Exchange 2010 DAG

I will be testing DAG HA in a production environment. We have a production site and a DR site. Replication across both sites are good. Its a 4 node dag with 2 mailbox servers in the prod site and 2 in the DR site. I will run the startdagmaintenance.ps1 script on server 1 which will active the passive copies locally to server 2 according to the DB preferences. But the question is can I also run the startdagmaintenance.ps1 on server 2 also so that the passive DBs will activate on server 3 and 4 in the DR site since both servers in production are in maintenance mode. Can both server 1 and 2 be put in maintenance mode.
LVL 30
timgreen7077Exchange EngineerAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

nashiookaCommented:
I don't use the DAG maintenance script. I perform it's functions manually.  I just read through the code though, looks like there is a default 2 copy minimum which your DAG look like it can satisfy.

My DAG's are configured just like yours 2 servers in one site 2 in another.  Basically I run updates on any 2 servers at a time, the trick is making sure you maintain quorum.  So if you have a 4 node DAG as long as the remaining 2 servers and the witness are up to make the majority (3) you're fine.  Just know thy risks, as an untimely WAN issue could really cause you some problems depending on the servers you're doing maintenance on.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Simon Butler (Sembee)ConsultantCommented:
If you are taking two servers down you are going to need an FSW. You cannot operate a DAG with two nodes active without one.

Simon.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.