DAG Failover

I have a 3 member dag all part of the same site, same network running on VM

ExchDAG01 with members
MBX01
MBX02
MBX02

I have setup 2 nics, disabled the recommended features on the cluster NIC.
User run Exchange online, so not in cache mode



When i fail over a database from one active DAG member to the other, users get disconnected for 5-10 seconds. I can figure out why this happens.  With Exchange 2010 it was seamless

Any suggestions would be great.  Thanks
Mike khodabakhshiAsked:
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Mike khodabakhshiAuthor Commented:
I have also tried pointing my computer directly to one of the CAS servers via host file to see if it has anything to do with NLB
Same results
Mike khodabakhshiAuthor Commented:
Just more information on this, even when I reboot the secondary node (passive) I still see outlook disconnect and reconnect??Which is very odd
Mike khodabakhshiAuthor Commented:
Thanks for anyone to add something to this please??  I cant find a simple article that says DAG failover  2013 should be seamless to users.
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MASEE Solution Guide - Technical Dept HeadCommented:
Here is a similar thread regarding the delay for outlook to reconnect when a database switch over to another server. Please read this completelyhttps://social.technet.microsoft.com/Forums/exchange/en-US/85a04340-07bf-4466-b192-dfee4e719d10/exchange-dag-failover-slow-outlook-reconnect?forum=exchangesvravailabilityandisasterrecovery
AmitIT ArchitectCommented:
Purchase and use Layer 7 load balancer. NLB is no more recommended with Exchange. Also this time taken to switch over could be product bug, as now with 2013 they merged almost everything into mbx role and CAS plays a stateless role. like a proxy server, in 2010 CAS use to do lot of  things. I don't have 2013 to test, I suggest you to open MS case and ask for the solution.

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Gareth GudgerSolution ArchitectCommented:
Also, they mentioned at MEC 2014 that the recovery time was greatly reduced if you switched to MAPI over HTTP versus the traditional RPC over HTTP.
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