I’m currently contemplating a high availability FreePBX setup similar to the one you’re describing (mostly because of this issue) only using KVM instead of VMware. Could you share a bit more about how you implemented (or plan to implement) your cluster?
For example, how do you detect when a host goes down and needs to be migrated? As I have seen, the PBX can be totally down while Asterisk and other process are still running. Does VMware handle floating IPs to make sure traffic gets routed to the new host after migration, or do you have a separate solution for that?
Any pointers or links you can give would be much appreciated.