[CentOS] Server offline :-( please help to repair software RAID

[Markus Falb]

On 1.5.2011 08:52, Alexander Farber wrote:
> Hello Mark and others,
> 
> On Thu, Apr 28, 2011 at 10:21 PM,  <m.roth-x6lchVBUigD1P9xLtpHBDw at public.gmane.org> wrote:
>> At this point, I'd run the long test on each drive, and (after coming back
>> an hour or two later, see the results.
> 
> I have that dreadly warning again -
> 
>         /etc/cron.weekly/99-raid-check:
>        WARNING: mismatch_cnt is not 0 on /dev/md0

This does not mean necessarily mean that something is wrong.
Writes are not occuring at exactly the same time, there is a short
timespan where data is written to disk A but not yet to disk B. So it is
possible that 2 mirrored blocks hold different data.

http://marc.info/?l=linux-raid&m=117555829807542&w=2
http://marc.info/?l=linux-raid&m=117304688617916&w=2
https://bugzilla.redhat.com/show_bug.cgi?id=566828

> By the "long tests" do you mean some Linux command
> I could run while booted in "rescue mode"?

$ smartctl -t long /dev/sdX

No need for rescue mode.

-- 
Kind Regards, Markus Falb

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