METHOD, APPARATUS, PROGRAM AND SYSTEM FOR MIGRATING NAS SYSTEM

• US 20090300081A1
• Filed: 08/08/2008
• Published: 12/03/2009
• Est. Priority Date: 05/28/2008
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: UEOKA, Atsushi
• Granted Patent: US 8,019,726 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 16/119 Details of migration of file systems migration mechanisms in storage systems G06F3/0647

Abstract

In a state where the migration source NAS apparatus is continuously operated, a migration processing program confirms the update date and time of files stored in the migration source NAS apparatus, and migrates only the files that were not updated from a specific time to the start date and time of migration processing. Or, the migration processing program migrates the files stored in the migration source NAS apparatus sequentially from the oldest file. The migration performance is calculated based on the capacity and migration time of the migrated files, and the time required for migrating the non-migrated files is calculated based on the size and migration performance of the non-migrated files.

Claims

1. A file migration method of an information system including a first NAS system, a second NAS system, and a computer for reading and writing a plurality of files stored in the first NAS system,

wherein the file migration method of the information system includes file migration processing, and file migration termination processing to be executed after the execution of the file migration processing;

wherein the file migration processing comprises;

a step of acquiring and storing first attribute information including file names and update time information concerning a plurality of files stored in a designated directory of the first NAS system;

a step of acquiring and storing second attribute information including file names and update time information concerning a plurality of files stored in the second NAS system;

a step of identifying a file to be copied from the first NAS system to the second NAS system based on the difference between the stored first attribute information and second attribute information, and a prescribed rule concerning the update time information of the first attribute information; and

a step of copying the identified file from the first NAS system to the second NAS system; and

wherein the file migration termination processing comprises;

a step of acquiring and storing third attribute information including file names and update time information concerning a plurality of files to be stored in a designated directory of the first NAS system;

a step of acquiring and storing fourth attribute information including file names and update time information concerning a plurality of files stored in the second NAS system based on the file migration processing; and

a step of identifying and copying a file to be copied from the first NAS system to the second NAS system based on the difference between the stored third attribute information and fourth attribute information.

2. The file migration method of an information system according to claim 1,

wherein, based on a first time obtained by subtracting a predetermined migration exclusion update period from the execution time of the file migration processing and the update time information of the first attribute information, the prescribed rule identifies a file updated after the first time as a copy inhibition target.

3. The file migration method of an information system according to claim 1,

wherein the prescribed rule preferentially identifies a file with old update time information of the first attribute information as a file to be copied.

4. The file migration method of an information system according to claim 1,

wherein the acquired first attribute information includes information concerning a WORM setting of a plurality of files stored in a designated directory and below of the first NAS system;

and

wherein the step of copying the identified file from the first NAS system to the second NAS system further includes a step of setting a WORM to the file copied to the second NAS system according to information concerning the WORM setting included in the first attribute information.

5. The file migration method of an information system according to claim 4,

wherein the acquired second attribute information includes information concerning the WORM setting of the file copied to the second NAS system;

and

wherein the file migration method further comprises;

a step of identifying a file set with WORM from the second attribute information; and

a step of excluding the identified file set with WORM from the acquisition target of the first attribute information.

6. The file migration method of an information system according to claim 1,

wherein the step of copying the identified file from the first NAS system to the second NAS system includes a step of recording the copying time and file size of the copied file;

and

wherein the file migration method further comprises;

a step of identifying the total file size concerning files to be copied before the end of migration among a plurality of files stored in a designated directory and below of the first NAS system; and

a step of providing migration period information based on the copying time, the file size and the total file size.

7. The file migration method of an information system according to claim 1,

wherein the file migration processing and file migration termination processing are processed with a second NAS system, or a migration computer connected to a first NAS system and a second NAS system.

