ServerNet Cluster Manual

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Upgrading a ServerNet Cluster

ServerNet Cluster Manual—520575-003

4-4

Planning Tasks for Upgrading a ServerNet Cluster

Planning Tasks for Upgrading a ServerNet

Cluster

Four tasks in planning to upgrade a ServerNet cluster are as follows:

•

Task 1: Identify the Current Topology on page 4-4

•

Task 2: Choose the Topology That You Want to Upgrade To on page 4-6

•

Task 3: Fill Out the Planning Worksheet on page 4-9

•

Task 4: Select an Upgrade Path on page 4-12

Task 1: Identify the Current Topology

To identify the supported upgrade paths for a cluster, you must know the topology and

the number of cluster switches currently used by the cluster. The topology refers to the

physical layout of components in a network. In a ServerNet cluster, the topology

defines the maximum size of the cluster and how cluster switches on the same fabric

are interconnected.

To identify the topology, use SCF or the TSM Service Application to check the

configuration tag for all cluster switches on both fabrics:

•

Using SCF:

1. Log on to any node in the cluster

2. Use the SCF INFO SWITCH command:

>SCF INFO SWITCH $ZZSMN

3. Compare the Configuration Tag information with the supported configuration

tags shown in Table 4-3

•

Using the TSM Service Application:

1. Log on to any node in the cluster.

2. In the Management window, click the Cluster tab.

3. Expand the External_ServerNet fabric resource.

4. Click the X or Y switch resource to select it.

Note. Counting the number of nodes or the number of cluster switches is not always an

accurate way to determine the topology. Subsets of the split-star and tri-star topologies can be

constructed that contain the same number of cluster switches and nodes as a cluster using the

star topology.

If your cluster has multiple cluster switches per fabric, it uses either the split-star or tri-star

topology. If three cluster switches per fabric are used, you can be certain the cluster uses the

tri-star topology. If only one cluster switch per fabric is present, the cluster might use any

topology.