You perform cluster and node maintenance procedures to help your vRealize Operations Manager perform more efficiently cluster and node maintenance involves activities such as changing the online or offline state of the cluster or individual nodes, enabling or disabling high availability (HA), reviewing statistics related to the installed adapters, and rebalancing the workload for better performance.

You perform most vRealize Operations Manager cluster and node maintenance using the Cluster Management page in the product interface, or the Cluster Status and Troubleshooting page in the administration interface. The administration interface provides more options than the product interface.

Table 1. Cluster and Node Maintenance Procedures

Procedure

Interface

Description

Change Cluster Status

Administration/Product

You can change the status of a node to online or offline.

In a high availability (HA) cluster, taking the master or replica offline causes vRealize Operations Manager to run from the remaining node and for HA status to be degraded.

Any manual or system action that restarts the cluster brings all vRealize Operations Manager nodes online, including any nodes that you had taken offline.

If you take a data node that is part of a multi-node cluster offline and then bring it back online, the End Point Operations Management adapter does not automatically come back online. To bring the End Point Operations Management adapter online, select the End Point Operations Management adapter in the Inventory Explorer and click the Start Collector icon .

Enable or Disable High Availability

Administration

Enabling or disabling high availability requires the cluster to have at least one data node, with all nodes online or all offline. You cannot use Remote Collector nodes.

Disabling high availability removes the replica node and restarts the vRealize Operations Manager cluster.

After you disable high availability, the replica node vRealize Operations Manager converts back to a data node and restarts the cluster.

Generate Passphrase

Administration

You can generate a passphrase to use instead of the administrator credentials to add a node to this cluster.

The passphrase is only valid for a single use.

Remove a Node

Administration

When you remove a node, you lose data that the node had collected unless you are running in high availability (HA) mode. HA protects against the removal or loss of one node.

You must not re-add nodes to vRealize Operations Manager that you already removed. If your environment requires more nodes, add new nodes instead.

When you perform maintenance and migration procedures, you should take the node offline, not remove the node.

Configure NTP

Product

The nodes in vRealize Operations Manager cluster synchronize with each other by standardizing on the master node time or by synchronizing with an external Network Time Protocol (NTP) source.

Rebalance the Cluster

Product

You can rebalance adapter, disk, memory, or network load across vRealize Operations Manager cluster nodes to increase the efficiency of your environment.