Oracle RAC requires the CSS misscount value to be set to 600 seconds with vendor clusterware.
Check the current CSS misscount setting:
# $GRID_HOME/bin/crsctl get css misscount
If the current CSS misscount setting is not set to 600 seconds, update the setting as described in the following procedure.
To update the CSS misscount setting
# $GRID_HOME/bin/crsctl set css misscount 600
# $GRID_HOME/bin/crsctl get css misscount 600