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[Tomoki Sekiyama <tomoki.sekiyama@xxxxxxx>]

Public bug reported:

If iscsi_use_multipath=True is specified in nova.conf, a volume is
attached to instances using "multipath -l" or "multipath -ll" command in
order to find the multipath device. However, in some configuration,
"multipath -l" command may report an error like below:

 # multipath -l
 Mar 17 12:31:18 | sda: No fc_host device for 'host-1'
 mpathb (360000000000000000e00000000010001) dm-4 IET ,VIRTUAL-DISK
 size=1.0G features='0' hwhandler='0' wp=rw
 |-+- policy='service-time 0' prio=0 status=active
 | `- 2:0:0:1 sda 8:0 active undef running
 `-+- policy='service-time 0' prio=0 status=enabled
   `- 3:0:0:1 sdb 8:16 active undef running

Current multipath parser implementation in Nova cannot recognize this
warning message and regards "Mar" a valid multipath device name. As a
result, the volume cannot be attached to instances correctly.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1433204

Title:
  Cannot recognize warning message from "multipath -l" command

Status in OpenStack Compute (Nova):
  New

Bug description:
  If iscsi_use_multipath=True is specified in nova.conf, a volume is
  attached to instances using "multipath -l" or "multipath -ll" command
  in order to find the multipath device. However, in some configuration,
  "multipath -l" command may report an error like below:

   # multipath -l
   Mar 17 12:31:18 | sda: No fc_host device for 'host-1'
   mpathb (360000000000000000e00000000010001) dm-4 IET ,VIRTUAL-DISK
   size=1.0G features='0' hwhandler='0' wp=rw
   |-+- policy='service-time 0' prio=0 status=active
   | `- 2:0:0:1 sda 8:0 active undef running
   `-+- policy='service-time 0' prio=0 status=enabled
     `- 3:0:0:1 sdb 8:16 active undef running

  Current multipath parser implementation in Nova cannot recognize this
  warning message and regards "Mar" a valid multipath device name. As a
  result, the volume cannot be attached to instances correctly.

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