Our ADSM server is at 2.1.5.12 and runs on AIX.  We have 2 3590 tape drives.
 Every morning after our incremental backups have completed, we issue backup
stgpool commands.  For some reason ADSM dismounts the local pool tape (still
in the tape drive from the incremental backups) and then asks for it to be
mounted again in the same tape drive.  Does anybody know why?  ADSM should
know that the tape he will want for input is still in the drive, so why
doesn't he just use it instead of causing an unnecessary tape mount request.
 Here are the messages from this morning (R00008 and R00012 are in the local
storage pool.  R00071 is in the copy pool.).

05/30/97   05:22:04  ANR1228I Removable volume R00008 is required for
storage
                      pool backup.

05/30/97   05:22:04  ANR8324I 3590 volume R00008 is expected to be mounted

                      (R/W).

05/30/97   05:22:06  ANR8336I Verifying label of 3590 volume R00008 in drive

                      DRIVE1 (/dev/rmt1).

05/30/97   05:23:25  ANR8468I 3590 volume R00008 dismounted from drive
DRIVE1
                      (/dev/rmt1) in library 3590LIB.

05/30/97   05:23:26  ANR8326I 374: Mount 3590 volume R00008 R/W in drive
DRIVE1
                      (/dev/rmt1) of library 3590LIB within 240 minutes.

05/30/97   05:23:27  ANR8336I Verifying label of 3590 volume R00012 in drive

                      DRIVE0 (/dev/rmt0).

05/30/97   05:24:30  ANR8468I 3590 volume R00012 dismounted from drive
DRIVE0
                      (/dev/rmt0) in library 3590LIB.

05/30/97   05:24:30  ANR8326I 375: Mount 3590 volume R00071 R/W in drive
DRIVE0
                      (/dev/rmt0) of library 3590LIB within 240 minutes.