Exchange 2010 Differential backup runs very slow when GRT is enabled and Destination Folder is on Dedupe
We have been running through this very slow backup problem on Exchange Differential for 6 weeks already. We are using Symantec Backup Exec 2010 R3 SP2 and Hotfix 180429 & 176937 installed. Our first setup was Weekly Full (GRT enabled) + Daily Differential (GRT Disabled) and it was running smoothly, the job rate of differential backup runs at 1,500MB/min and it completes successfully at about 15 minutes only. On July 29, 2012, we decided to create new backup templates for Exchange inside a policy so that we could also enable GRT on Differential. After we have successfully enabled GRT on Differential, we ran the Differential backup on July 2, 2012 and we observed a tremendous effect in job rate, it went down from 1,500MB/min to 22MB/min. In addition to this slow job rate, we are also experiencing a failure on our Wednesday(3rd day) differential backup with the following error message:
Backup- \\DMCIMAIL.dmcinet.com\Microsoft Information Store\DATABASE01 V-79-57344-759 - Unable to complete the operation for the selected resource using the specified options. The following error was returned when opening the Exchange Database file: '-1014 The database is out of page buffers. '
Backup- \\DMCIMAIL.dmcinet.com\Microsoft Information Store\DATABASE02
V-79-57344-759 - Unable to complete the operation for the selected resource using the specified options for the following reason: VFF Open Failure. This can be caused by low memory or disk resources.
We have several discussions with Symantec engineers but we are still unable to fix this problem. If we look into the situation, we can easily solve the issue on job rate by just disabling the GRT feature but we would want to keep this as we are looking forward on using granular restore in the future.
We are stuck in this situation are any suggestions or recommendations that would solve the issue would be greatly appreciated. We hope to solve this very soon as we are already running through this problem for 6 weeks already.
Thanks in advance!