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

RedShift redshift at pandora.be
Tue Dec 1 10:06:30 UTC 2009


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.

> Has anybody make bugzilla this ?
> 
> 

I don't think so, this is a feature, not a bug... And as long as it's shipped with upstream it'll be shipped with CentOS.


Best regards,

Glenn


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