ORA-27211: Failed to load Media Management Library

ORA-27211: Failed to load Media Management Library

Error description:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of allocate command on dev1 channel at 12/15/2014 21:14:14
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management Library
Additional information: 2

Action:

Make sure media management libraries are installed and the library (libobk.so) is linked under $ORACLE_HOME/lib  to the netbackup library location. (/usr/openv/netbackup/bin/libobk.so64).