Enabling cluster HA and switchless-cluster in a two-node cluster

A cluster consisting of only two nodes requires special configuration settings. Cluster high availability (HA) differs from the HA provided by storage failover, and is required in a cluster if it contains only two nodes. If you have a switchless configuration, the switchless-cluster option must be enabled. Detection of a switchless cluster is automatic.

About this task

Cluster HA ensures that the failure of one node does not disable the cluster. If your cluster contains only two nodes:

Enabling cluster HA requires and automatically enables storage failover and auto-giveback.
Cluster HA is enabled automatically when you enable storage failover.

Note

If the cluster contains or grows to more than two nodes, cluster HA is not required and is disabled automatically.

The switchless-cluster network option is automatically enabled. When the detect-switchless-cluster option is set to false, the switchless-cluster option will need to manually be enabled.

Enter the following command to enable cluster HA: cluster ha modify -configured true
If storage failover is not already enabled, you are prompted to enable it.
If you have a two-node switchless cluster, enter the following commands to verify that the switchless-cluster option is set:
1. Enter the following command to change to the advanced privilege level: set -privilege advanced
  Confirm when prompted to continue into advanced mode. The advanced mode prompt appears (*>).
2. Enter the following command: network options switchless-cluster show
  If the output shows that the value is false, you must issue the following command: network options switchless-cluster modify true
3. Enter the following command to return to the admin privilege level: set -privilege admin

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