Re: what does md do if it finds an inconsistency?

["martin f krafft" <madduck@madduck.net>]

> The first time it reports that it found (and repaired) 128 items.
> It does not mean that you now *have* 128 mismatches.
>
> The next run ('repair' or 'check') will find none (hopefully...)
> and report zero.

Oh, this makes perfect sense, thanks for the explanation.

As the mdadm maintainer for Debian, I would like to come up with a way to
handle mismatches somewhat intelligently. I already have the check
sync_action run once a month on all machines by default (can be turned
on/off via debconf), and now I would like to find a good way to react when
mismatch_count is non-zero. I don't want to write to the components
without the admin's consent though.

Maybe the ideal way would be to have mdadm --monitor send an email on
mismatch_count>0 or a cronjob that regularly sends reminders, until the
admin logs in and runs e.g. /usr/share/mdadm/repairarray.

Thoughts?

Also, if a mismatch is found on a RAID1, how does md decide which copy is
mismatched and which is correct? What about RAID 5/6/10?

Thanks for your time!
-martin

>
> --
> Eyal Lebedinsky (eyal@eyal.emu.id.au) <http://samba.org/eyal/>
> 	attach .zip as .dat
>
>