When multiple logical servers are assigned to a single login policy, no overlap in node membership is allowed among those logical servers, including the logical membership of the coordinator.
An automatic membership overlap check is enforced during changes to:
Logical server membership — If one or more member nodes are added to a logical server, each login policy that allows access to this logical server is examined to ensure that the new membership does not overlap with memberships of other logical servers assigned to the login policy. Attempt to change a logical server membership fails if such an overlap occurs.
Logical server assignment of a login policy — If one or more user-defined logical servers are added to a login policy, a check ensures that the new logical server assignment of the login policy does not cause a membership overlap among assigned logical servers. Attempt to change logical server assignment for a login policy fails if such an overlap occurs.