Exchange 2003, 2007 or 2010 Incremental or Differential GRT backup to Deduplication Disk Storage may run slower than normal or cause intermittent failures.

Article:TECH186741

Created: 2012-04-18

Updated: 2012-09-17

Article URL http://www.symantec.com/docs/TECH186741

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Article Type
Technical Solution

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Problem

When targeting Deduplication Disk Storage for Exchange GRT incremental or differential backups, the job takes an unexpected amount of time. The job may also intermittently fail with a "VFF Open Failure" or "-1022 A Disk I/O error has occurred".

Error

Enable SGMon debugging to capture the error:

From HKLM\Software\Symantec\Backup Exec for Windows\Backup Exec\Engine\Exchange, create a new DWORD value - Debug Granular Restore.
Set DWORD Debug Granular Restore to 2.
Launch SGMon.exe from %Program Files%\Symantec\Backup Exec\ and check "Job Engine, RAWS and Agent Browser" and "Capture to File".

Re-run the backup job. The resulting SGMon log from the media server indicates the following error during the Exchange GRT process:

ERROR: roll forward not detected in the ancestor, switching to normal recovery

Environment

This can occur in Exchange 2003, 2007 or 2010 and Backup Exec 2010 R3 or Backup Exec 2012.

Cause

The combination of deduplication storage, GRT and Exchange Incremental or differential backups causes the behavior. The issue does not occur when backing up to disk storage.

Solution

WORKAROUND:
Backup to Backup to Disk Storage or disable GRT for the incremental backups. Alternatively, run full and incremental backups to disk, and perform a duplicate from disk to deduplication storage.

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Symantec Corporation has acknowledged that the above-mentioned issue is present in the current version(s) of the product(s) mentioned at the end of this article. Symantec Corporation is committed to product quality and satisfied customers.
This issue is currently under investigation by Symantec Corporation. Pending the outcome of the investigation, this issue may be resolved by way of a patch or hotfix in current or future revisions of the software. However, this particular issue is not currently scheduled for any release. If you feel this issue has a direct business impact for you and your continued use of the product, please contact your Symantec Sales representative or the Symantec Sales group to discuss these concerns. For information on how to contact Symantec Sales, please see http://www.symantec.com Please be sure to refer back to this document periodically as any changes to the status of the issue will be reflected here.

Supplemental Materials

Source	ETrack
Value	2753161
Description	PDDE: Exch: "ERROR: roll forward not detected in the ancestor, switching to normal recovery" received during Exchange 2010 Inc GRT backup to PDDE causing slow incremental backups to occur.

Source	ETrack
Value	2931084
Description	EXCH: GRT Differential and Incremental backups to PDDE run for an unexpected period of time or fail. Roll forward does not occur.