VSS is being invoked to backup our SQL Server 2012 databases throughout the day. Occasionally, maybe once every few days, the application using the database hangs for a few minutes and coincidentally the sql server log shows that I/O was frozen for a few minutes (rather than less then a second for all other backups):
11/25/2014 09:11:50,spid87,Unknown,I/O was resumed on database ourdatabase. No user action is required.
11/25/2014 09:09:10,spid87,Unknown,I/O is frozen on database ourdatabase. No user action is required. However<c/> if I/O is not resumed promptly<c/> you could cancel the backup.
AppAssure (backup software) support said this may be an issue with VSS. What is the best way to go about troubleshooting this? I've read many posts with people having similar issues dating back to 2010 and haven't really come across any solutions. Should I simply open a case with MS support?
SQL Server 2012
Windows Server 2012 2 node cluster
Database file on Dell Equallogic iCSCI SAN
Dell AppAssure for Backups
Thanks,
-Bob