When a startup command is issued,the following errors showed up----
ORA-10997 Another startup/shutdown operation in progress
ORA-09967 Unable to create or open lock file
Linux Error:5 Input/Ouput Error
Initially tired with O/S locks enabling nfslock
chkconfig --levels 35 nfslock on
Which didnot resolve the problem
The problem is with Database lock file in $ORACLE_HOME/dbs which gets created once a database is started, but didnot get killed/deleted because of a sudden shutdown of Database.
The locks exist in the said location as lkinstSID and lkSID.On deleting these files the database started and everything went fine.