Method and system for metadata-based resilvering

• US 20070106866A1
• Filed: 04/19/2006
• Published: 05/10/2007
• Est. Priority Date: 11/04/2005
• Status: Active Grant

• Current Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Original Assignee: Sun Microsystems Incorporated (Oracle Corporation)
• Inventors: Ahrens, Matthew, Moore, William, Bonwick, Jeffrey
• Granted Patent: US 8,938,594 B2
• Time in Patent Office: Days
• US Class Current: 711/170
• CPC Class Codes: G06F 11/2082 Data synchronisation

Abstract

A method for resilvering a storage pool includes determining whether any of a first plurality of blocks in the storage pool, comprising metadata, require resilvering, determining whether any of a second plurality of blocks in the storage pool, comprising data, require resilvering, resilvering all of the first plurality of blocks that require resilvering, and resilvering all of the second plurality of blocks that require resilvering, wherein all of the first plurality of blocks that require resilvering are resilvered prior to resilvering any of the second plurality of blocks.

Claims

1. A method for resilvering a storage pool, comprising:

determining whether any of a first plurality of blocks in the storage pool, comprising metadata, require resilvering;

determining whether any of a second plurality of blocks in the storage pool, comprising data, require resilvering;

resilvering all of the first plurality of blocks that require resilvering; and

resilvering all of the second plurality of blocks that require resilvering, wherein all of the first plurality of blocks that require resilvering are resilvered prior to resilvering any of the second plurality of blocks.

2. The method of claim 1, wherein the first plurality of blocks comprises:

a root block;

a third plurality of blocks comprising global file system metadata, wherein the root block references a block in the third plurality of blocks; and

a fourth plurality of blocks comprising file system metadata, wherein a block in the third plurality of blocks references a block in the fourth plurality of blocks.

3. The method of claim 2, wherein the root block is resilvered prior to resilvering any of the third plurality of blocks and the fourth plurality of blocks.

4. The method of claim 3, wherein all of the third plurality of blocks that require resilvering are resilvered prior to resilvering any of the fourth plurality of blocks.

5. The method of claim 1, wherein resilvering all of the first plurality of blocks that require resilvering comprises using a dirty time log (DTL).

6. The method of claim 5, wherein the DTL comprises a birth time corresponding to a transaction group associated with an input/output (I/O) request to store a block in the first plurality of blocks.

7. The method of claim 5, wherein the DTL is associated with a first disk in the storage pool, and wherein resilvering a block in the first plurality of blocks comprises updating the block using data from a second disk in the storage pool.

8. A system, comprising:

a storage pool;

a first plurality of blocks in the storage pool, comprising metadata;

a second plurality of blocks in the storage pool, comprising data; and

a file system configured to;

determine whether any of the first plurality of blocks require resilvering;

determine whether any of the second plurality of blocks require resilvering;

resilver all of the first plurality of blocks that require resilvering; and

resilver all of the second plurality of blocks that require resilvering, wherein all of the first plurality of blocks that require resilvering are resilvered prior to resilvering any of the second plurality of blocks.

9. The system of claim 8, wherein the first plurality of blocks comprises:

a root block;

a third plurality of blocks comprising global file system metadata, wherein the root block references a block in the third plurality of blocks; and

a fourth plurality of blocks comprising file system metadata, wherein a block in the third plurality of blocks references a block in the fourth plurality of blocks.

10. The system of claim 8, wherein the file system resilvers the root block prior to resilvering any of the third plurality of blocks and the fourth plurality of blocks.

11. The system of claim 10, wherein the file system resilvers all of the third plurality of blocks that require resilvering prior to resilvering any of the fourth plurality of blocks.

12. The system of claim 8, further comprising:

a dirty time log (DTL), wherein the file system resilvers all of the first plurality of blocks that require resilvering using the DTL.

13. The system of claim 12, wherein the DTL is configured to store a birth time corresponding to a transaction group associated with an input/output (I/O) request to store a block in the first plurality of blocks.

14. The system of claim 12, further comprising:

a first disk in the storage pool, associated with the DTL and configured to store the first plurality of blocks; and

a second disk in the storage pool, wherein resilvering a block in the first plurality of blocks comprises updating the block using data from the second disk.

15. A computer readable medium comprising executable instructions for resilvering a storage pool by:

determining whether any of a first plurality of blocks in the storage pool, comprising metadata, require resilvering;

determining whether any of a second plurality of blocks in the storage pool, comprising data, require resilvering;

resilvering all of the first plurality of blocks that require resilvering; and

resilvering all of the second plurality of blocks that require resilvering, wherein all of the first plurality of blocks that require resilvering are resilvered prior to resilvering any of the second plurality of blocks.

16. The computer readable medium of claim 15, wherein the first plurality of blocks comprises:

a root block;

a third plurality of blocks comprising global file system metadata, wherein the root block references a block in the third plurality of blocks; and

a fourth plurality of blocks comprising file system metadata, wherein a block in the third plurality of blocks references a block in the fourth plurality of blocks.

17. The computer readable medium of claim 16, wherein the root block is resilvered prior to resilvering any of the third plurality of blocks and the fourth plurality of blocks.

18. The computer readable medium of claim 17, wherein all of the third plurality of blocks that require resilvering are resilvered prior to resilvering any of the fourth plurality of blocks.

19. The computer readable medium of claim 15, wherein resilvering all of the first plurality of blocks that require resilvering comprises using a dirty time log (DTL).

20. The computer readable medium of claim 19, wherein the DTL comprises a birth time corresponding to a transaction group associated with an input/output (I/O) request to store a block in the first plurality of blocks.

21. The computer readable medium of claim 19, wherein the DTL is associated with a first disk in the storage pool, and wherein resilvering a block in the first plurality of blocks comprises updating the block using data from a second disk in the storage pool.