I issued a "query process" command, and ADSM told me there are no
processes running, so I started cleaning tape drives, only to discover
that there is a tape mounted in one of the drives.  It is doing I/O,
and appears to be part of a process that is backing up a storage pool.
(It would be nice if log entries displayed its process number.)

The "query mount" command shows the volume mounted and in use, and
when I use the "STORAGE POOL VOLUME - DETAILS" gui to query the volume,
it shows that the volume is being written to.  I can tell because the
date/time last written keeps changing, and Percent Utilized keeps going
up.  However, ADSM still does not have any processes running.

Has anyone else had this problem?