Regarding "InvisibleMount" problem, this was APARed and has been fixed in ptf13
which will be available very soon.  You're not seeing things; the mountpoint
internal counter gets corrupted, and the only workaround until 13 is to recycle
the server.  The two error messages you mention have nothing to do with it.


As for the lost VCR data, did you know that you can do "help <msg number>"
and get all the answers to your questions?   Issuing "help 8776" on the
admin client returns:

adsm> help 8776
------------------------------------------------------------------------
ANR8776W  VOLUME volume name IN DRIVE drive name CONTAINS LOST VCR DATA;
ANR8776W  VOLUME volume name IN DRIVE drive name CONTAINS LOST VCR DATA;
PERFORMANCE MAY BE DEGRADED.

EXPLANATION:  The Vital Cartridge Records of the cartridge in the drive are
lost or corrupted.  This results in the inability of the drive to do fast
locates to file positions on the cartridge, which causes the locate performance

for read or append operations to become degraded.

SYSTEM ACTION:  The server continues the operation.

USER RESPONSE:  There are two methods to restore the VCR data.  The first
method uses the MOVE DATA command to move the data off the tape and to return
the tape to scratch or empty status.  The VCR data is rebuilt when the empty
tape is rewritten from the beginning-of-tape. The second method rebuilds the
VCR by loading the tape and locating directly to the end-of-data.  This is done

by ADSM in normal use when new data is appended to the end of the tape.  It can

also be done independently of ADSM by loading the tape in an unused drive and
using the tapeutil program.  Select the tapeutil option "Space to End-of-Data".