We're currently experiencing problems at boot and got aware of a
race-condition related to LVM over multipath.
We're on SuSE SLES9 SP3 x86_64, multipath-tools-0.4.5-0.11
The SuSE initscript contains 'sleep 1' after running /sbin/multipath in
/etc/init.d/boot.multipath. Our SAN is currently so slow that we had to
increase the sleep to 15 seconds to boot reliably. If the vgscan in
/etc/init.d/boot.lvm starts too quick it would not see the VGs on the
multipath devices.
Is there a way to wait until all multipath devices are up and ready?
The relevant part of SLES9 SP3 /etc/init.d/boot.multipath:
case "$1" in
start)
echo -n "Creating multipath targets"
# Check whether we should rescan for devices
if grep -q multipath /proc/cmdline && test -d
/sys/class/scsi_host; then
pushd /sys/class/scsi_host 2> /dev/null
for host in *; do
if [ -d $host ]; then
echo "- - -" > $host/scan
fi
done
fi
# Load prerequisite module
modprobe dm-multipath
# Clear /dev/disk/by-name/ prior to start-up; multipath will
# recreate them.
rm -f /dev/disk/by-name/* 2>&1 >/dev/null
# Start the program directly as checkproc doesn't work here
$PROGRAM -v 0
# Remember status and be verbose
rc_status -v
- sleep 1
+ sleep 15
;;
--
mike
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