Setup: Exchange 2010 SP3, windows 2008 R2 SP1
mbx01 - mailbox server
mbx02 - mailbox server
CAS01 - CAS/HT server
CAS02 - CAS/HT server
mbx03 - mailbox server
CAS03 - CAS/HT server
All active databases will be located at the Data Centre and a passive copy at the head office apart from head office users who's active database will be local and passive at the Data Centre
An F5 hardware loadbalancer is located at the Data Center and configured with CAS01 and CAS02 as the primary connections and if they are not available CAS03 as the tertiary.
Is this an acceptable configuration or shall I have all databases located at the Data Centre and head office as a DR site only with no active databases. Would make it easier in a DR situation.
How do I ensure that head office users connect to the local CAS Array instead of going across the WAN or does Outlook always look at the local site CAS first?
In the event we lose one site how will the failover occur?