title: XenServer error after reboot (xenopsd internal error)
body: <p>How to fix? I can't boot anymore</p>
  
  <pre><code>Jan 24, 2014 10:03:29 AM Error: Starting VM 'CentOS 6 (64-bit)' - 
  Internal error: xenopsd internal error: 
  VM = 182361af-d10a-d97b-3a65-346d9cec1bcb; domid = 133; 
  Bootloader.Bad_error Traceback (most recent call last):
  
  File "/usr/bin/pygrub", line 895, in ?
      part_offs = get_partition_offsets(file)
    File "/usr/bin/pygrub", 
  line 105, in get_partition_offsets
  image_type = identify_disk_image(file)
  
  File "/usr/bin/pygrub", line 49, in identify_disk_image
  
  fd = os.open(file, os.O_RDONLY)
  
  OSError: [Errno 2] No such file or directory: 
  '/dev/sm/backend/94b422b6-3e31-88fb-bc55-99b33de9d89a/36bce863-ba6d-4792-b29d-dc6211bd5e8c'
  </code></pre>