We started off with 1 site all with 2012 servers and Exchange 2010 SP3. This site is in Production and Exchange is fully configured and working. Partial DAG setup was done before second site was up for some reason (not by me).
We have now added a DR site again with 2012 servers and I want to configure a DAG but have faced some issues. Exchange has been installed and updated to same patch level, and thats it so far.
Here are the networks:
Exchange Replication: 192.168.60.140/32
Exchange Replication: 192.168.100.140/32
Note the Replication Networks are tied down to single IP's for other reasons but I dont believe this should cause any issues.
On the Production Exchange Server I first removed all the existing DAG and this is where I faced my first problem. After removing the only member server I went to remove the DAG itself (via EMS) and it completed, although with an error that the Exchange Trusted Subsystem was not added as Local Admin of the Witness Server (it really wasn't).
We ended up in a state where one server showed the DAG had been deleted and one showed it in the GUI still, but unable to do anything with it.
I cant remember exactly what was done but eventually we got it out of both GUI's.
Started to create a new one from scratch. The DAG IP was set to 192.168.61.X. When I added the member servers in (both), it threw up an error (sorry didnt copy it down) that there was an issue DR Site Exchange server and something to do with the DAG IP. It listed as failed but in the GUI it displayed both servers as members.
Again, was unable to do anything in the GUI to remove it. Ended up able to remove it using the -configurationonly switch via EMS.
So now we are back to a blank slate.
I just tried again this morning, and when setting up the DAG it immediately comes up with an error:
Summary: 1 item(s). 0 succeeded, 1 failed.
Elapsed time: 00:00:00
A computer account named 'Company-DAG' already exists and is enabled. The account must be disabled in order to be used by the database availability group.
Click here for help... http://technet.microsoft.com/en-US/library/ms.exch.err.default(EXCHG.141).aspx?v=220.127.116.11&t=exchgf1&e=ms.exch.err.ExE8DEF6
The operation wasn't successful because an error was encountered. You may find more details in log file "C:\ExchangeSetupLogs\DagT
Exchange Management Shell command attempted:
oup -Name 'Company-DAG' -WitnessServer 'server.cswh.com' -WitnessDirectory 'C:\Witness'
Elapsed Time: 00:00:00
I was going to reboot the servers tonight but I have a feeling this will not solve it and that there is remnants of the old DAG's in there somewhere.
What should I do?