3 Replies Latest reply on Jul 23, 2018 7:22 AM by Belker

    High Availability added resources

    Belker Lurker

      Author :

      URL : http:////docs.vmware.com/en/vRealize-Operations-Manager/6.6/com.vmware.vcom.core.doc/GUID-945EF613-C2E7-4AB6-BCCD-310E7D31E47F.html

      Topic Name : High Availability Considerations

      Publication Name : vRealize Operations Manager 6.6 Help

      Product/Version : vRealize Operations Manager/6.6

      Question :

      The docs in vROPs 6.6 Help for HA under Analytics Nodes state enabling HA doubles the system's compute and capacity requirements. Reading other VMware docs state that HA just requires an extra VM as the Master Replica. Assuming I have 1 Master and 4 data nodes and enable HA without adding a new VM would my landscape be 1 Master, 1 Replica, 3 data nodes. OR will be as mentioned under the Analytics Nodes section be 1 Master, 1 Replica and 6 data nodes (required to add 3 additional data nodes)? I've read other postings were the author suggests the data node infrastructure doubles and I am assuming they are getting their facts from this same VMware write up in vROPs 6.6 Help as I am. I'd like clarification of the real requirements.

        • 1. Re: High Availability added resources
          sxnxr Expert
          vExpert

          It all depends

           

          So if you have 1 master and 4 data ( 5 node cluster) and you enable HA you will have to pick a data node to become the replica so you will still have a 5 node cluster.

           

          Enabling HA will do two things.

           

          1. As the name states it will create a replica of the master (Alarms, policies, custom groups etc) that normal only run on the Master so if you lose the master the replica will take over and all is well
          2. The data nodes will start to duplicate data across the nodes (this includes the Master and replica as they are also data nodes) so you will have an increase in storage requirements.

           

          This next point is maybe where you are seeing the need to increase the node count. Once you enable HA the number of objects and metrics that each data node can handle will drop. You need to make sure that you cluster is sized correctly and may require the additional nodes to take the load of enabling HA

           

          Take a look at VMware Knowledge Base

           

          From the notes section

           

          When High Availability (HA) is enabled, each object is replicated in one of the nodes of a cluster. The limit of objects for HA based environment is half compared to a non-HA configuration. vRealize Operations HA supports only one node failure and you can avoid Single-point-of-failure by adding vRealize Operations cluster nodes into different hosts in the cluster.

          • 2. Re: High Availability added resources
            RickVerstegen Expert

            Hi,

             

            To enable high availability, you must have another node deployed in addition to the master node.

             

            When you enable HA in your scenario, you've 1 Master, 1 Replica and 3 data nodes. One of the 4 data role nodes is changed to a Replica role node.

            In HA, each object is replicated in some nodes of a cluster. HA will use double resources and reduce maximums in half.

             

            Rick

             

            Please consider marking this answer "correct" or "helpful" if you think your query have been answered correctly.

            • 3. Re: High Availability added resources
              Belker Lurker

              Thanks sxnxr, I only caught the creation of the replica node. Having "each object is replicated in one of the nodes of a cluster" pointed out makes it crystal clear.

               

              Thanks again,

              Belker