[Veritas-bu] NetBackup DataCenter and L100 tape library

Hi, I'm facing a problem in Veritas NetBackup DataCenter 4.5 server,
installed on Solaris 9 platform (using SunBlade 2000 machine),
connected to Sun StorEdge L100 Tape Library with 4 drives HP LTO-2 and
96 tape slots. This is the first time we want to use the L100 library.
After we installed NetBackup DataCenter 4.5 from CD, we did the setup
using Wizards: Configure Storage Devices, Configure Volumes, Configure
Backup Catalog, and Create a simple Backup Policy "test1" which only
backup server's /etc/ directory (which is localhost) to volume pool
"Test1". We assigned two tapes (A00002 and A00003) to volume pool
"Test1". Every time we run the policy manually, it always failed with
following detailed status:
"12/31/2004 14:40:44 - started process bptm (pid=2852)
12/31/2004 14:40:45 - started process bpbrm (pid=2849)
12/31/2004 14:40:45 - connecting
12/31/2004 14:40:45 - connected; connect time: 0:00:00
12/31/2004 14:40:45 - mounting A00003
12/31/2004 14:41:29 - mounted; mount time: 0:00:44
12/31/2004 14:41:29 - positioning A00003 to file 1
12/31/2004 14:41:36 - positioned; position time: 0:00:07
12/31/2004 14:41:36 - begin writing
12/31/2004 14:41:43 - mounting A00002
12/31/2004 14:42:36 - mounted; mount time: 0:00:53
12/31/2004 14:42:36 - positioning A00002 to file 1
12/31/2004 14:42:43 - positioned; position time: 0:00:07
12/31/2004 14:42:50 - Error bptm (pid=2852) Media Manager pool Test1
has no more unassigned media in robotic device TLD(0)
12/31/2004 14:42:50 - Error bpbrm (pid=2849) from client baksrv: ERR -
bpbkar exiting because backup is aborting
12/31/2004 14:42:54 - end writing; write time: 0:01:18
12/31/2004 14:42:54 - Error bpsched (pid=2832) suspending further
backup attempts for client baksrv, policy test1, schedule Full_ETC
because it exceeded the configured number of tries
12/31/2004 14:42:54 - Error bpsched (pid=2832) backup of client baksrv
exited with status 96 (unable to allocate new media for backup,
storage unit has none available)
unable to allocate new media for backup, storage unit has none available (96)"

It looks like the drive wants to write to the tape, but suddenly the
tape was ejected a few seconds later and another tape mounted until
all media on the pool consumed. This happens every time. FYI the /etc/
directory's size is only 7.5 MB. We are using LTO-2 200/400GB tapes.
We haven't done any backup using the L100 library.

Here's the output of "tpconfig -dl":
# /opt/openv/volmgr/bin/tpconfig -dl
Currently defined drives and robots are:

       Drive Name              HPUltrium2-SCSI0
       Index                   0
       NonRewindDrivePath      /dev/rmt/0cbn
       Type                    hcart2
       Status                  UP
       Shared Access           No
       TLD(0) Definition       DRIVE=4 

       Drive Name              HPUltrium2-SCSI1
       Index                   1
       NonRewindDrivePath      /dev/rmt/1cbn
       Type                    hcart2
       Status                  UP
       Shared Access           No
       TLD(0) Definition       DRIVE=5 

       Drive Name              HPUltrium2-SCSI2
       Index                   2
       NonRewindDrivePath      /dev/rmt/2cbn
       Type                    hcart2
       Status                  UP
       Shared Access           No
       TLD(0) Definition       DRIVE=1 

       Drive Name              HPUltrium2-SCSI3
       Index                   3
       NonRewindDrivePath      /dev/rmt/3cbn
       Type                    hcart2
       Status                  UP
       Shared Access           No
       TLD(0) Definition       DRIVE=2 

Currently defined robotics are:
 TLD(0)     robotic path = /dev/sg/c3t0l0,
            volume database host = baksrv

I have upgraded the software from NetBackup DataCenter 4.5FP_3GA to
4.5FP_6, but still no luck. Can anyone help me out? Thank you, any
help would be very much appreciated.

Best regards,
Kevin Haritmonds