December 20, 2011: This document was updated with a fix announcement. See Solution below.
When performing block-level incremental backups (BLIBs) for VMware backups, incremental images are tied to "Copy 1" of a full backup and expire when that copy expires. This means that there is a potential for still valid incremental images to be expired after Copy 1 of their associated full backup is duplicated and then expired, but before the duplicated full backup(s) ("Copy 2" and above) have expired.
When attempting to restore from a block level incremental backup, it is discovered that the image no longer exists, even though duplicate full backups exist which have not reached their respective retention levels. This may lead to results where the only available means for restoration of a VMware backup are at an earlier point in time than expected because the restoration must be taken from a previous full backup.
The formal resolution to this issue (Etrack 2245805) is included in the following release:
- NetBackup for VMware 7.1 Release Update 3 (188.8.131.52)
More information on the NetBackup 184.108.40.206 release is available in the Related Article below.
Reconfigure affected policies to either not perform block level incremental backups, or not perform duplication of the full backups.
If this workaround is unfeasible, please contact Symantec technical support, referencing this document ID and Etrack 2245805 to determine if an Emergency Engineering Binary (EEB) replacement for bpdbm may be available.
Symantec strongly recommends the following best practices:
1. Always perform a full DR backup prior to making any changes to your environment.
2. Always make sure that your environment is running the latest version and patch level.
3. Perform periodic "test" restores.
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What is Affected:
This issue affects all released versions of NetBackup for VMware through version 220.127.116.11 on all supported platforms.
How to Determine if Affected:
If Perform block level incremental backups is enabled on a VMware policy and duplications are being performed against images in that policy, this issue may be experienced.