Tom,

Did the checkout / checkin libvol work ?
have you tried a checkout using mtlib -l /dev/lmcp0 -C -tFF10 -Vvol ?
Which cell does the tape library think the tape is in ( via the
Search database option from one of the menus on the library PC ) - is
the tape actually in that cell ?
We had a similar - if not identical problem to this - when the gripper
had trouble turning 180 degrees to load / unload tapes. The library seemed
to think the tapes were still in the gripper ( or the mouth of the tape
drive ) and thus refused to recognize any operation on the tape - stating it was
inaccessible. Repeated use of the
above mtlib command to manually change the category of the tape
to Eject FF10 and Insert FF00 seemed to fix it.

HTH
Ian Smith
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Ian Smith                            email: ian.smith AT oucs.ox.ac DOT uk
Ian Smith                            email: ian.smith AT oucs.ox.ac DOT uk
Oxford University Computing Services, Oxford, UK.