Tape drive RHEL5 on IBM P

[ammad shah]

hi all,
i am using RHEL 5 on IBM-P series having IBM Tape drive LTO3. I can backup small size of file/s. but when i try to backup file/files with larger size it stops working.
even i have changed the tape cartrage (disk). but still in trouble. 

root# mt -f /dev/st0 status

SCSI 2 tape drive:
File number=0, block number=0, partition=0.
Tape block size 0 bytes. Density code 0x44 (no translation).
Soft error count since last status=0
General status bits on (41010000):
BOT ONLINE IM_REP_EN


# tar cvf /dev/st0 /etc

tar: Removing leading `/' from member names

/etc/
/etc/DIR_COLORS
/etc/issue.net
/etc/csh.login
/etc/pam_pkcs11/
/etc/pam_pkcs11/pkcs11_eventmgr.conf
/etc/pam_pkcs11/pam_pkcs11.conf
/etc/scrollkeeper.conf
/etc/NetworkManager/
/etc/gdm/modules/AccessKeyMouseEvents

tar: /dev/st0: Cannot write: Input/output error
tar: Error is not recoverable: exiting now


There are (hexadecimal) errors in log file (/var/log/messages) and on console


Jun 14 18:50:44 Mars kernel: ipr: 000003D0: 594A0900 00008000 D0001010 00000000
Jun 14 18:50:44 Mars kernel: ipr: 000003E0: 00000000 00000000 00000000 00000000
Jun 14 18:50:50 Mars kernel: st0: Current: sense key: Unit Attention
Jun 14 18:50:50 Mars kernel:     Additional sense: Power on, reset, or bus device reset occurred



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