Symm, thanks for the info. How do you find out what these error messages refer to?

I looked a little deeper and found that our RAID controller (3ware 9690SA) does a scheduled verify every night at 12:00 AM, and the event log in the RAID controller shows that the job kicks off at 12:03 - the same time as the error message timestamp above. It does this every night. Is it possible that the increased drive usage as it verifies the RAID5 parity information would cause the DSS error?