Quick Site Summary for the Exchange Infrastructure:
2x Win2008 Enterprise Edition Servers
2x Exchange2010 Enterprise Licenses
1x Witness Server
Currently configured roles:
Site1-Ex1 - CAS, HUB & Mailbox (DAG Member)
Site2-Ex2 - Mailbox (DAG Member)
Site1 was the primary Exchange server (having migrated from Exch2003), and we've recently brought Ex2 online in a DAG configuration.
Site1 currently services all internal & external requests (Outlook, IMAP, OWA, Outlook Anywhere)
We would like to implement high-availability for network users, but have run into some challenges.
My research has identified that DAG members can't run NLB, so pointing clients within the network to the secondary CAS server looks impossible unless we implement a HLB device, which we don't have the budget for!
Any suggestions how this can be accomplished/implemented?
Would I be able to pre-install & configure CAS & Hub roles on Ex2 and manually cut-over in a worst-case scenario?
Mail is currently routed through a smart-host (which also spools in the event of a colossal outage) so delivering to a secondary exchange server is possible without updating MX Records.
Any advice would be appreciated!