On Fri, May 28, 2010 at 2:49 AM, Rainer Fuegenstein
<rfu@kaneda.iguw.tuwien.ac.at> wrote:
quoted text
>
>> I have this service running
>> /etc/init.d/mdmonitor
>> with this command
>> mdadm --monitor --scan -f --pid-file=/var/run/mdadm/mdadm.pid
>>
>> that should be the one, right?
>
> check also /etc/cron.weekly, at least in centos there's a 99-raid-check
> script.
>
> what does it mean when this script is running weekly for years at around
> 04:00 without an noticable activity in the morning, but suddenly it syncs
> for about 12hours every week? that something is wrong with the disks?
>
>
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Very likely yes.  Check your dmesg / system message log file.

You should also have some way of running SMART tests on the drives on
a regular basis.  I do recall that there was some issue with certain
raid controller chipsets and how they interacted with those commands
in a negative way...
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