Users Guide

Figure 4. Two-Member HIT Group in a Non-Cluster Environment
HIT Groups in Cluster Environments
In cluster environments, all cluster nodes in a HIT Group have a reciprocal relationship. Adding cluster Node B to the ASM/ME
instance on cluster Node A will automatically add cluster Node A to the ASM/ME instance on cluster Node B.
You must always add an entire cluster to a HIT Group as opposed to a subset of cluster nodes. ASM/ME will then automatically
set up the trust relationship between each cluster node. If you add only a subset of cluster nodes to a HIT Group, then data
restoration, schedule, and Smart Copy operations could result in fatal errors.
If you run ASM/ME from a cluster node, ASM/ME will warn you if you have not created a HIT Group that includes all the other
cluster nodes. The following figure illustrates a three-node cluster that has been added to a HIT Group.
Figure 5. Three-Node Cluster HIT Group
In this figure, assume you use the Add Hosts option from the ASM/ME instance on Node 1 to add Nodes 2 and 3 to it.
ASM/ME then automatically sets up the following trust relationships between each node, indicated by the bidirectional arrows.
● The ASM/ME instance on Node 1 will have Nodes 2 and 3 added to it. Node 1 can then manage Nodes 2 and 3.
● The ASM/ME instance on Node 2 will have Nodes 1 and 3 added to it. Node 2 can then manage Nodes 1 and 3.
● The ASM/ME instance on Node 3 will have Nodes 1 and 2 added to it. Node 3 can then manage Nodes 1 and 2.
Multiple Cluster Management — Using a Non-Clustered Host
You can use a non-clustered host to manage more than one cluster. From the ASM/ME instance running on the non-clustered
host, you can add the entire set of cluster nodes for all of the clusters that you want to manage. ASM/ME automatically sets up
the appropriate trust relationships between each cluster node.
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HIT Groups