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[John Garbutt <john@xxxxxxxxxxxxxxx>]

This now raises:
Reached maximum number of retries trying to unplug VBD OpaqueRef:50be57f5-7c5a-0e72-7659-38b37608ea2a

Instance goes into the error state.

If the user calls reboot, everything will return to normal.

** Changed in: nova
       Status: Triaged => Invalid

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https://bugs.launchpad.net/bugs/1030108

Title:
  xenapi: bad handling of "volume in use" errors

Status in OpenStack Compute (Nova):
  Invalid

Bug description:
  We have noticed several circumstances (like for example if a volume is
  in a raid, or in use) and detach call is issued, the volume stays in
  the in-use state, and Xen holds on to that volume.  When the volume
  becomes not in use any longer (for example if you remove it from the
  raid, unmount it), Xen will then still have the detach command queued,
  and detach the device.  This may lead to confusing behavior for the
  user.  If a detach fails because it is in use, it should remove the
  queued detach command from the instance so that it isn't detached when
  not in use any more.

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