Starting 2.0.3 release, PowerVC enables you to scale a 3-node cluster up to 5 nodes. Please refer to the Installing PowerVC and Hardware and Software requirements topics before you proceed further. You can also find a few other useful topics at the end of this blog.
An Overview
Using PowerVC OpsMgr, you can create a single node or multinode (3 nodes) PowerVC cluster. The cluster can be extended up to 5 nodes. In this blog, we are taking the example of a 3-node PowerVC cluster and demonstrating the procedure to scale it up to a 5-node cluster.
The image below depicts an example of 3-node cluster in place.
Prerequisites to scale up to 5 node cluster:
- You have created 3 nodes along with one virtual IP (VIP). You can access nodes via virtual IP.
- All nodes are registered using your RHN subscription.
- All nodes have required repos (based on your environment RHEL/SLES) installed.
- All nodes must have the same password.
Health check of services
After PowerVC installation is complete, make sure all services are up and in running state. Run powervc-opsmgr install -c <cluster_name> --validate-install to check the complete health status of all services.
Scale up to 5 node cluster
Provide two more nodes that are identical to the existing node; the nodes must have the same distro or version.
Add node operation is performed on the primary or bootstrap node. Make sure you are logged in to the primary node.
- Run powervc-opsmgr addnodes -c <cluster name> -s. The command captures the IP addresses of new nodes and updates inventory for the cluster. PowerVC can be installed on the new nodes.
- Provide IP addresses of two more nodes to be added. First, you can provide IP/Hostname and password details of the 4th node and then of the 5th (We already have a 3-node cluster.)
After generation of the inventory file, you can validate the same by running powervc-opsmgr inventory -l command.
Results are displayed for a 5-node PowerVC cluster as shown in the image here.
Conclusion
As you have seen, scaling up a 3-node cluster to 5 node cluster is a simple procedure. Hope you have enjoyed reading this blog. Drop your comments or feedback in the ‘Comments’ section.
Useful references:
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Blog authors:
Sri Ram Pisupati
Sravan Kotha