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Archive for Wednesday 31 Oct 2007
Isn’t RAID fun?
Wednesday 31 Oct 2007 by Orphi the AweKid.
Well, what can I say? Last night was way more eventful than I wanted! 
The plan was simple. Wait until just before home time. Shut down the server. Move some connections. Start an online RAID rebuild. Go home. This bears little relation to what actually happened.
As required by our disaster recovery test plan, I had removed a disk from the RAID array and put in a new blank one to demonstrate that the array will rebuild itself. No problems there! But then I went to put the old disk back into the array… but for reasons beyond my comprehension, the RAID controller fails to detect that this isn’t the same drive, and attempts to try and use the thing. This results in general chaos all round, since obviously the data is similar yet wildly out of sync.
There appears to be no way of convincing the RAID controller to not use the out of date information on this drive. It’s really frustrating — putting in a completely blank drive works fine, but putting in a drive that’s been part of the array before causes the whole thing to horribly malfunction!
God damn it! Anybody know how to erase a SCSI harddrive? (Without connecting it to a SCSI controller, that is…)
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