when I run:
bash-2.05# /usr/openv/netbackup/bin/goodies/available_media
media   media   robot   robot   robot   side/   ret    size     status
  ID     type    type      #     slot    face    level  KBytes
----------------------------------------------------------------------------
CatalogBackup pool

DUPLICATE pool

GK5583  HCART3   NONE     -       -      -       3     272624512        ACTIVE
GK5588  HCART3   NONE     -       -      -       3     59144603 ACTIVE
JZ0656  HCART3   NONE     -       -      -       3     262133907        ACTIVE
GK5578  HCART3   NONE     -       -      -       1     128845389 
ACTIVE/MPX
GK5580  HCART3   TLD      0       24     -       1     270883034 
ACTIVE/MPX
GK5581  HCART3   NONE     -       -      -       3     878321703 
ACTIVE/MPX
JZ0651  HCART3   NONE     -       -      -       3     705547076 
ACTIVE/MPX
JZ0622  HCART3   NONE     -       -      -       -     -        AVAILABLE
JZ0624  HCART3   NONE     -       -      -       -     -        AVAILABLE
JZ0625  HCART3   NONE     -       -      -       -     -        AVAILABLE
GK5579  HCART3   NONE     -       -      -       3     1018824196       FULL
GK5596  HCART3   TLD      0       9      -       3     720274112        FULL
JZ0672  HCART3   TLD      0       27     -       3     933610897        FULL
GK5576  HCART3   NONE     -       -      -       3     1019323389       FULL/MPX
GK5587  HCART3   NONE     -       -      -       3     1094570953       FULL/MPX
JZ0648  HCART3   NONE     -       -      -       3     1221371310       FULL/MPX
JZ0657  HCART3   NONE     -       -      -       3     1114453258       FULL/MPX
JZ0658  HCART3   NONE     -       -      -       3     798428359        FULL/MPX
JZ0670  HCART3   TLD      0       25     -       3     1310467121       FULL/MPX

How do I know that tape is full? Does status indicate that tape is full and I 
cannot write to it any more? What does FULL/MPX mean?

In the collumn where it says size in KBytes does it show what is the amount on 
tape that is written?

Thanks guys for help.

Chris