A typical issue is ClusterXL under freeze by policy installation. ClusterXL administrator would like to suppress the messages printed by the Cluster Under Load (CUL) mechanism (see sk92723) in the /var/log/messages file and in the dmesg. I always enable this on the cluster to solve this "under freeze" issue.
1) Open vi and add the following settings
# vi $FWDIR/boot/modules/fwkern.conf
add the Line:
2) Reboot all Gateways