I've been reading a lot of scary posts about failed SP1 installs. Is it possible to install SP1 on one DAG member and one CAS server just to see if it will hose something? Is it possible to mount databases from a pre SP1 DAG member to an SP1 DAG member and vice versa? We are using a lot of clients that MS usually doesn't regression test (entourage, IMAP and pop clients, non MS active sync clients) so I would like to be able to quickly roll back if necessary.
I would like to do the following:
1. Upgrade one cas in our array (perhaps shut off the other)
2. Upgrade a DAG member with un active database copies
3. Activate databases on upgraded sp1 DAG member
5. If problems cannot be resolved, fail back to non SP1 DAG member. Roll back or Reinstall RTM on upgraded SP1 CAS and DAG member.
Would this work? If not what is the roll back procedure if any?