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people:priestdo:tips:losetup [2010/01/25 11:16] (current)
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 +====== out of loopback devices ======
 +As a result of a power related issue our Xen server crashed.
 +When it came back up it could not create its full complement of loop back devices.\\
  
 +I saw errors like:
 +
 +  Error: Device 770 (vbd) could not be connected. Backend device not found
 +
 +dmesg, /dev, everything indicated all 32 of the loopback devices were there, but after I used 10, there were no more.
 +
 +``losetup`` saved the day.  With it I was able to see that many loopback devices were in use attached to Xens that were no longer running. ​ I don't know how this situation occurred as it has never been an issue before, but I did:
 +
 +  for node in `seq 0 31`
 +  do
 +  losetup /​dev/​loop$node
 +  done
 +
 +And found quite a few that could be deleted (with losetup -d /dev/loopXX )  and once I did that I was able to bring up the rest of the virtuals.
 +
 +Hope this helps someone else out there.
 +
 +-Greg
 +