Change Release OS REDHAT from 6.5 to 7.2 and VCS 5.1sp1rp4 upgrade
- 8 years ago
HAD does not support connections from a different version of binaries, engine_A.log will show that and won't allow a node with different VCS version to join the cluster and you can't install VCS 5.1 on RHEL 7.2. With these limitations you have limited options especially if you are looking to minimise the downtime
The best option I see is to upgrade SF/HA to 6.2.1 in-place with RHEL 6.5, then build a new temporary node with RHEL 7.2 (or 6.5) and SF/HA 6.2.1 (you will need some patches to get it working but it is supported), join it to the cluster (this part is not supported if you use RHEL 7.2 but will work as long as HAD binary version is the same across all nodes), failover the workload to the new node and rebuild remaining nodes with RHEL 7.2 and SF/HA 6.2.1. Then failback the workload to RHEL 7.2 nodes and remove the temporary node from the cluster.
If you want a fully supported process, then just build a parallel system on new nodes with RHEL 7.2 and SF/HA 6.2.1 and switch the disks over to it.
I've done a few similar upgrades recently and both options worked fine.