mdadm warning: superfluous parity checks ahead
- From: martin f krafft <madduck@xxxxxxxxxx>
- Date: Mon, 31 Jul 2006 15:09:07 +0100
Hi,
mdadm 2.5.2-7 recently hit testing. Among the new features is
checkarray, a script that checks the parity information of redundant
arrays (RAID 3,4,5,6).
I designed it to be run shortly after midnight on the first Sunday
of each month. Unfortunately, I misunderstood cron, and as a result,
the script will be run *every* Sunday, and also every single one of
the first seven days of each month. See #380425.
With 1 August 2006 coming up tomorrow, you may want to take
precautions: either upgrade to 2.5.2-8, which is currently in
unstable (and soon to be replaced by 2.5.2-9), or simply change the
file /etc/cron.d/mdadm with the attached patch:
# save attachment to /tmp/mdadm.cron.patch
patch /etc/cron.d/mdadm < /tmp/mdadm.cron.patch
I don't think it's really a problem if the parity check runs too
often, but it can cause performance problems, and it is extra strain
on your disks...
Sorry for the inconvenience.
--
Please do not send copies of list mail to me; I read the list!
.''`. martin f. krafft <madduck@xxxxxxxxxx>
: :' : proud Debian developer and author: http://debiansystem.info
`. `'`
`- Debian - when you have better things to do than fixing a system
"in the figure of the president, george w. bush, the incompetence,
stupidity, and sheer inhumanity that characterize so much of
america's money-mad corporate elite find their quintessentially
repulsive expression."
-- journalist, aftermath of katrina
Index: mdadm.cron.d
===================================================================
--- mdadm.cron.d (revision 4)
+++ mdadm.cron.d (revision 36)
@@ -5,5 +5,8 @@
# distributed under the terms of the Artistic Licence.
#
-# by default, run at 01:06 on the first Sunday of each month.
-6 1 1-7 * 7 root [ -x /usr/share/mdadm/checkarray ] && /usr/share/mdadm/checkarray --cron --all --quiet
+# By default, run at 01:06 on the every Sunday, but do nothing unless the day
+# of the month is less than or equal to 7. Thus, only run on the first Sunday
+# of each month. crontab(5) sucks, unfortunately, so therefore this hack
+# (see #380425).
+6 1 * * 0 root [ -x /usr/share/mdadm/checkarray ] && [ $(date +\%d) -le 7 ] && /usr/share/mdadm/checkarray --cron --all --quiet
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