On Mon, 6 Nov 2006, dean gaudet wrote:

it should be only once a month... and it's just a "check" -- it reads
everything and corrects errors.

If you have a recent enough kernel, yes. I used 2.6.15 and it would 
actually rebuild, I think it was 2.6.16 that does correct "read and 
compare".

i think it's a great thing actually... way more useful than smart long
self-tests because md can reconstruct read errors immediately -- before
you lose redundancy in that stripe.

Quite, I highly recommend doing this on all RAID sets including hardware 
ones (3ware for instance) once a week.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se