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[Michael Still <mikal@xxxxxxxxxxx>]

** Also affects: openstack-manuals
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1222682

Title:
  Live Migration does not work unless cache=none

Status in OpenStack Compute (Nova):
  In Progress
Status in OpenStack Manuals:
  New

Bug description:
  If O_DIRECT is not supported, 'cache=none' is not set. Thus, Live
  Migration gives the following error:

  "Live Migration failure: Unsafe migration: Migration may lead to data
  corruption if disks use cache != none"

  However, it is ok to migrate if the storage is "coherent" across
  nodes. So Nova's live-migration should support the Libvirt's
  unsafe=True flag.

  Ideally there should be a nova flag which can be set to pass through
  the libvirt 'unsafe=true' flag. My thinking is that if
  'cache=writethrough' is set then the underlying storage should be
  safe, but perhaps it's best not to make that assumption and rather to
  have a nova.conf flag.

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