Start Free Trial

asked on

DAG in exch 2010

Hello,

Is DAG dependent on some majority of nodes. If yes plese help me understand this.

Thanks
Sujith

Hi,

DAG will need one Witness server & if on SP1 it has got secondary witness server option.

you will need to study from scratch to install DAG & design accordingly

may be below link you can start with

http://technet.microsoft.com/en-us/library/dd351172.aspx

http://technet.microsoft.com/en-us/library/dd979802.aspx

http://www.exchange-genie.com/2009/04/database-availability-group-dag-exchange-2010/

http://www.msexchange.org/articles_tutorials/exchange-server-2010/high-availability-recovery/uncovering-exchange-2010-database-availability-groups-dags-part2.html

ASKER CERTIFIED SOLUTION

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

ASKER

If i have 6 mailbox servers and one witness server then at what point the DAG can fail ?

SOLUTION

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

ASKER

Thanks for the assistance...

ASKER

What in case if i have 5 mailbos servers.... then you 2 can and still DAG will be working and in case 3rd fails DAG will fail...

ASKER

What in case if i have 5 mailbox servers.... then you mean to say 2 can fail and DAG will still be working and in case 3rd fails DAG will fail... Right ???

yes, just use the formula
x = the number of servers in the dag

(x-1) divided by 2

ASKER

then iun that if i have 6 servers in DAG how that formula works ????
(6-1)/2 == 5/2=2.5 ????

you can never have an even number
when there is an even number of mailbox servers then active manager adds a file share witness to make it an odd number

ASKER

Great... :)