Users Guide

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.

The non-clustered host can manage each cluster. The following figure illustrates this HIT Group configuration.

HIT Groups