libobk.a(shr.o) could not be loaded.

http://www.conacent.com

RMAN> run
1> {
2> allocate channel c1 device type SBT_TAPE parms 'ENV=(TDPO_OPTFILE=/usr/tivoli/tsm/client/oracle/bin/tdpo.opt)';

3> backup database plus archivelog;

4> restore validate database; 

5> release channel c1;

6>}

Problem :-

RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03009: failure of allocate command on ch1 channel at 07/21/2008 11:17:14
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management Library
Additional information: 2

Solution :-
Step 1. Login to database user.
Step 2. sbttest test   [ This command will check whether tape drive can be monitor by oracle database or not].
Step 3. If not connected it will show error like this
            libobk.a(shr.o) could not be loaded. 
Step 4. Link the libobk.a with tivoli filesystem because the tape drive is manage by tivoli.
            ln -s /usr/tivoli/tsm/client/oracle/bin64/libobk64.a $ORACLE_HOME/lib/libobk.a
Step 5. Test it first using sbttest command.