How group buffer pool duplexing works

With a duplexed group buffer pool structure, two allocations of the same structure use one connection from each member.

Each structure allocation must be in a different coupling facility. z/OS® prefers to place the structures in coupling facilities that are failure-isolated from one another.

Recommendation: Ensure that at least one of the group buffer pool structures is in a non-volatile coupling facility. If power is lost to both coupling facilities and both coupling facilities are volatile, you must recover the group buffer pool from the logs.