I received this error: This is an automatically generated mail message from mdadm running on host.xx.xx A Fail event had been detected on md device /dev/md2. It could be related to component device /dev/sda2. Faithfully yours, etc. P.S. The /proc/mdstat file currently contains the following: unused devices: Then I received this other email: Subject: FailedOpenDevice Device: /dev/sda [SAT], unable to