OK so we currently have 2 active sites (A&B) with an Exchange 2010 SP1 server at each site, with users accessing both and are looking to implement DAG's. We also have a 3rd site (C) that is used for hosting our spam appliances and intranet servers. All sites are connected via a WAN, in the same AD domain and each site is in it's own AD Site.
My main concern with implementing DAG's in this configuration is what happens if I lose WAN connectivity?
I've read that SP1 now supports this type of configuration and helps prevent the potential 'split-brain' situation through the use of DAC (Datacenter Activation Coordination)
I have questions though.
Where should I place my primary FSW?
Should I configure an Alternate FileShareWitness server?
Example: Could I have Site A + FSW and Site B + AltFSW? What would happen if I lost WAN connectivity?
In the future we plan to implement a 4th site with an Exchange server.