We've seen this when a tape or drive goes bad and the whole library
inventory gets screwed up.  An IPL of the STK9710 and then an AUDIT LIBRARY
command usually cleans things up.

James Louie - Nabisco

>Date:    Tue, 31 Mar 1998 13:04:59 -0600
>From:    Sam Mauro <smauro AT QUAKERSTATE DOT COM>
>Subject: STK9710
>
>Hi all...Has anyone out there using an STK9710 tape robot ever seen this
>before.
>We have 7 drives and this particular backup is using 5 of them.
>Thanks in advance, Sam.
>03/31/1998 12:00:16  ANR8300E I/O error on library STK9710LIB (OP=00006C03,
>                     CC=315, KEY=05, ASC=3B, ASCQ=0D,
>SENSE=70.00.05.00.00.00.00.0C.00.00.00.00.3B.0D.00.00.00-
>                      .00.00.00., Description=The destination slot or drive
was
>                      full in an attempt to move a volume).  Refer to
Appendix
>                      B in the 'Messages' manual for recommended action.
>03/31/1998 12:00:16  ANR1401W Mount request denied for volume 000024 -
mount
>                      failed.