title: Cinder volume cant attach or detach
body: <p>After a power failure of the host machine, the openstack cinder volumes have entered a state in which they can not be attached nor detached.</p>
  
  <pre><code>~$ nova volume-attach ### ###
  ERROR: Invalid volume: already attached (HTTP 400) (Request-ID: req-###)
  ~$ nova volume-detach ### ###
  ERROR: Invalid volume: already detached (HTTP 400) (Request-ID: req-###)
  </code></pre>
  
  <p>The status of the volume its self is listed as attached</p>
  
  <pre><code>cinder list
  +-----+-----------+---------------------+------+-------------+----------+-------------+
  |  ID |   Status  |     Display Name    | Size | Volume Type | Bootable | Attached to |
  +-----+-----------+---------------------+------+-------------+----------+-------------+
  | ### | available |     volume-data     | 690  |   Storage   |  false   |     ###     |
  +-----+-----------+---------------------+------+-------------+----------+-------------+
  </code></pre>
  
  <p>The volume is not found on the instance even though its listed as attached in the cli and in horizon (the device isnt found in /dev/ nor the mount point in /mnt/)</p>