On Mon, 15 Jan 2007, Robin Bowes wrote:

> I'm running RAID6 instead of RAID5+1 - I've had a couple of instances
> where a drive has failed in a RAID5+1 array and a second has failed
> during the rebuild after the hot-spare had kicked in.

if the failures were read errors without losing the entire disk (the 
typical case) then new kernels are much better -- on read error md will 
reconstruct the sectors from the other disks and attempt to write it back.

you can also run monthly "checks"...

echo check >/sys/block/mdX/md/sync_action

it'll read the entire array (parity included) and correct read errors as 
they're discovered.

-dean
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