Hello, I have the same problem.
Setting udev in debug mode (/etc/udev/udev.conf) you'll notice any problem.
At the first I discovered that I missed install dmsetup. But later I saw that
kpartx said that the multipath device was not there.
I think that the problem is that multipath is too slow creating the devices and
udev is too fast launching kpartx.
Probably there's a way to say udev to wait until the device is created, but I'm
not a udev guru and actually I don't care, so I solved it with this hack: an
small script called /sbin/my-kpartx:
---- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
#!/bin/sh
wait_devices() {
while [ $# -gt 0 ]; do
if ! expr $1 : "-[a-z]" > /dev/null; then
COUNT=0
while [ $COUNT -lt 10 ] && [ ! -b $1 ]; do
echo "Waiting for $1."
sleep 1
COUNT=$(($COUNT+1))
done
return
fi
shift
done
}
wait_devices $@
/sbin/kpartx $@
---- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
And I modified the multipath-tools udev rules
(/etc/udev/rules.d/multipath.rules). You have to restart udev:
---- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
# take care of devmap partitioning
ACTION=="add", SUBSYSTEM=="block", KERNEL=="dm-*", \
PROGRAM="/sbin/dmsetup -j %M -m %m --noopencount --noheadings -c -o name
info", \
RUN+="/sbin/my-kpartx -a /dev/mapper/%c"
---- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
That works :)
Note: I backported multipath-tools to sarge. There dmsetup doesn't allow the -o
option, so I have to write this script /sbin/get_multipath_name:
---- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
#!/bin/sh
/sbin/dmsetup -j $1 -m $2 --noopencount --noheadings -c info | cut -f 1 -d :
---- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
and use this rules:
---- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
ACTION=="add", SUBSYSTEM=="block", KERNEL=="dm-*", \
PROGRAM="/sbin/get_multipath_name %M %m", \
RUN+="/sbin/my-kpartx -a /dev/mapper/%c"
---- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
I think that the solution is tune the udev rules file, or extend kpartx to wait
for the device or to use the major:minor number directly.
--
Atentamente,
Héctor Rivas
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