Dan, Dave:

After sending all the system logs from raid-msr-e18-0-0 to Nexsan, Dan managed to clear the fault by performing a reset of controller-0. The system correctly failed over to the backup controller-1 and sent emails to sysadmin.

The vague controller-0 hardware fault occurred sometime on Saturday (12/16) and was reported in the daily status emails, but was not emailed at the time of the failure. This is a bug in the system since we have subscribed to all alerts.