Link to home
Start Free TrialLog in
Avatar of binumicrosoft
binumicrosoftFlag for United States of America

asked on

Exchange 2010 Site failover with two Stretched DAG

Hello Friends,

I am following the article :

In my Environment i have implemented two Mailbox server in Primary site and two in DR site, FSW is hosted by CASHT01 server in primary site and Alternate FSW in hosted in DR CASHT03 server. In my case what will happen if primary site gose down ? All DB will mount to DR autometically ? Will Alternate FSW will be act as voter node in case of primary FSW fail ? How the mejority and FSW will count if my primary site goes down?
Avatar of Amit
Flag of India image

Read Database Switch & Fail-Overs section given in the same link
That is a great article, I used it to setup a stretched DAG.

When you have a stretched DAG with the FSW at the primary site then if that site goes down you lose the majority share on the DAG and you have to manually intervene in order to bring the failover site up.

I used the below to create the .ps1 scripts needed for the manual switchover process to be made easy for my client - Henrik again of course...
Avatar of binumicrosoft


Hello Guys,

I have configured two mailbox node at each site and two DAG (DAG1 and DAG2). DAG 1 have two member server, one mailbox server of primary site and one mailbox server of secondary site. and the same is for DAG2 aswell. both are streatched DAG. eg. DAG1-mailbox server 1 database passive copy on secondary site - mailbox server 1 and the DAG 2 -mailbox server 2 database secondary site passive copy on primary site mailbox server2.

Can i achieve the automatic site failover? if not then what to do for that?
Avatar of DLeaver
Flag of United Kingdom of Great Britain and Northern Ireland image

Link to home
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
can we configure automatic site failover in exchange 2010, as per our  above setup? if not then how do i  automatic achieve site failover?
Manual intervention is required. You need to have better monitoring in place, so you can act fast.
Just to be clear, if you hosted mailstores for your Company on the secondary site with passive copies on the primary site (where your FSW is located), then if the secondary site goes down then the passive copies will come up at the primary site - if the connection is lost to the second site and the second site Exchange is still up, the mailstores here will become unavailable with the error that connection to the FSW is lost - this prevents split brain.

If you are using this as just failover in the secondary site then when the primary site goes down, you lose all databases until the manual intervention steps are carried out as per my post above
I understand the failover scenario.

Thanks everyone!