Data Loss Possible When Using FastBack Server Deduplicated Repository

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Abstract

An IBM Tivoli Storage Manager (TSM) FastBack deduplicated repository can become corrupted when a memory allocation error occurs.

Content

The TSM FastBack deduplication service process attempts to obtain the contiguous memory it needs via a memory allocation command. If that memory allocation command fails, FastBack still continues with its processing, causing the FastBack deduplicated repository to become corrupted. Once a local FastBack deduplicated repository has been corrupted, the repository must be rebuilt. APAR IC89143 was opened for this issue.

Releases affected:

  • FastBack 6.1.0.0 through 6.1.7.0

Conditions for the problem to occur:
Both of the following conditions must occur:
  • An affected FastBack release is used with a FastBack server deduplicated repository
  • The FastBack deduplication service does not have enough contiguous memory available

How can you tell if you are affected?
Any customer using a FastBack server deduplicated repository with an affected release could potentially be affected.
There is not a consistent set of error messages after the repository has been corrupted.

Workaround:
Use the local FastBack repository in standard mode (NTFS repository) and not as a deduplicated repository.

Recommended alternatives to deduplicated repositories:
  • Use NTFS compression to reduce the repository usage of the FastBack server. When Disaster Recovery (DR) is not required, additional data reduction is achieved by setting the Cleanup level to “High”.
  • Use other data reduction technologies such as hardware storage deduplication.

Fix:
Beginning with the FastBack 6.1.7.1 interim fix, processing will stop immediately when memory cannot be obtained, preventing corruption of the deduplicated repository.

FastBack release levels affected First level with fix
6.1.0.0 through 6.1.7.0 6.1.7.1

available in Fix Central


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Document information


More support for:

Tivoli Storage Manager FastBack

Software version:

6.1

Operating system(s):

Platform Independent

Reference #:

1628279

Modified date:

2013-03-13

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