8. A migration computer coupled to a first NAS system coupled to a computer, and a second NAS system, for migrating a plurality of files stored in a designated directory and below of the first NAS system to the second NAS system, comprising:

a processor;

an I/O port; and

a storage area;

wherein the storage area further stores;

first attribute information including file names and update time information concerning a plurality of files to be stored in a designated directory of the first NAS system;

second attribute information including file names and update time information concerning a plurality of files stored in the second NAS system; and

a program for causing the processor to identify a file to be copied from the first NAS system to the second NAS system based on the difference between the stored first attribute information and second attribute information, and a prescribed rule concerning the update time information of the first attribute information, and copy the file identified with the I/O port.

9. The migration computer according to claim 8,

wherein, based on a first time obtained by subtracting a predetermined migration exclusion update period from the processing time of the program and the update time information of the first attribute information, the prescribed rule identifies a file updated after the first time as a copy inhibition target.

10. The migration computer according to claim 8,

wherein the prescribed rule preferentially identifies a file with old update time information of the first attribute information as a file to be copied.

11. The migration computer according to claim 8,

wherein the first attribute information includes information concerning a WORM setting of a plurality of files stored in a designated directory and below of the first NAS system;

and

wherein the copying of the identified file from the first NAS system to the second NAS system further includes the setting of a WORM to the file copied to the second NAS system according to information concerning the WORM setting included in the first attribute information.

12. The migration computer according to claim 11,

wherein the acquired second attribute information includes information concerning the WORM setting of the file copied to the second NAS system;

and

wherein the program further;

identifies a file set with WORM from the second attribute information; and

excludes the identified file set with WORM from the acquisition target of the first attribute information.

13. The migration computer according to claim 8,

wherein the copying of the identified file from the first NAS system to the second NAS system of the program includes the recording processing of the copying time and file size of the copied file;

and

wherein the program further;

identifies the total file size concerning files to be copied before the end of migration among a plurality of files stored in a designated directory and below of the first NAS system; and

provides migration period information based on the copying time, the file size and the total file size.

14. A program of a migration computer,

wherein the program causes the migration computer to:

acquire and store first attribute information including file names and update time information concerning a plurality of files to be stored in a designated directory of a first NAS system coupled to the migration computer;

acquire and store second attribute information including file names and update time information concerning a plurality of files stored in the second NAS system coupled to the migration computer;

identify a file to be copied from the first NAS system to the second NAS system based on the difference between the stored first attribute information and second attribute information, and a prescribed rule concerning the update time information of the first attribute information;

copy the identified file from the first NAS system to the second NAS system; and

acquire and store third attribute information including file names and update time information concerning a plurality of files to be stored in a designated directory of the first NAS system;

acquire and store fourth attribute information including file names and update time information concerning a plurality of files stored in the second NAS system; and

identify and copy one or more files to be copied from the first NAS system to the second NAS system based on the difference between the stored third attribute information and fourth attribute information.

15. The program of a migration computer according to claim 14,

wherein, based on a first time obtained by subtracting a predetermined migration exclusion update period from the execution time of the file migration processing and the update time information of the first attribute information, the prescribed rule identifies a file updated after the first time as a copy inhibition target.

16. The program of a migration computer according to claim 14,

wherein the prescribed rule preferentially identifies a file with old update time information of the first attribute information as a file to be copied.

17. The program of a migration computer according to claim 14,

wherein the acquired first attribute information includes information concerning a WORM setting of a plurality of files stored in a designated directory and below of the first NAS system;

and

wherein the copying of the identified file from the first NAS system to the second NAS system further includes the setting of a WORM to the file copied to the second NAS system.

18. The program of a migration computer according to claim 14,

wherein the acquired second attribute information includes information concerning the WORM setting of the file copied to the second NAS system;

and

wherein the program further;

identifies a file set with WORM from the second attribute information; and

excludes the identified file set with WORM from the acquisition target of the first attribute information.

19. The program of a migration computer according to claim 14,

wherein the copying of the identified file from the first NAS system to the second NAS system of the program includes the recording of the copying time and file size of the copied file;

and

wherein the program further;

identifies the total file size concerning files to be copied before the end of migration among a plurality of files stored in a designated directory of the first NAS system with the first attribute information; and

provides migration period information based on the copying time, the file size and the total file size.