[CentOS] /etc/cron.weekly/99-raid-check

Farkas Levente lfarkas at lfarkas.org
Tue Dec 1 12:51:32 UTC 2009

On Tue, Dec 1, 2009 at 11:06, RedShift <redshift at pandora.be> wrote:
> Jancio Wodnik wrote:
>> W dniu 30.11.2009 14:08, Farkas Levente pisze:
>>> hi,
>>> it's been a few weeks since rhel/centos 5.4 released and there were many
>>> discussion about this new "feature" the weekly raid partition check.
>>> we've got a lot's of server with raid1 system and i already try to
>>> configure them not to send these messages, but i'm not able ie. i
>>> already add to the SKIP_DEVS all of my swap partitions (since i read it
>>> on linux-kernel list that there can be mismatch_cnt even though i still
>>> not understand why?). but even the data partitions (ie. all of my
>>> servers all raid1 partitions) produce this error (ie. ther mismatch_cnt
>>> is never 0 at the weekend). and this cause all of my raid1 partitions
>>> are rebuild during the weekend. and i don't like it:-(
>>> so my questions:
>>> - is it a real bug in the raid1 system?
>>> - is it a real bug in my disk which runs raid (not really believe since
>>> it's dozens of servers)?
>>> - the /etc/cron.weekly/99-raid-check is wrong in rhel/centos-5.4?
>>> or what's the problem?
>>> can someone enlighten me?
>>> thanks in advance.
>>> regards.
>> Hi. I have this problem on my 2 servers (Both Centos 5.4) - every
>> weekend my raid1 set is rebuild, because
>> mismatch_cnt is never 0 at the weekend. What is really going on ? My 1TB disk whith raid1 are rebuild every weekend.
> They aren't being rebuilt, they are being checked if the data on the RAID disks are consistent. There are various reasons why mismatch_cnt can be higher than 0, for example aborted writes. Generally it's not really something to be worried about if you have for example a swap partition in your RAID array. If you do a repair and then a check the mismatch_cnt should reset to 0.

the mismatch_cnt is not 0 so then automatically checked and repaired
on all weekend. and this is not a swap partition as i wrote there are
the /srv partitions with only data.

  Levente                               "Si vis pacem para bellum!"

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