Public bug reported:
== Comment: #0 - Mauricio Faria De Oliveira <mauri...@br.ibm.com> - 2016-03-14
09:39:20 ==
Support 'multipath -a' to facilitate post-install migration to multipath
environment.
The attached patch adds 2 upstream commits to support 'multipath -a'.
Verification:
--------------
The new '-a' option:
# multipath -h 2>&1 | grep -- -a
multipath [-a|-c|-w|-W] [-d] [-r] [-v lvl] [-p pol] [-b fil] [-q] [dev]
-a add a device wwid to the wwids file
If the device's wwid is not on the wwids file, it's not multipathed:
# grep -v '^#' /etc/multipath/wwids
/0QEMU_QEMU_HARDDISK_xenialroot/
# multipath -v3 | grep wwid
Mar 14 10:23:10 | wwid 0QEMU_QEMU_HARDDISK_xenialother not in wwids file,
skipping sdc
Now, 'multipath -a' adds it to the wwids file:
# multipath -a /dev/sdc
wwid '0QEMU_QEMU_HARDDISK_xenialother' added
# grep -v '^#' /etc/multipath/wwids
/0QEMU_QEMU_HARDDISK_xenialroot/
/0QEMU_QEMU_HARDDISK_xenialother/
And it is successfully multipathed:
# multipath -v3 | grep wwid
Mar 14 10:24:14 | found wwid 0QEMU_QEMU_HARDDISK_xenialother in wwids file,
multipathing sdc
Mar 14 10:24:14 | Found matching wwid [0QEMU_QEMU_HARDDISK_xenialother] in
bindings file. Setting alias to mpathb
By the way, it works even if the device is locked by a LVM member
(which doesn't if you try just 'multipath <device>').
This helps a lot on LVM/multipath scenarios, which had boot issues:
# dmsetup table | grep VG
VGsdc-LVsdc: 0 8388608 linear 8:32 2048
# ls -l /dev/sdc
brw-rw---- 1 root disk 8, 32 Mar 14 10:28 /dev/sdc
** Affects: ubuntu
Importance: Undecided
Assignee: Taco Screen team (taco-screen-team)
Status: New
** Tags: architecture-ppc64le bugnameltc-138917 severity-high
targetmilestone-inin1604
** Tags added: architecture-ppc64le bugnameltc-138917 severity-high
targetmilestone-inin1604
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https://bugs.launchpad.net/bugs/1556967
Title:
Support 'multipath -a'
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