Bug#599821: mdadm: mismatch_cnt is not well checked or reported

[NeilBrown]

On Tue, 6 Dec 2011 23:19:21 +0400 Sergey Kirpichev <skirpichev at gmail.com>
wrote:

> Hello,
> 
> As a variant to fix this issue, please consider using
> attached patch.  Hope, it's simple enough to be
> accepted upstream.

Upstream has just applied it.

http://neil.brown.name/git?p=mdadm;a=commitdiff;h=d97a5e60506343bd8cb2b75d5003b2a49cbc8566

Thanks,
NeilBrown

> 
> On nonzero mismatch_cnt it makes log entry like this:
> -->8---
> Dec  6 22:52:42 squeeze mdadm[2376]: RebuildFinished event detected on md device /dev/md0, component device  mismatches found: 128 (on raid level 1)
> ---->8--
> 
> Thus, you can filter this out in logcheck rules _only_ for raid1/raid10:
> ----->8----
> ^\w{3} [ :0-9]{11} [._[:alnum:]-]+ mdadm(\[[[:digit:]]+\])?: Rebuild((Start|Finish)ed|[[:digit:]]+) event detected on md device /dev/[-_./[:alnum:]]+, component device  mismatches found: [0-9]+ \(on raid level (1|10)\)$
> ---->8---
> 
> This patch also can be useful for #588516.

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