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[John Griffith <1639350@xxxxxxxxxxxxxxxxxx>]

My bad on this; the actual problem is an unhandled failure/crash if
multipath-d isn't installed/running.

** Changed in: os-brick
       Status: New => Opinion

** Changed in: os-brick
   Importance: Undecided => Wishlist

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https://bugs.launchpad.net/bugs/1639350

Title:
  Use of CONF.libvirt.volume_use_multipath should not be mandatory

Status in OpenStack Compute (nova):
  Opinion
Status in os-brick:
  Opinion

Bug description:
  Currently if iscsi_multipath is set in nova.conf we require ALL
  attachments to use multipath.  The problem with this is that it's not
  uncommon to have a mix of Cinder backends; one that supports multipath
  and one that doesn't.  The result with how we do this now is that you
  can have only one or the other but not both.

  We should be able to revert to single-path when multipath doesn't work
  for the volume; also might be worth considering if the multipath
  support should just be embedded as part of the volume object and skip
  the need to configure it in Nova at all.

  To reproduce, set up a default devstack with LIO and LVM; set
  nova.conf iscsi_multipath=True, restart nova.

  Create a volume, create an instance, try and attach the volume to the
  instance.

  Example stack trace here:
  http://paste.openstack.org/show/587939/

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