Raid 1 Array Unexpected Rebuild

I have IBM System x 3400 Server running openSUSE 11.2 with two drives configured in RAID 1 array.
Twice now I have suffered unexpected rebuilds, the last one taking down my OS in the middle of a job.

If I can get the system up and running again, are there any diagnostic tools/logs in openSUSE that would help me find source of the problem, ie which drive or if it is the controller?

Regards,
Budgie2