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Message #11845
[Bug 1673350] Re: dm-queue-length module is not included in installer/initramfs
This bug was fixed in the package multipath-tools - 0.6.4-3ubuntu2
---------------
multipath-tools (0.6.4-3ubuntu2) zesty; urgency=medium
* debian/initramfs/hooks:
- Remove old dm-emc module; it hasn't been in kernel since 2.6.27.
- Add dm-queue-length: users may want to change from the default selector
and should be able to do so. (LP: #1673350)
* debian/patches/path_selector.patch, debian/patches/series: remove
path_selector.patch to get back to the "right" default selector of
service-time, which has been included in the kernel module packages for
a while now and has better throughput than round-robin. It's also the
default upstream. (LP: #1634161)
-- Mathieu Trudel-Lapierre <cyphermox@xxxxxxxxxx> Fri, 17 Mar 2017
09:37:36 -0400
** Changed in: multipath-tools (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1673350
Title:
dm-queue-length module is not included in installer/initramfs
Status in hw-detect package in Ubuntu:
Triaged
Status in initramfs-tools package in Ubuntu:
Triaged
Status in linux package in Ubuntu:
Fix Committed
Status in multipath-tools package in Ubuntu:
Fix Released
Status in hw-detect source package in Xenial:
New
Status in initramfs-tools source package in Xenial:
New
Status in linux source package in Xenial:
In Progress
Status in multipath-tools source package in Xenial:
New
Status in hw-detect source package in Yakkety:
New
Status in initramfs-tools source package in Yakkety:
New
Status in linux source package in Yakkety:
New
Status in multipath-tools source package in Yakkety:
New
Bug description:
[Impact]
Multipath users using EMC XtremIO storage as boot device or at install time may run into this issue. With the module unavailable the device is more often than not unavailable. Any users changing path selector to 'queue-length' with other storage devices may also be affected.
[Test case]
1) Install on multipath system using EMC XtremIO storage / OR:
a) Start d-i install on qemu with multipath enabled
b) exit to d-i menu
c) modify /etc/multipath.conf to define path selector as 'queue-length' for the local qemu device.
d) restart multipathd if necessary.
2) Try to complete the install, setting up storage as multipath and using the multipath device as boot disk.
3) Reboot to disk.
In a success case, the install should complete successfully without
requiring manual configuration from the user to support the multipath
storage past the normal detection of multipath and partitioning.
In a failure case, the install may not complete, or rebooting may fail
or lead to a system booted on a single path of the multipath device
(ie. / on /dev/sda2 rather than /dev/mpatha2).
[Regression Potential]
The inclusion of a new multipath path selector driver should not cause any regressions, but any failure to detect, configure or boot on multipath devices following this change on XtremIO hardware or otherwise would constitute a regression potentially caused by this change.
---
---Problem Description---
dm-queue-length module is not included in installer/initramfs
On Ubuntu, multipath devices using the 'queue-length' path selector
are non-functional on both the installer and initramfs environments;
because the 'dm-queue-length' kernel module is not included in them.
The multipath-modules.udeb (src:linux) does not include it in the installer,
nor multipath-tools-boot (src:multipath-tools) installs it in the initramfs.
One example is the EMC XtremIO storage, which has 'queue-length' defined as
its path selector in the default multipath configuration, at least on 16.04.
Other products may be affected if they are manually configured to use that
path selector (e.g., via /etc/multipath.conf), and the mere switch of that
might render the system _unbootable_ if booting from multipath, since the
initramfs is affected.
More recently this and another storage changed default path selectors out
of 'queue-length', however, it's virtually possible for any storage system
to be affected, with the described manual configuration change. So, this
change is also desired on for the next stable release, 17.04, and later.
Patches are provided for 16.04 and 17.04.
Error logs in LP comment #6.
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