If I create a compatible group of resources I can then manipulate group members in various ways because they have the same resource type. As an example, performing a plugin config update for a group of JBAS servers, setting the shutdown method.

If I attempt to do this when one or more of the resources is unavailable it will almost certainly fail. The failure generates a massive stack trace, displayed in the update detail for the failure, that I think boils down to the resource being unavailable (is this is specific to JBAS servers?). Also, it can cause a long "in-progress" state for the update.

Perhaps the user should be warned before, or prevented from, performing certain manipulations on groups with mixed availability.