RAC: CRS-4640: Oracle High Availability Services is already active

Error:

/opt/grid/11.2.0.3/bin/crsctl start crs

CRS-4640: Oracle High Availability Services is already active

CRS-4000: Command Start failed, or completed with errors.

-bash-3.2#

Reason:

sometimes when CRS server reboot it try to create sockets under /tmp/.oracle or /var/tmp/.oracle and there are already previous socket files...which are protecting to create new sockets.

Solution:

login with root user and remove all files under /tmp/.oracle or /var/tmp/.oracle restart CRS on faulty node or even reboot that machine!, start the crs and it will come up