hi,

what is Quorum and File witness ?? what is the functionality ??

Hello

tip: http://goo.gl/VxopGV http://goo.gl/FLAc4p

The below article explain it all:

http://blogs.technet.com/b/scottschnoll/archive/2014/02/25/database-availability-groups-and-windows-server-2012-r2.aspx

Hi Ruban,

Thank you for your question.

File witness server is a server which is separated from DAG. It use quorum to decide if the DAG is work for failover.

Quorum is a mechanism, it use the directory which is on FWS  for quorum purpose where there's an even number of members in the DAG.

We could refer to the following links:

https://social.technet.microsoft.com/Forums/exchange/en-US/521789ef-69cc-47a4-83d3-fb21331f4908/what-is-witness-server-used-for

https://technet.microsoft.com/en-us/library/dd298065(v=exchg.150).aspx

If there are any questions regarding this issue, please be free to let me know. 

Best Regard,

Jim