Re: mismatch_cnt again

Piergiorgio Sartor
2009-11-07T16:23:53Z

On 11/07/2009 03:58 PM, Doug Ledford wrote:
[...]
> I'm very quickly starting to become dubious of the current mismatch_cnt
> implementation. I think a kernel patch is in order and I may just work
> on that today. Here's the deal: a non-0 mismatch count is worthless if
> you don't also tell people *where* the mismatch is so they can
> investigate it and correct it.

You're perfectly right.

And this, again, fits in the discussion of RAID-6 error
check and, potentially, repair.

Ideally the log should tell which (RAID) address has a
mismatch and, in case of RAID-6, if a specific device
could be faulty at that position.

This would be already quite a huge step forward in improving
the overall reliability of the RAID sub-system.

Side note: in F11 there is this cron.weekly raid-check, but
nothing is reported (per email to root) in case of mismatch.
Is there any plan to add a such a facility?

Thanks.

bye,

--

piergiorgio