Hmm... Sorry, but that's not how the -targetserver option works.
The sun-acc.xml config file (for several versions of GlassFish and its predecessor) lets you define target-server elements [i]that are in the same cluster[/i] for failover purposes. This new option in v3 (once clustering is supported in v3) will let you specify that same information but on the command line instead.
The values - regardless of where specified - should refer to servers in the same cluster because the app client container will use [i]only one[/i] of those in the list to contact an ORB in a server. Then the ACC's ORB will learn about all other active ORBs in the same server cluster and failover will work among those.
This is quite a different thing from having the ORB in the ACC contact multiple server-side ORBs to know about different runtime environments.
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