Possible disk corruption - help and advice appreciated
tim at seoss.co.uk
Tue Sep 21 09:58:40 CDT 2010
On 21/09/10 15:19, Faris Raouf wrote:
> If no problem is found we'll then we'll move on to the disk pulling
> procedure :-) Shame the R200 doesn't have hot swap drives!
I've seen random data corruption on SATA drives attached to SAS5, and
SAS6 controllers in R300, and PE860 boxes - we spotted it because we
prefer to use software RAID on top of the SAS5/6s, rather than use their
own RAID functionality. The R200s we run use the onboard Intel SATA
controller and have no problems. We're trying to phase out SAS5/SAS6 as
a result of this corruption (that and the ATA passthrough bug which LSI
still haven't fixed).
I believe that recent mdadm will understand the metadata format that
SAS5/SAS6 controllers use, and you should be able to then use the linux
software RAID to get a count of inconsistencies between the two halves
of the mirror.
If mdadm doesn't grok the metadata, then dmraid definitely does (but I
don't know if/how device mapper's RAID code does consistency checks -
haven't used it)....
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