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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