When you edit the vCenter HA cluster configuration, you can disable or enable the cluster, place the cluster in maintenance mode, or remove the cluster.

Before you begin

Verify that the vCenter HA cluster is deployed and contains the Active, Passive, and Witness nodes.

About this task

The operating mode of a vCenter Server Appliance controls the failover capabilities and state replication in a vCenter HA cluster.

A vCenter HA cluster can operate in one of the following modes.

Table 1. vCenter HA Cluster Modes of Operation

Mode

Automatic Failover

Manual Failover

Replication

Enabled

Yes

Yes

Yes

This default mode of operation protects the vCenter Server Appliance from hardware and software failures by performing automatic failover.

Maintenance

No

Yes

Yes

Used for some maintenance tasks. For other tasks, you have to disable vCenter HA.

Disabled

No

No

No

If the Passive or Witness nodes are lost or recovering from a failure, a vCenter HA configuration can be disabled. The Active node continues as a standalone vCenter Server Appliance.

Note:

If the cluster is operating in either Maintenance or Disabled mode, an Active node can continue serving client requests even if the Passive and Witness nodes are lost or unreachable.

Procedure

  1. Log in to the Active node vCenter Server Appliance with the vSphere Web Client and click Configure.
  2. Under Settings select vCenter HA and click Edit.
  3. Select one of the options.

    Option

    Result

    Enable vCenter HA

    Enables replication between the Active and Passive nodes. If the cluster is in a healthy state, your Active node is protected by automatic failover from the Passive node.

    Maintenance Mode

    In maintenance mode, replication still occurs between the Active and Passive nodes. However, automatic failover is disabled.

    Disable vCenter HA

    Disables replication and failover. Keeps the configuration of the cluster. You can later enable vCenter HA again.

    Remove vCenter HA cluster

    Removes the cluster. Replication and failover no longer are provided. The Active node continues to operate as a standalone vCenter Server Appliance. See Remove a vCenter HA Configuration for details.

  4. Click OK.