On Fri, May 28, 2010 at 2:49 AM, Rainer Fuegenstein
[off-list ref] wrote:

quoted

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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