Cannot allocate the 1 required device(s)

Hi all,

We are having a problem with a new installation. The new environment has 1 Backup Server and 10 DSN (all of them Windows 2003 Server SP2) which share by FC a jukebox DELL ML6000 and 2 drives IBM LTO-3. The issue is based on following:

There are two volumes mounted on DSN Tapes (or Backup Server), without tasks, when a backup of another DSN is executed with a request of different pool to mounted volumes (if the request needs the same pool to mounted volumes, 7.3.3 does a logical change between path and doesn't unload physically so the backup starts rightly), NetWorker shows the message error:

nsrd: [Jukebox `i500', operation # 6]. Automatically terminating operation `OP_LOAD', instance 6, on jukebox `i500'. Cannot allocate the 1 required device(s).
nsrd: [Jukebox `i500', operation # 6]. Finished with status: failed

and the backup is queued.

Only when NetWorker has to unmount automatically the volumes it's when the error appears. If the Inactivity Timeout is reached or if we run a nsrjb to unmount the volumes (for instance nsrjb -HENvvv), the tapes are unmounted and the backups starts.

Next we write you the done test:

1) Upgrade version 7.4. The same error.

2) Install 7.2.2. The message was the following:
"All of the devices are in use by nsrmmd"

We checked how periodically a nsrjb appeared in the taskmanager to unmount the tapes, but it disappeared quickly. I suppose that this command checked the nsrmmd's state and got an answer telling it they are busy but that is wrong.

3) The RSM Service is stopped in all DSN

4) FW in all components is the newest.

5) No errors appear in Microsoft Event Log.


Thanks in advance.


*We can ensure the pools are rightly configured.