When there are greater than nine (9) paths with differing drive letters in the Backup Selections of a Windows policy where VSS (Volume Shadow Copy Service) is enabled, the potential exists under certain conditions for the tenth (10th) and later selections to be skipped. The backup will complete successfully with status code 0 reported in the Activity Monitor; however, files represented by the tenth and subsequent selection will not be available for restore.
What is Affected:
This issue affects all Windows clients on all NetBackup versions through 7.0.1 when VSS is enabled on policies containing more than nine paths of differing drive letters.
This issue is only seen during the first backup of a client after it has been rebooted. Subsequent backups will include all paths.
Suppose the Backup Selections for a particular Windows policy consisted of the following eleven (11) paths:
When affected by this issue, the M:\ and N:\ drives would not be backed up.
Suppose the Backup Selections for a particular Windows policy consisted of the following ten (10) paths:
When affected by this issue, D:\file_10 would not be backed up.
Note that in this list, each path has a different drive letter than in the one preceding it. Even though a total of only two drives are selected, configuring the Backup Selections in this alternating manner may reveal this issue.
How to Determine if Affected:
Examine Windows policies for Backup Selection lists containing more than nine paths.
The formal resolution to this issue (Etrack 2089113) was scheduled to be included in the following release:
- NetBackup 7.1, currently scheduled for release in the first quarter of 2011
At this time, there are no plans to address this issue in NetBackup 6.x. If upgrading to NetBackup 7.x is unfeasible at this time, please use the workaround described below.
Break up policies to contain nine or less Backup Selections.
If this workaround is unfeasible, please contact Symantec technical support, referencing this document ID and Etrack 2089113 to obtain an Emergency Engineering Binary (EEB) replacement library containing a fix for this issue.
Symantec strongly recommends the following best practices:
1. Always perform a full backup prior to and after 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.
4. Subscribe to technical articles.
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