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

[Eyal Lebedinsky <eyal@eyal.emu.id.au>]

martin f krafft wrote:
> also sprach martin f krafft <madduck@madduck.net> [2007.05.06.0245 +0200]:
> 
>>With the check feature of the recent md feature, the question popped
>>up what happens when an inconsistency is found. Does it fix it? If
>>so, which disk it assumes to be wrong if an inconsistency is found?
> 
> 
> What I meant was of course
> 
>   echo repair > sycn_action
> 
> I am unsure what happens:
> 
>   piper:/sys/block/md7/md# cat mismatch_cnt
>   128
>   piper:/sys/block/md7/md# echo repair > sync_action
>   piper:/sys/block/md7/md# cat sync_action
>   idle
>   piper:/sys/block/md7/md# cat mismatch_cnt
>   128 
> 
> If I do this again, then mismatch_cnt goes to 0. Not the first time.
> 
> md7 : active raid10 sda2[0] sdc2[2] sdb2[1]
>       1373376 blocks 64K chunks 2 near-copies [3/3] [UUU]

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.

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