DPM 2010/2012 is quite resilient backup software. It tries failed backups after 1 hour again. But it does it only once. Sometimes I still have error messages like:
Failed to prepare a Cluster Shared Volume (CSV) for backup as another backup using the same CSV is in progress. (ID 32612 Details: Back up is in progress. Please wait for backup completion before trying this operation again (0x8007173D))
This happens on hyper-v clusters with shared storage. Of course you can run into other type of error messages. To increase the retry count change AutoRerunNumberOfAttempts registry key to a bigger value using following command:
reg add "HKLM\Software\Microsoft\Microsoft Data Protection Manager\Configuration" /v AutoRerunNumberOfAttempts /t REG_DWORD /d 2
The “/d 2” part specifies the rerun attempts count. I will try with 2 retries and see, whether it gives me less errors to fix on daytime.
To see other registry options see this URL http://blogs.technet.com/b/dpm/archive/2011/06/06/how-to-use-and-troubleshoot-the-auto-heal-features-in-dpm-2010.aspx
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