What are the best practices/guidelines for this? Currently have a 2-node WSFC running a single SQL instance, but customer wants to install a 2nd SQL instance into the existing WSFC.
Can all the existing resources be used (disk etc.) in the same way for a non-clustered, multiple SQL instance environment? I.e. can I just point the new instance to the existing disks for databases, logs, etc. that are being used for the other instance?
This article suggests you need a WSFC group per cluster instance?! "You must have one WSFC group for each failover cluster instance you want to configure."