RMAN (DP6.0) backup failure on Oracle10g

Question

Hello,
I am using DP6.0 with Oracle10g environment for backup.
While I was able to successfully able to allocate the channels I am getting the below error message stack when the backup script is executed.
Thanks
RMAN> CONNECT TARGET *
2> run {
3> allocate channel 'dev_0' type 'sbt_tape'
4> parms 'ENV=(OB2BARTYPE=Oracle8,OB2APPNAME=<SID>,OB2BARLIST=<SID>BAZAORACLE,OB2BARHOSTNAME=server.xx.yy)';
5> backup incremental level 0
6> format '<SID>BAZAORACLE<<SID>_%s:%t:%p>.dbf'
7> database;
8> sql 'alter system archive log current';
9> backup
10> format '<SID>BAZAORACLE<<SID>_%s:%t:%p>.dbf'
11> archivelog all;
12> delete archivelog until time 'sysdate-1';
13> backup
14> format '<SID>BAZAORACLE<<SID>_%s:%t:%p>.dbf'
15> current controlfile;
16> }
17> EXIT
connected to target database: <SID> (DBID=3497973964)
using target database control file instead of recovery catalog
allocated channel: dev_0
channel dev_0: sid=134 devtype=SBT_TAPE
channel dev_0: Data Protector A.06.00/DPWIN_00268
released channel: dev_0
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on dev_0 channel at 06/21/2007 12:00:20
ORA-19506: failed to create sequential file, name="<SID>_BAZA_ORACLE<<SID>_7:625838365:1>.dbf", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Error received from media manager layer, error text:
Vendor specific error: OB2_StartObjectBackup() failed ERR(8010)
Recovery Manager complete.
[Major] From: [email protected] "<SID>" Time: 21.6.2007 12:00:20
     The database reported error while performing requested operation.
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on dev_0 channel at 06/21/2007 12:00:20
ORA-19506: failed to create sequential file, name="<SID>_BAZA_ORACLE<<SID>_7:625838365:1>.dbf", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Error received from media manager layer, error text:
Vendor specific error: OB2_StartObjectBackup() failed ERR(8010)
Recovery Manager complete.
[Major] From: [email protected] "<SID>" Time: 21.6.2007 12:00:20
     Oracle Recovery Manager completed with errors.
[Major] From: [email protected] "<SID>" Time: 21.6.2007 12:00:20
     Backup of target database failed
*************************************************************************************

Answer 1

I changed the tapes and backup drive but problem is standing. Now the message is:
released channel: dev_0
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on dev_0 channel at 07/04/2007 09:11:48
ORA-19506: failed to create sequential file, name="<SID>_BAZA_ORACLE<<SID>_15:627037853:1>.dbf", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Error received from media manager layer, error text:
Vendor specific error: OB2_StartObjectBackup() failed ERR(8010)
Recovery Manager complete.
[Major] From: [email protected] "<SID>" Time: 4.7.2007 9:11:49
[Critical] From: [email protected] "LTO2-1_server" Time: 4.7.2007 9:12:01
IPC Cannot Allocate Shared Memory Segment
     The database reported error while performing requested operation.
[Normal] From: [email protected] "LTO2-1_server" Time: 4.7.2007 9:12:07
     scsi5:0:1:0C
     Medium header verification completed, 0 errors found
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on dev_0 channel at 07/04/2007 09:11:48
ORA-19506: failed to create sequential file, name="<SID>_BAZA_ORACLE<<SID>_15:627037853:1>.dbf", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Error received from media manager layer, error text:
Vendor specific error: OB2_StartObjectBackup() failed ERR(8010)
Recovery Manager complete.
[Major] From: [email protected] "<SID>" Time: 4.7.2007 9:11:49
     Oracle Recovery Manager completed with errors.
[Major] From: [email protected] "<SID>" Time: 4.7.2007 9:11:49
     Backup of target database failed.
Please help me.... I don't have backup 20 days...