Can I have an Index Cluster runnning on both RHEL 7 and RHEL 8?
We are looking to migrate our Splunk estate from RHEL 7 over to RHEL 8. As we have an existing Index Cluster, the plan is
Running RHEL7 and RHEL8 should be fine as long as both run the same version of Splunk.
Your steps are good with a few changes: don't bother with maintenance mode and don't waste time with rebalance. The off-line step will rebalance the data, anyway. Be sure to off-line one indexer at a time.