I'll be upgrading clusters servers from OES1 SP2 to OES SP2a.

This will be a rolling upgrade.

Do I do cluster leave and delete server from cluster?

This seems to be a permanent removal, but maybe it sounds worse than it is.

Can anyone point me to a TID or cool solution?

I also have a need to remove one of the servers and create a space in cluster rack where other servers could be rolled to.

I plan on migrating a file services only cluster server to a server outside of the cluster for holding. Would I also do cluster leave and then delete node from cluster. I plan on migrating this cluster server which is an OES1 SP2 server to OES2 SP1b. Then when other cluster servers are upgraded, migrate this server back to OES2 SP2a.

Thanks,
Lin