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[Hiroyuki Eguchi <1500337@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

This error occurs under the following situations.

- cinder is using the NFS driver.
- cinder volume is attached to the instance.
- fail to live migrate before destination host attach to the NFS server

We should consider whether destination host has mounted to NFS server or
not when executing rollback of live-migration .

<Error Message>

ProcessExecutionError: Unexpected error while running command.
Command: sudo nova-rootwrap /etc/nova/rootwrap.conf umount /var/lib/nova/mnt/b5e2fcf5ad9470489747f7caa242747b
Exit code: 32
Stdout: u''
Stderr: u'umount: /var/lib/nova/mnt/b5e2fcf5ad9470489747f7caa242747b: not mounted\n'

** Affects: nova
     Importance: Undecided
     Assignee: Hiroyuki Eguchi (h-eguchi)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Hiroyuki Eguchi (h-eguchi)

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https://bugs.launchpad.net/bugs/1500337

Title:
  Rollback of live-migration fails in the case of cinder with the NFS
  driver

Status in OpenStack Compute (nova):
  New

Bug description:
  This error occurs under the following situations.

  - cinder is using the NFS driver.
  - cinder volume is attached to the instance.
  - fail to live migrate before destination host attach to the NFS server

  We should consider whether destination host has mounted to NFS server
  or not when executing rollback of live-migration .

  <Error Message>

  ProcessExecutionError: Unexpected error while running command.
  Command: sudo nova-rootwrap /etc/nova/rootwrap.conf umount /var/lib/nova/mnt/b5e2fcf5ad9470489747f7caa242747b
  Exit code: 32
  Stdout: u''
  Stderr: u'umount: /var/lib/nova/mnt/b5e2fcf5ad9470489747f7caa242747b: not mounted\n'

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