[Bug 1496210] Re: multipath-tools lacks the default settings for IBM 2810XIV storage system

[Brian Murray]

Hello bugproxy, or anyone else affected,

Accepted multipath-tools into trusty-proposed. The package will build
now and be available at https://launchpad.net/ubuntu/+source/multipath-
tools/0.4.9-3ubuntu7.8 in a few hours, and then in the -proposed
repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: multipath-tools (Ubuntu Trusty)
       Status: In Progress => Fix Committed

** Tags added: verification-needed

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https://bugs.launchpad.net/bugs/1496210

Title:
  multipath-tools lacks the default settings for IBM 2810XIV storage
  system

Status in multipath-tools package in Ubuntu:
  Fix Released
Status in multipath-tools source package in Trusty:
  Fix Committed
Status in multipath-tools source package in Vivid:
  New
Status in multipath-tools source package in Wily:
  Fix Released

Bug description:
  [Impact]
  This impacts users of the IBM XIV storage system, which will not function properly with multipath in some circumstances given the missing default settings.

  
  [Test case]
  1) Run 'multipath -l';
  2) Observe the line immediately below the device header; it should read similar to this:
  size=32G features='1 queue_if_no_path' hwhandler='0' wp=rw

  As opposed to without the patch:
  size=32G features='0' hwhandler='0' wp=rw

  
  Alternatively:
  "If a multipath device is configured with features "1 queue_if_no_path", then any process that issues I/O will hang until one or more paths are restored."
  1) Remove all paths for a disk drive.
  2) Try to list files on the device.

  
  [Regression Potential]
  Given that this changes the default settings for the IBM 2810XIV storage systems, if some users of this hardware have come to rely on the incorrect settings provided, the behavior will change.

  
  ---Problem Description---
  multipath-tools is lacking the settings for IBM 2810XIV storage system

  Specially, the lack of queue_if_no_path is problematic on PowerVM LPM (live partition migration) operations,
  because I/O errors will trigger filesystem errors, which on ext4 remount the fs in read-only mode, by default.

  Please incorporate this upstream commit in 15.10, 15.04 and 14.04:
      864162b08067d3e55d52996846d10a046956c6d6 Add default values for IBM XIV Storage System.

  ---uname output---
  Ubuntu 15.10, 15.04, and 14.04

  ---Additional Hardware Info---
  IBM 2810XIV Storage

  The upstream commit applies cleanly on 15.10 (0.5.0-based) and 15.04,
  14.04 (0.4.9-based).

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