FC attach fails to find multipath devices

[Patrick Schaefer]

For FC attached volumes from IBM SVC or DS8000 subsystems the existing code to find the corresponding multipath devices fails with an error.
This is caused by a different output format of the multpath command which is not parsed correctly.

An example output of 'multipath -l' would be:

36005076da00638089c000000000004cf dm-2 IBM,2145
size=954M features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=-1 status=active
| |- 6:0:0:0 sdc 8:32 active undef running
| |- 6:0:4:0 sdg 8:96 active undef running
| |- 6:0:2:0 sde 8:64 active undef running
| `- 6:0:6:0 sdi 8:128 active undef running
`-+- policy='round-robin 0' prio=-1 status=enabled
  |- 6:0:1:0 sdd 8:48 active undef running
  |- 6:0:5:0 sdh 8:112 active undef running
  |- 6:0:3:0 sdf 8:80 active undef running
  `- 6:0:7:0 sdj 8:144 active undef running

This issue exists in the Grizzly release of Nova (2013.1)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/30754

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/30754
Committed: http://github.com/openstack/nova/commit/d93e466857f75073b243fea9901ea21b77753485
Submitter: Jenkins
Branch: master

commit d93e466857f75073b243fea9901ea21b77753485
Author: Patrick Schaefer <email address hidden>
Date: Tue May 28 17:44:15 2013 +0200

    Enhance multipath parsing

    The output of the multipath command is not always parseable from
    the current implementation. This causes attach to fail.

    Fixes Bug: #1184861

    Change-Id: I1afa96a695b1008672226e7e76eb8e0feca52578