6.3

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When HA is enabled, the cluster can survive the loss of one data node without losing any data.
However, HA protects against the loss of only one node at a time, of any kind, so simultaneously losing
data and master/replica nodes, or two or more data nodes, is not supported. Instead,
vRealize Operations Manager HA provides additional application level data protection to ensure
application level availability.
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When HA is enabled, it lowers vRealize Operations Manager capacity and processing by half, because
HA creates a redundant copy of data throughout the cluster, as well as the replica backup of the master
node. Consider your potential use of HA when planning the number and size of your
vRealize Operations Manager cluster nodes. See “Sizing the vRealize Operations Manager Cluster,” on
page 15.
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When HA is enabled, deploy analytics cluster nodes on separate hosts for redundancy and isolation.
One option is to use anti-anity rules that keep nodes on specic hosts in the vSphere cluster.
If you cannot keep the nodes separate, you should not enable HA. A host fault would cause the loss of
more than one node, which is not supported, and all of vRealize Operations Manager would become
unavailable.
The opposite is also true. Without HA, you could keep nodes on the same host, and it would not make a
dierence. Without HA, the loss of even one node would make all of vRealize Operations Manager
unavailable.
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When you power o the data node and change the network seings of the VM, this aects the IP
address of the data node. After this point, the HA cluster is no longer accessible and all the nodes have
a status of "Waiting for analytics". Verify that you have used a static IP address.
Creating a Replica Node for High Availability
(hp://link.brightcove.com/services/player/bcpid2296383276001?
bctid=ref:video_vrops_create_replica_node_ha)
Run the Setup Wizard to Add a Master Replica Node
You can convert a vRealize Operations Manager data node to a replica of the master node, which adds high
availability (HA) for vRealize Operations Manager.
N If the cluster is running, enabling HA restarts the cluster.
If you convert a data node that is already in use for data collection and analysis, adapters and data
connections that were provided through that data node fail over to other data nodes.
You may add HA to the vRealize Operations Manager cluster at installation time or after
vRealize Operations Manager is up and running. Adding HA at installation is less intrusive because the
cluster has not yet started.
Prerequisites
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Create nodes by deploying the vRealize Operations Manager vApp.
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Create and congure the master node.
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Create and congure a data node with a static IP address.
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Note the fully qualied domain name (FQDN) or IP address of the master node.
Procedure
1 In a Web browser, navigate to the master node administration interface.
https://master-node-name-or-ip-address/admin
2 Enter the vRealize Operations Manager administrator username of admin.
vRealize Operations Manager vApp Deployment and Configuration Guide
28 VMware, Inc.