I'm currently attempting to add a second Exchange 2007 server to our domain. The idea is to have it setup with SCR at our disaster recovery site so that in case of emergency we have a known good, working Exchange server with most of our data that's ready to go. We currently only have one Exchange server and approximately 200 users.
I installed Windows Server 2008 R2, then installed Exchange SP1. During the install it failed with the Mailbox Role not being added. Afterwards it all looked similar to the current working Exchange server though. I went ahead and attempted to install SP2, which is what our current Exchange server is at. This gave me the error about a
previous install not completed. I found several articles online pointing out where the Watermark registry key was and suggestions to delete that to finish the install. I ran the setup from the command prompt the next time and saw the error (I assume the original error and cause for the Mailbox Role not being installed)
First Storage Group in Active Directory already exists. Upon another registry inspection I see that I missed the Action entry that was near the Watermark (which they also suggested to remove), so now I've got both of them removed and am wanting to install SP2.
The thing is, I'm hesitant now because of the Active Directory error. I'm assuming I can run this and install a second Exchange server in the same domain with no interference, right? So herein lies my primary question: so as to not interrupt services with our current working server, can I continue with the install? Is the error it's giving OK? Of course it's not going to be able to add that First Storage group, it already exists on the other server... but what do I need to do so that it is a clean install?
Any help on how best to proceed is greatly appreciated. My end goal is simply to have a backup server running Exchange 2007 just like our current, running SCR so that our data is being backed up offsite and can with minimal effort be turned into our primary server should a disaster occur.