I currently have one on-premises Exchange 2010 Std server sitting on a Windows 2008 R2 Entreprise. The server is backed-up on tape and now I've been asked to add an off-site replication for businness continuity and disaster recovery. The setup is fairly small: about 20 mailboxes on one database.
High availability is not a requirement, I just need to be able to manually activate the off-site server if something really bad happens on the main site.
We have already have a domain controller on a remote site and I was planning to add another one with Exchange 2010 Std/Windows 2008 Ent, setup an active/passive DAG an replicate my database. Since this would be a two node setup, I would also use a file server on the main site as the witness.
My main concern is that I only have one NIC on the remote server, so there would only be one connection between the two nodes. This is a WAN 20 Mbits/s symetrical connection through an IPSec VPN, the ping is well below 100ms (usually <10ms).
I've read many articles on the subjects but all of them assume that you have two NICs on each server. Would a single-NIC connection be an issue in my case?
What about DAC in a two-nodes setup? Would that fit my requirement thatthe off-site node should only active manually?