 and the migration destination medium 23 here, so that the chain with the volume parts having the medium names (here, the volume part 12 and the volume part 22) is not broken. Control.

Further, the file migration control means 31 calls the catalog information deletion means 36.

The catalog information deleting means 36 chains the entry part 21 and the volume part 12 (the volume part indicated by the pointer value in the entry part 21) which has become the catalog information of the migration source file by the above-mentioned chain reconnection. The catalog information of the migration source file at this point is deleted by tracing with.

Finally, the file migration control means 31 calls the file label deletion means 37.

The file label deleting means 37 deletes the file label of the transfer source file on the transfer source medium 13.

After the above migration work is completed,
The state of the catalog information (entry section 11 and volume section 22) of the migration destination file that is the migration target file and the migration destination file on the migration destination medium 23 is as shown in FIG. 4B.

Next, with reference to FIGS. 5A to 5C, regarding the processing of the catalog information chain reconnecting means 35 (the processing of reconnecting the chains in the catalog information of the transfer source file and the transfer destination file) The details will be described.

During the process of the catalog information chain reconnecting means 35, the state of the catalog information in the catalog file 10 changes as shown in FIGS. Each state will be described below.

State 1 (see FIG. 5A): A state before the start of processing by the catalog information chain linking unit 35. In this state, the pointer value in the entry part 11 is a value indicating the address of the volume part 12 (the volume part having the medium name of the migration source medium 13), and the pointer value in the entry part 21 is the volume part 22.
It is a value indicating the address of (the volume part having the medium name of the migration destination medium 23). That is, the entry part 1
1 (entry portion having the file name “F1” of the migration target file) and the volume portion 12 form the catalog information of the migration source file, and the entry portion 21 and the volume portion 22 form the catalog information of the migration destination file. Has been formed.

State 2 (see FIG. 5B): This is a state in the middle of processing by the catalog information chain reconnecting means 35. The catalog information chain reconnection means 35 changes the pointer value in the entry section 11 to a value indicating the address of the volume section 22. As a result, the entry unit 11
The chain between the volume section 12 and the volume section 12 is cut, and a new chain is formed between the entry section 11 and the volume section 22.

State 3 (see FIG. 5C): This is a state after the processing by the catalog information chain reconnecting means 35 is completed. The catalog information chain connecting means 35 is
Similar to the process in FIG. 5B, the pointer value in the entry part 21 is changed to a value indicating the address of the volume part 12. As a result, the entry unit 21 and the volume unit 2
The chain between 2 and 2 is cut, and the entry section 21 is newly added.
A chain is formed between the volume section 12 and the volume section 12. That is, the entry part 21 and the volume part 12 form the catalog information of the migration source file, and the entry part 11 (the entry part having the file name “F1” of the migration target file) and the volume part 22 catalog the migration destination file. Information will be formed.

By changing the chain by the catalog information chain changing means 35 as described above, "the entry part having the file name (F1) of the migration target file and the medium name of the medium for storing the data of the migration target file are provided. It is possible to connect the chains without causing "breaking of the chain with the volume part".

[0044]

As described above, according to the present invention, the entry part having the file name of the migration target file and the medium name of the medium storing the data of the migration target file are set at any phase during the migration work of the migration target file. By ensuring the existence of a chain with the volume section that it has, it becomes possible to correctly access the migration target file via the catalog (via the catalog information) even immediately after the migration work is interrupted due to a system down, etc. This has the effect of strengthening measures against disabilities.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration and the like of an embodiment of the present invention.

FIG. 2 is a diagram for explaining the processing of a migration destination file creating means and a data copying means in FIG.

FIG. 3 is a diagram for explaining processing of a file name changing means, a catalog information chain connecting means, a catalog information deleting means, and a file label deleting means in FIG.

4A is a diagram showing an example of an environment before the migration work carried out by the cataloged file migration device shown in FIG. 1, and FIG. 4B is carried out by the cataloged file migration device shown in FIG. It is a figure which shows an example of the environment after the transition work which is.

FIG. 5 is a diagram for explaining in detail the processing of the catalog information chain reconnection means in FIG.

[Explanation of symbols]

 10 Catalog File 11, 21 Entry Section 12, 22 Volume Section 13 Migration Source Medium 23 Migration Destination Medium 31 File Migration Control Means 32 Migration Destination File Creating Means 33 Data Copying Means 34 File Name Changing Means 35 Catalog Information Chain Linking Means 36 Catalogs Information deleting means 37 File label deleting means

Claims (2)

[Claims] 1. A migration destination file creating means for creating a migration destination file having the same attributes as the migration source file other than the file name and different only in the file name on the migration destination medium, and creating catalog information of the migration destination file. And a data copying means for copying data from the migration source file to the migration destination file created by this migration destination file creation means, and a file for changing the file name on the file label of the migration destination file to the file name of the migration source file The name changing means, the chain of the entry part that was the entry part for the migration source file and the volume part that has the medium name of the migration destination medium, and the entry part that was the entry part for the migration destination file and the medium name of the migration source medium Linking the chain in the catalog information so as to form a chain with the volume section that has The catalog information chain connection that controls so as not to break the chain between the entry part having the file name of the migration target file and the volume part having the medium name of the medium storing the data of the migration target file at that time. Switching means, catalog information deleting means for deleting the catalog information of the migration source file after the chain information is changed by the catalog information chain changing means, and the transfer source file is changed after the chain information is changed by the catalog information chain changing means. And a file label deleting unit that deletes the file label. 2. The pointer value in the entry part which was the entry part for the migration source file is changed to a value indicating the address of the volume part for the migration destination file, and then the pointer in the entry part which was the entry part for the migration destination file. 2. The catalog file transfer device according to claim 1, further comprising the catalog information chain reconnecting means for reconnecting a chain by changing a value to a value indicating an address of a volume part for a transfer source file. .