[Bug 1547206] Re: Boot stalls on mountall "disk drive not ready" question in multipath-tools >= 0.4.9-3ubuntu7.5
Tore Anderson
tore at fud.no
Fri Feb 19 07:08:23 UTC 2016
After reviewing the changes between -3ubuntu7.4 and -3ubuntu7.5, I have
found that the problem is caused by the removal of the file
/lib/udev/rules.d/95-multipath.rules. In -3ubuntu7.4, it contained the
following:
#
# udev rules for multipathing.
# The persistent symlinks are created with the kpartx rules
#
# socket for uevents
RUN+="socket:/org/kernel/dm/multipath_event"
# Coalesce multipath devices before multipathd is running (initramfs, early
# boot)
ACTION=="add|change", SUBSYSTEM=="block", RUN+="/sbin/multipath -v0 /dev/$name"
If this file is manually reinstated (either to /lib/udev/rules.d or
/etc/udev/rules.d), boot is again successful (even with the latest
-3ubuntu7.9 multipath-tools package).
I see from the changelog that the removal was intentional:
* debian/rules: don't ship 95-multipath.rules udev rules anymore; they are
not necessary with multipath-tools listening for udev events directly.
* debian/multipath.udev: removed.
However, in order for this to actually work with multipath-backed "auto"
filesystems in /etc/fstab, it seems necessary to ensure that multipathd
is started before mountall runs. I am not entirely certain how to
accomplish this, though, as mountall is started from Upstart while
multipath-tools is stuck using a legacy SysV-init, and I do not know if
it is possible to enforce service ordering between the two init systems.
For what it's worth, renaming /etc/rcS.d/S21-multipath-tools-boot as
etc/rcS.d/S00-multipath-tools-boot does not work around the issue.
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https://bugs.launchpad.net/bugs/1547206
Title:
Boot stalls on mountall "disk drive not ready" question in multipath-
tools >= 0.4.9-3ubuntu7.5
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