4.3.2 Clustering for Data and Application Availability
vRealize Operations Manager supports application-level HA. Enabling HA has a penalty in the maximum number of objects and metrics that can be stored. With HA enabled, each piece of data contained on the master node is stored twice, halving the maximum number of supported objects and metrics, and doubling the I/O and disk space requirements. See the table in Section
4.4,
Architecture Prerequisites for further details on the maximum amount of objects and metrics in a cluster.
The following are clustering for data and application availability design considerations:
• To enable HA, at least one more data node must be deployed in addition to the master node. If possible when HA is enabled, deploy the replica node within the same cluster and put VMware vSphere Distributed Resource Scheduler™ (DRS) rules in place to keep the replica separate from the master so there is physical redundancy.
• The HA feature of vRealize Operations Manager operates independently of, but complementary to VMware vSphere High Availability.