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== Comment: #0 - Mauricio Faria De Oliveira - 2016-03-23 10:40:56 ==
---Problem Description---
Multipath assigned user_friendly_names during initramfs
In the initramfs, there's one call to multipath which has no -B argument
(local-premount).
It assigns new/different user_friendly_names to devices which might differ from
that in the rootfs.
The names should not be assigned during initramfs time, and dealt w/ during
rootfs time, then updated to initramfs accordingly.
--- Steps to Reproduce ---
Boot with break=pre-multipath,post-multipath:
Skip the 2 breakpoints in scripts/init-top/multipath.
...
(initramfs) exit
...
(initramfs) exit
starting version 229
...
Skip the 1st breakpoint in scripts/local-top/multipath.
(initramfs) exit
Begin: Loading multipath modules ... Success: loaded module dm-multipath.
Failure: failed to load module dm-emc.
done.
Begin: Starting multipathd ... Spawning shell within the initramfs
...
The multipath device names are not-user_friendly_names.
That is enabled, but there are no names defined in /etc/multipath/bindings,
so 'multipath -B' will not use user_friendly_names.
(initramfs) multipath -l -v1
36005076303ffd2a40000000000000349
36005076303ffd2a40000000000000348
36005076303ffd2a40000000000000347
36005076303ffd2a40000000000000346
(initramfs) grep user_friendly_names /etc/multipath.conf
user_friendly_names yes
(initramfs) cat /etc/multipath/bindings
# Multipath bindings, Version : 1.0
# NOTE: this file is automatically maintained by the multipath program.
# You should not need to edit this file in normal circumstances.
#
# Format:
# alias wwid
#
(initramfs)
Skip until the 1st breakpoint in /scripts/local-bottom/multipath:
(initramfs) exit
done.
Begin: Running /scripts/local-premount ... Begin: Waiting for udev to
settle (multipath) ... done.
done.
...
Begin: Running /scripts/local-bottom ... Spawning shell within the initramfs
...
And now we've got user_friendly_names:
(initramfs) multipath -l -v1
mpathd
mpathc
mpathb
mpatha
That's because the multipath call in /scripts/local-premount/multipath
has no -B option.
(initramfs) grep multipath /scripts/local-premount/multipath
if [ -x /sbin/multipath ]
[ "$quiet" != "y" ] && log_begin_msg "Waiting for udev to settle
(multipath)"
multipath -r -v0
And it changed the contents of /etc/multipath/bindings,
which is not desired for the initramfs (may conflict w/ the rootfs's file).
(initramfs) cat /etc/multipath/bindings
# Multipath bindings, Version : 1.0
# NOTE: this file is automatically maintained by the multipath program.
# You should not need to edit this file in normal circumstances.
#
# Format:
# alias wwid
#
mpatha 36005076303ffd2a40000000000000346
mpathb 36005076303ffd2a40000000000000347
mpathc 36005076303ffd2a40000000000000348
mpathd 36005076303ffd2a40000000000000349
(initramfs)
--- Solution verification ---
On another boot, appending -B on that multipath command, things work
fine:
(initramfs) sed -i '/multipath -r/ s/$/ -B/' /scripts/local-
premount/multipath
(initramfs) grep multipath /scripts/local-premount/multipath
if [ -x /sbin/multipath ]
[ "$quiet" != "y" ] && log_begin_msg "Waiting for udev to settle
(multipath)"
multipath -r -v0 -B
(initramfs) exit # a few times until
...
Begin: Running /scripts/local-bottom ... Spawning shell within the initramfs
...
(initramfs) multipath -l -v1
36005076303ffd2a40000000000000349
36005076303ffd2a40000000000000348
36005076303ffd2a40000000000000347
36005076303ffd2a40000000000000346
(initramfs) cat /etc/multipath/bindings
# Multipath bindings, Version : 1.0
# NOTE: this file is automatically maintained by the multipath program.
# You should not need to edit this file in normal circumstances.
#
# Format:
# alias wwid
#
(initramfs)
== Comment: #3 - Mauricio Faria De Oliveira - 2016-03-23 10:43:24 ==
Hi @taco-screen-team,
@mathieu-tl is the suggested contact for this bug (multipath bugs et
al.)
Thanks
** Affects: multipath-tools (Ubuntu)
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Tags: architecture-ppc64le bugnameltc-139569 severity-critical
targetmilestone-inin1604
--
Multipath assigned user_friendly_names during initramfs
https://bugs.launchpad.net/bugs/1561103
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