[CentOS] debugging RAM issues
John R Pierce
pierce at hogranch.com
Wed Mar 14 15:35:40 EDT 2012
On 03/14/12 12:16 PM, Les Mikesell wrote:
> If you were running software RAID1 on that box, don't trust anything
> on the drives now. Maybe even if you weren't, but it is especially
> weird when alternate reads randomly revive bad data that you thought
> had been fixed already.
and the worst part is, even if you found mismatching blocks on the
mirrors, there's no way to know which one is the 'good' one, as there's
no block checksumming or anything like that with conventional RAID.
this is a major reason I *insist* on ECC for any sort of server other
than a lightweight home system. ECC memory will detect bit failures so
you KNOW something is funky.
this is also a major reason why RAID is *not* a substitute for backup,
its ONLY about availability.
john r pierce N 37, W 122
santa cruz ca mid-left coast
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