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CheckDB errors after upgrade from 2k8 sp3 to 2012


CheckDB errors after upgrade from 2k8 sp3 to 2012

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Perry Whittle
Perry Whittle
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What disk type are you using, what does Windows think the type is?

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"Ya can't make an omelette without breaking just a few eggs" ;-)
SpringTownDBA
SpringTownDBA
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Gpt partitioned lun on ibm ds4200 san. Windows sees it as such. the vol was created on a win 2k3 clus, detached, moved, re-attached on w2k8 then again on w2k8r2. a couple months ago the lun was extended from 2t to 3.4 tb. It does seem that the most recent attachment caused the corruption.
SpringTownDBA
SpringTownDBA
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status update: worked through ms support, verified that win wouldn't have caused this corruption as the detach/attach of the lun wouldn't have caused the partition data to be touched at all.

also found a known bios bug that affected these machines and would cause this corruption. we had already patched our bios to a version that included the fix, so it seems there was a regression. still working with hw vendor...

I fixed the corruption by cheating. I used a hex editor to overwrite the corrupt 20k from a staging copy of the db. The affected pages hadn't changed, and a checkdb afterwards came up clear, so I feel pretty good about the fix. it it hadn't worked, restoring full plus diff would have been the next step. Not the recommend approach, but effective.
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