Henrik,

   We have seen a message very similar.  Are you running multiple copies of
TSM sharing the 3494 library ?  What we find is that if we are trying to
define a drive to system-B while it is in use on system-A, we get the
message.   Make sure that you do not have any SCSI reserves against the
device (possible even if you are fibre attached, so I'm told).

Hope this may help,

Glenn MacIntosh
Manager of Technical Services
Sobeys Inc.
123 Foord St.
Stellarton, Nova Scotia
(902) 752-8371 Ext. 4017