I also experienced the same problem with a IMSM RAID 1. I believe that
the problem is essentially identical to the gentoo problem which was
noted earlier. I put in the following workaround which seems to work
(on a clean install of Ubuntu 14.04.1 with mdadm version 3.2.5). At
least, I have not seen a resync on boot since putting this in this fix.
1. Edit /etc/init.d/sendsigs (to prevent mdmon from being killed on shutdown):
OMITPIDS=`pidof mdmon | sed -e 's/ /,/g' -e 's/./-o \0'`
2. Edit /etc/init.d/umountroot (to force the system to wait for the
RAID to be clean before shutdown):
##########################
#FIRST: Add the following function:
check_raid() {
log_action_begin_msg “Checking RAIDs ”
if mdadm --wait-clean --scan ; then
log_action_end_msg 0
else
log_action_end_msg 1
fi
}
#SECOND: change the call to do_stop:
#stop)
# do_stop
# ;;
stop)
check_raid
do_stop
check_raid
;;
##########################
It isn't clear that check_raid has to be called both before and after
do_stop (probably after will work fine, but I didn't test it).
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https://bugs.launchpad.net/bugs/1320402
Title:
mdadm resyncs imsm raid in "Normal" state
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