I've been tasked with expanding the Exchange 2010 environment for a client and was hoping for some advice. They currently run a single physical Exchange 2010 server with all the roles and have a BES Express server too. They also use Outlook Anywhere.
I've just set up an ESXi cluster and have access to a NetApp SAN. They would like me to expand the infrastructure so that there are 2 x Mailbox servers in a DAG and also 2 x servers in a CAS array. These will all be VMs. I have set these up before in a 2003/2007 - 2010 migration but never as part of an expansion so was wondering:
1. To install these new servers, what is the best order I should follow ie. do the CAS servers first and integrate them and then install 2 new mailbox servers or vice versa?
2. Regarding the NetAPP and the mailbox servers, should I create RDM volumes for the mailbox databases or just assign drives from the existing NFS datastore?
3. What is the best way to minimise disruption while doing all of this and also to keep the BES chugging away (these guys are email nuts and losing emails for a day is unthinkable)
I'd appreciate any assistance or advice you can give. Thanks.