Clustering two standalone servers

Hi

I am currently investigating the porting of our product to Glassfish 4. We have a couple of scenarios in which we make use of distributed cache to form our own "Domain" of non-homogenous server instances.

I am trying to map this to the glassfish concepts, but I think I am going against the grain a little with regards the DAS and its clusters. What I really want is to have two glassfish installations; host1 and host2, and configure them as standalone servers talking over the same GMS clustering parameters.

Concepts aside for now, is it actually possible to achieve ?

I have installed two separate glassfish distributions and configured both .../domains/domain1/domain.xml and .../domains/domain1/domain.xml files with the same GMS multicast settings, and specified their membership type to be CORE instead of the default SPECTATOR (for DAS).

I can't see anywhere to switch the DAS type off and I cannot find anywhere to specify override instance names (i.e. on boot up they are set to -instancename server)