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According to adaptec support site, data on a disk got corrupted. The disk is physically fine and thats why it shows up as optimal. The solution is to reinitialize the disk. The only problem is I can't figure out which disk has the problem. Adaptec Storage Manager just says raid is degraded and all disks are optimal with no more information. Any ideas?

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up vote 1 down vote accepted

The disk that caused this should no longer be part of the active array. Maybe it was re-assigned as the hotspare or you need to scan for un-assigned hard disks?

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Looks like the drive was simply removed from the list instead of being marked as bad. Your comment helped narrow that down for me. Thanks! – Jason Jan 6 '11 at 20:30
You're welcome :-) Thanks for reporting back and letting me know my bitter and hard-earned experience is useful. – DutchUncle Jan 6 '11 at 21:11

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