This bug's gone pretty much unnoticed I guess, but I'm experiencing the
same issue. I'm scheduling downtime for next thursday (unfortunately
this is a production machine) to try out some different LVM
configurations, to make sure I can get it to reliably reboot with LVM
scanning the multipath nodes, instead of the raw (sd*) device nodes.
Here's the configuration I'm using and expecting to work:
lvm.conf:
devices {
dir="/dev"
scan="/dev"
filter=["a|/dev/mapper/mpath.*|", "r|.*|"]
cache="/etc/lvm/.cache"
write_cache_state=1
types=["device-mapper", 1]
sysfs_scan=1
md_component_detection=1
}
Note that "types=" contains device-mapper types. IIRC this is not by
default in Ubuntu, but is required for multipath support.
Also note that "filter=" is telling LVM to only scan for
/dev/mapper/mpath*. This will make sure that LVM is only scanning for
devices in /dev/mapper that begin with mpath. To get multipath to make
devices with this prefix, edit multipath.conf:
defaults {
...
user_friendly_names yes #names the devices mpath0 - mpath<n>
...
}
Or, optionally configure aliases for each multipath, and have them begin
with "mpath".
These changes *should* force LVM to only ever look at /dev/mapper, and
for multipath devices in particular, for PV's. If you use LVM for more
than just mpio, change the filter line in lvm.conf to something like:
filter=["a|/dev/mapper/mpath.*|", "a|^/dev/sda1$|", "a|^/dev/sdb1$|",
"r|.*|"]
This will add /dev/sda1 and /dev/sdb1 in addition to the mpio devices.
I'll update this bug next thursday to say whether it works or not after
a reboot.
** Changed in: multipath-tools (Ubuntu)
Status: New => Confirmed
--
udev breaks multipath after reboot when using LVM
https://bugs.launchpad.net/bugs/230006
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