On Tue Mar 15, 2011 at 01:43:01PM +0000, Bas van Schaik wrote:
> My other question is still standing:
> > Furthermore, theoretically it should be possible to indicate which
> > device in the RAID-6 array contains the inconsistent data, or am I
> > mistaking? If so, that would certainly be a nice feature to see
> > implemented, as it would help diagnosing problems.
> Am I indeed correct in thinking this?
>
I'm not sure. If it's a single data block that's failed then you should
be able to, for each disk, re-generate the data using the other disks
and the P parity, then validate against the Q parity (if it matches then
that disk is the incorrect one). You should also be able to detect
errors in either the P or Q parity (if one is valid for the data and the
other isn't). If there's multiple disks which are incorrect then I
don't think there's any way you can tell which (or even avoid having one
of the correct disks flagged as incorrect).
Cheers,
Robin
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( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> |
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