We have two VERY highly connected data centres. We have 2 AD sites at the moment. This means 2 CAS arrays.
We have 2 DAG clusters spanning AD sites and 2 NLB CAS arrays.
Would like to move to a single AD site with F5 HW load balancing, benefits are:
1. no more waiting 15 minutes for AD replication, RPC instant replication
2. layer 7 aware load balancer, if a service is down the load balancer will actually know about it
3. No need to worry about different versions of activesync and their ability to figure out the new CAS array with autodiscover
4. No more message to the end user when their database is activated cross site telling them to restart outlook
Now - the question is really to do with what can we do on the network to make this happen? if I lose DC1 how can I have traffic then go solely to F5 in DC2