[mythtv-users] Hard Drive reliability esp. RAID issues
ron at ronfrazier.net
Tue Mar 9 02:15:21 UTC 2010
> There are errors you don't see. Single-bit errors reading from the
> physical disk will generally be corrected (ECC) by the firmware on
> modern drives.
But see, that CAN'T be the type of error they are talking about,
because if the drive corrects it, then the RAID controller would never
even know about it and the rebuild would happen successfully.
> Then there are errors you do see. They make it through to the OS as
> either an I/O error or corrupted data. That often means that either the
> number of bad sectors is so high that the drive is out of spares or that
> some spot on the disk has started generating new errors quickly enough
> that the firmware didn't have a chance to remap it. However, it can also
> mean a bad cable or controller, or any number of other things.
Yeah, and that's a totally different failure mode than this 1 bit in 12TB thing.
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