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Failed logical drive on Adaptec 2120

Posted on 2011-05-12
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Have an old server (Win3003), a HP E800 box with an Adaptec 2020S controller and 4 SCSI drives in a raid 5 configuration. Today the alarm went on on the controller. Opening Adaptec Storage Manager showed a failed drive (drive 0). Did a controller rescan, and the drive changed status to "Optimal" - as the others. The logical drive, however, still shows as "Degraded". This seems to give me no options to repair any of the physical drives. Server still works, but it would be good to get the array back to a healthy state. Any recommendations?
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Question by:Olaf Berli
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by:David
ID: 35747311
You can't repair the degraded LUN w/o yanking the bad drive and putting in a replacement in slot 0.  
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by:Olaf Berli
ID: 35747349
Strange thing is that Adaptec SM shows all physical drives as good.....
I've seen options to fail a drive and then rebuild it (if it actually is ok), but can't find this option.
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by:David
ID: 35747451
The drive is only "good" because you effectively reset it.  This does not change the fact that the RAID array kicked the disk offline (presumably because it was throwing errors).

Trust that the RAID controller knows the disk is unreliable.
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David earned 2000 total points
ID: 35747489
If you try to force the disk back in, AND you have an error anywhere else during the rebuild, then you could very well end up with 100% data loss.  This is not exactly a premium controller with the intelligence to handle multiple failure scenarios.  Put a replacement drive in ASAP, and make sure you have a full backup.   Even a single unrecoverable read error means partial data loss at this point. You have no time to waste.
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Author Comment

by:Olaf Berli
ID: 35747815
Understand. Making disk images of the partitions on the logical drive now. Will hopefully find a replacement drive (18GB) around. Alternative - a new server...  

Any idea what (if anything) the repeating beeps from the controller means. It goes something like "do-do-do-do-di-da"?  - and if it is possible to turn it off (the initial alarm is turned off already).

Thanks for you help!
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by:David
ID: 35748380
Sorry, I don't have a programming manual for the 2120, so can't tell you what it means.  

For what it is worth, this is a GREAT opportunity to virtualize the system.  Let's face it, with that old controller, and those 18GB drives, then you'd probably get just as good write performance on a quality USB flash drive ;)
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Author Closing Comment

by:Olaf Berli
ID: 35764258
Turned out to be a controller (Adaptec 2120S error). It failed with a kernel error. Upgraded the controller firmware. After reboot, it rebuilt the drive and ran ok for a day. Then another drive failed..... New server ordered...
Thanks
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