RHEL5 rhcs cluster nodes will try to fence each other if they lose multicast cluster communications between nodes.In these types of problems the culprit is almost always a failure or configuration issue with multicast at the network switch.EnvironmentRed Hat Cluster SuiteDiagnosing the problem1. On all cluster nodes enable recognition of icmp broadcasts:echo 0 >/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts2. On all cluster nodes run "cman_tool status" and note:A....

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