On 1 October 2013 21:42, Mark Keisler [off-list ref] wrote:

Is scrub (sync) needed on RAID10?  I've noticed in mdadm monitor logs that
it seems to re-allocate data destined for bad blocks on the fly anyway.
 Maybe I don't quite understand what the scrub does, though :)
I ran it for the first time on my RAID last night anyway to make sure all
way well since I am failing out a dying disk for replacement today.
--
Mark Keisler
"I have been here. Now I am going there. Where? ... No, I won't have it!"
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"Scrubbing" (or verifying the array consistency) is not /required/ on
any array, but it's recommended, if you care about your data. So yeah,
why not? For a RAID10 I suppose it just checks that the copies in the
2 sub arrays are identical.
Another thing to do in addition to scrubbing would be extended SMART
self-tests (smartctl -t long).

Mathias