Before version 2[1], a cluster[2] node was a machine on the network that was running Heartbeat[3].
With the introduction of the new ClusterResourceManager[4], two extra pieces are also mandatory. The ClusterConsensusManager[5] and the ClusterResourceManager[4] itself.
Although it is possible for a node to be fully recognised by Heartbeat[3] without these two extra pieces, it would not be able to participate in ResourceAllocation[6] in the cluster. Thus there are layers of ClusterMembership[7].
Ping Node[8], Primary Node[9]
| [1] | http://www.linux-ha.org/NewHeartbeatDesign |
| [2] | http://en.wikipedia.org/wiki/Computer_cluster |
| [3] | http://www.linux-ha.org/HeartbeatProgram |
| [4] | http://www.linux-ha.org/ClusterResourceManager |
| [5] | http://www.linux-ha.org/ClusterConsensusManager |
| [6] | http://www.linux-ha.org/ResourceAllocation |
| [7] | http://www.linux-ha.org/ClusterMembership |
| [8] | http://www.linux-ha.org/PingNode |
| [9] | http://www.linux-ha.org/PrimaryNode |
This information provided courtesy of the Linux-HA project at http://linux-ha.org/