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cannot allocate channel type sbt on Oracle database server

Posted by oceanswimmer 
I set up ArcServe backup Oracle database. the backup job has been running when it is scheduled from ArcServe Backup Server. However, when I tried to start a manul backup on the database server. I experienced below problem to allocate channel type sbt. error as bellow. libobk.so is a soft link to ArcServe library file. it is accessible to Oracle user.

please kindly help!

ll $ORACLE_HOME/lib/*obk*
/home/app/oracle/product/11.2.0/dbhome_1/lib/libobk.so -> /opt/CA/ABoraagt/libobk64.so

ll /opt/CA/ABoraagt/libobk64.so
/opt/CA/ABoraagt/libobk64.so -> /opt/CA/ABoraagt/libobk.so.2.64_AMD64

ll /opt/CA/ABoraagt/libobk.so.2.64_AMD64
-r-xr-xr-- 1 caroot caroot 210184 Apr 1 2011 /opt/CA/ABoraagt/libobk.so.2.64_AMD64

ll /opt/CA/ABoraagt/sbt.cfg
-rw-rw-r-- 1 caroot caroot 3107 Jan 31 21:51 /opt/CA/ABoraagt/sbt.cfg

------ Error Message -------------

RMAN> run {
2> allocate channel ch1 type sbt;
3> }

using target database control file instead of recovery catalog
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of allocate command on ch1 channel at 02/03/2012 09:20:23
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27023: skgfqsbi: media manager protocol error
ORA-19511: Error received from media manager layer, error text:
SBT error 7501 in function sbtinit2 - sbterror did not return error message

---------- Error logged in Alert.log -------------

Non critical error ORA-07202 caught while writing to trace file "/home/app/oracle/diag/rdbms/tor_uclp/uclp/trace/uclp_ora_8323.trc"
Error message: ORA-07202: sltln: invalid parameter to sltln.

Writing to the above trace file is disabled for now on...
Exception [type] [ADDR] [PC] [flags]
Errors in file /home/app/oracle/diag/rdbms/tor_uclp/uclp/trace/uclp_ora_8323.trc (incident=69073):
ORA-07445: exception encountered: core dump [PC] [SIGSEGV] [ADDR] [PC] [Address not mapped to object] []
Exception [type] [ADDR] [PC] [flags]
Exception [type] [ADDR] [PC] [flags]
Exception [type] [ADDR] [PC] [flags]

------------------ content of trace file -------------------

SKGFQ OSD: Error in function sbtinit2 on line 2917
SKGFQ OSD: Look for SBT Trace messages in file /home/app/oracle/diag/rdbms/tor_uclp/uclp/trace/sbtio.log
SBT Initialize failed for libobk.so

----------------- content of sbtio.log -------------------------
02/03 09:20:23 (21404) - ****************************************************************************************
02/03 09:20:23 (21404) - sbtinit2(): received object type 1461770240, ignore it....
02/03 09:20:23 (21404) - parseFile(): read media server name from par file...
02/03 09:20:23 (21407) - 02/03 09:20:23 (21407) - Error parsing the parameter file /opt/CA/ABoraagt/sbt.cfg
02/03 09:20:23 (21407) - sbtinit2() : An error occurred while reading the sbt.cfg file.
02/03 09:23:02 (21404) - Error reading the pipe
02/03 09:23:02 (21404) - Error parsing the parameter file /opt/CA/ABoraagt/sbt.cfg
02/03 09:23:02 (21404) - sbtinit2() : An error occurred while reading the sbt.cfg file.
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