yahoo-eng-team team mailing list archive

[John Griffith <1639350@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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/

** Affects: nova
     Importance: Undecided
         Status: New

** Affects: os-brick
     Importance: Undecided
         Status: New

** Also affects: os-brick
   Importance: Undecided
       Status: New

-- 
You received this bug notification because you are a member of Yahoo!
Engineering Team, which is subscribed to OpenStack Compute (nova).
https://bugs.launchpad.net/bugs/1639350

Title:
  Use of iscsi_multipath should not be mandatory

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

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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