Usefull Link for configuring Exchange 2010 and DAG

One important while you configure DAG .The file share witness directory for DAG server will disappear after configuring DAG .It will appear after adding servers to DAG
See the MVP comment regarding this matter

The file share witness directory & share will only show up on whatever server you configured it for (a hub transport is suggested since it is easy and usually fully under the Exchange admin’s control) once you start adding mailbox servers to the DAG and only when there are an even number of mailbox servers in the DAG so that the FSW can create a majority. If you have 1 server in the DAG the FSW won’t show up, but once you add the 2nd node to the DAG it will. If you add a 3rd node to the DAG you will see it disappear again. This ensures there is always an odd # of nodes in the ‘Majority Node Set’ cluster so that proper majority voting can take place and prevent split-brain cluster activation from happening.

About Me

http://social.technet.microsoft.com/Forums/en/exchange2010/thread/f06db99b-2c97-4a5a-80f9-78cb3f614188

http://www.simple-talk.com/sysadmin/exchange/exchange-2010-high-availability/

http://technet.microsoft.com/en-us/library/dd297934.aspx

This blog having new features of Exchange 2010 SP1
http://blogs.technet.com/b/scottschnoll/archive/2010/04/07/first-details-of-exchange-server-2010-service-pack-1-available.aspx

http://www.shudnow.net/2009/11/18/exchange-2010-rtm-dag-using-server-2008-r2-%E2%80%93-part-4/

http://eightwone.wordpress.com/2009/12/24/minimum-ha-exchange-2010-configuration/

http://www.shudnow.net/2009/11/18/exchange-2010-rtm-dag-using-server-2008-r2-%E2%80%93-part-4/

http://www.shudnow.net/2009/11/10/exchange-2010-rtm-dag-using-server-2008-r2-%E2%80%93-part-3/

http://msexchangeteam.com/archive/2010/04/07/454533.aspx

http://blogs.technet.com/b/scottschnoll/archive/2010/04/10/new-high-availability-features-in-exchange-2010-sp1.aspx

This is a very useful link those who are using Exchange

http://www.msexchange.org/articles_tutorials/exchange-server-2010/high-availability-recovery/uncovering-exchange-2010-database-availability-groups-dags-part4.html

http://social.technet.microsoft.com/Forums/en/exchange2010/thread/381570c9-6a7e-4733-bb75-2bb180124876

http://blogs.technet.com/b/formatc/archive/2009/06/12/exchange-2010-database-availability-groups.aspx