In the OPC Int 126.96.36.199 User Guide on page 64, it lists the following information about Warm fail over.
Warm_1: Do not create groups on the server (/fm=1)
Warm_2: Create inactive groups and add PI points (/fm=2)
Warm_3: Create active groups; do not use advise groups (default)
What is unclear to me is option 3. It says "do not use advise groups". Does that mean we cannot use advise tags with Warm 3 fail over?