server 2003 hardware raid 5/disk issue

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I have a problem.

Ater a power outage I have been having problems with a volume/disks within that volume.

Basic setup win2003 server, raid card, 2 arrays, 1st 2 disks as a mirror containing os has been working fine. The second, 4 disks in a raid 5 array have been either one , two or all 4 having red lights come up with error. Usually a reboot the drives are accessable again for some time. Note, it is not the same drives that fail.

Is it the raid cointroller failing or the drives?

 

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Would sound like the controller to me tbh, even though there was a power outage i wouldn't imagine it'd render all 4 drives useless, unless you've been very very unlucky