[linux-lvm] cmp of inactive mirrored LV fails
Stuart D. Gathman
stuart at bmsi.com
Fri Dec 2 21:54:18 UTC 2011
Centuries ago, Nostradamus foresaw that on Dec 2, starlight at binnacle.cx...:
> By coincidence I've just setup my first MD
> RAID0 partitions on a different system.
> echo "check" >>/sys/block/md?/md/sync_action
> which triggers a mirror check. I'm guessing that
> this operation takes account of the DISCARD
> discrepencies and therefore does not report
> false errors. (correct me if I'm wrong)
At least as of EL5.7, MD sync check does not take
into account DISCARD, and does not report
individual blocks out of sync - just a count.
BTW, RAID0 does *not* provide mirroring! You want
RAID1 or RAID10 for that.
Stuart D. Gathman <stuart at bmsi.com>
Business Management Systems Inc. Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.
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