OPEN FILE MIGRATION OPERATIONS IN A DISTRIBUTED FILE SYSTEM

• US 20090150449A1
• Filed: 12/07/2007
• Published: 06/11/2009
• Est. Priority Date: 12/07/2007
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Brocade Communications Systems, Inc. (Broadcom, Inc.)
• Inventors: BALASUBRAMANIAN, Ranji, NAIK, Dilip, MCCLANAHAN, Edward D., MARINOV, Borislav
• Granted Patent: US 9,069,779 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
• CPC Class Codes: G06F 16/1744 using compression, e.g. sparse files
• CPC Class Codes: G06F 16/1748 De-duplication implemented within the file system, e.g. based on file segments de-duplication techniques in storage systems for the management of data blocks G06F3/0641
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46

Abstract

In at least some disclosed embodiments, a method includes a) creating a first stub file on a target file server, b) creating a t-stub file at the location of the source directory, c) disabling performance of operations on the source data while allowing completion of operations in progress, d) copying the source data into a hidden directory on the target file server, thus creating target data, e) overwriting the first stub file by renaming the target data, f) enabling performance of operations on the target data, g) performing queued operations on the target data, and h) deleting the source data from the source file server.

Claims

1. A method comprising:

a) creating a first stub file on a target file server, the first stub file created in a target directory, the first stub file pointing to source data in a source directory on a source file server, the source data open for access;

b) creating a t-stub file at the location of the source directory, the t-stub file pointing to the target directory, the source directory allowing access to source data when accessed due to the first stub file;

c) disabling performance of operations on source data while allowing completion of operations in progress;

d) copying source data into a hidden directory on the target file server, thus creating target data;

e) overwriting the first stub file by renaming the target data;

f) enabling performance of operations on the target data;

g) performing queued operations on the target data; and

h) deleting source data from the source file server.

2. The method of claim 1, further comprising deleting the source directory.

3. The method of claim 2, further comprising replacing the t-stub file with a second stub file, the second stub file pointing to the target directory.

4. The method of claim 1, wherein creating the first stub file comprises creating the first stub file on the target file server, the first stub file created in the target directory, the first stub file pointing to the source data in the source directory on the source file server, the source data comprising a file, the file open for access.

5. The method of claim 1, wherein creating the first stub file further comprises creating the first stub file on the target file server, the first stub file created in the target directory, the first stub file pointing to the source data in the source directory on the source file server, the source data comprising multiple files, the multiple files open for access, a), c), d), e), f), g), and h) repeated for each file.

6. The method of claim 1, wherein creating the first stub file comprises creating the first stub file on the target file server, the first stub file created in the target directory, the first stub file pointing to the source data in the source directory on the source file server, the source data comprising multiple files, the multiple files open for access, a), c), d), e), f), g), and h) repeated for each file, the source data comprising a subdirectory.

7. The method of claim 1, wherein creating the first stub file comprises creating the first stub file on the target file server, the first stub file created in the target directory, the first stub file pointing to the source data in the source directory on the source file server, the source data comprising multiple files, the multiple files open for access, a), c), d), e), f), g), and h) repeated for each file, the source data comprising a subdirectory, a), c), d), e), f), g), and h) repeated using the subdirectory as the source directory.

8. The method of claim 6, wherein overwriting the first stub file comprises:

deleting the first stub file; and

renaming the target data such that the target data is accessible in the target directory.

9. The method of claim 1, wherein disabling performance of operations comprises:

rescinding operations in progress that cannot be completed;

sending a close request to the source data;

intercepting access requests for the source data from a client; and

intercepting updates to the source data from the client.

10. The method of claim 9, wherein disabling performance of operations further comprises:

storing state information regarding the source data;

storing lock information regarding the source data; and

storing log information regarding the source data, the log information comprising the access requests and the updates.

11. The method of claim 10, wherein performing queued operations comprises:

applying the state information to the target data;

applying the lock information to the target data; and

applying the log information to the target data.

12. The method of claim 11, wherein enabling performance of operations comprises reissuing rescinded operations.

13. The method of claim 12, wherein enabling performance of operations further comprises sending an open request to the target data.

14. A computer-readable medium storing a software program that, when executed by a processor, causes the processor to:

a) create a first stub file on a target file server, the first stub file created in a target directory, the first stub file pointing to source data in a source directory on a source file server, the source data open for access;

b) create a t-stub file at the location of the source directory, the t-stub file pointing to the target directory, the source directory allowing access to source data when accessed due to the first stub file;

c) disable performance of operations on source data while allowing completion of operations in progress;

d) copy source data into a hidden directory on the target file server, thus creating target data;

e) overwrite the first stub file by renaming the target data;

f) enable performance of operations on the target data;

g) perform queued operations on the target data; and

h) delete source data from the source file server.

15. The computer-readable medium of claim 14, further causing the processor to delete the source directory.

16. The computer-readable medium of claim 15, further causing the processor replace the t-stub file with a second stub file, the second stub file pointing to the target directory.

17. The computer-readable medium of claim 14, wherein creating the first stub file causes the processor to create the first stub file on the target file server, the first stub file created in the target directory, the first stub file pointing to the source data in the source directory on the source file server, the source data comprising a file, the file open for access.

18. The computer-readable medium of claim 14, wherein creating the first stub file causes the processor to create creating the first stub file on the target file server, the first stub file created in the target directory, the first stub file pointing to the source data in the source directory on the source file server, the source data comprising multiple files, the multiple files open for access, a), c), d), e), f), g), and h) repeated for each file.

19. The computer-readable medium of claim 14, wherein creating the first stub file causes the processor to create the first stub file on the target file server, the first stub file created in the target directory, the first stub file pointing to the source data in the source directory on the source file server, the source data comprising multiple files, the multiple files open for access, a), c), d), e), f), g), and h) repeated for each file, the source data comprising a subdirectory.

20. The computer-readable medium of claim 19, wherein creating the first stub file causes the processor to create the first stub file on the target file server, the first stub file created in the target directory, the first stub file pointing to the source data in the source directory on the source file server, the source data comprising multiple files, the multiple files open for access, a), c), d), e), f), g), and h) repeated for each file, the source data comprising a subdirectory, a), c), d), e), f), g), and h) repeated using the subdirectory as the source directory.

21. The computer-readable medium of claim 19, wherein overwriting the first stub file causes the processor to:

delete the first stub file; and

rename the target data such that the target data is accessible in the target directory.

22. The computer-readable medium of claim 14, wherein disabling performance of operations causes the processor to:

rescind operations in progress that cannot be completed;

send a close request to the source data;

intercept access requests for the source data from a client; and

intercept updates to the source data from the client.

23. The computer-readable medium of claim 22, wherein disabling operations on the source data further causes the processor to:

store state information regarding the source data;

store lock information regarding the source data; and

store log information regarding the source data, the log information comprising the access requests and the updates.

24. The computer-readable medium of claim 23, wherein performing queued operations causes the processor to:

apply the state information to the target data;

apply the lock information to the target data; and

apply the log information to the target data.

25. The computer-readable medium of claim 24, wherein enabling performance of operations causes the processor to:

reissue rescinded operations; and

send an open request to the target data.