DAG Failover

Posted on 2014-10-10
Last Modified: 2016-06-14
I have a 3 member dag all part of the same site, same network running on VM

ExchDAG01 with members

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
Question by:Mike khodabakhshi
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Author Comment

by:Mike khodabakhshi
ID: 40373570
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

Author Comment

by:Mike khodabakhshi
ID: 40374211
Just more information on this, even when I reboot the secondary node (passive) I still see outlook disconnect and reconnect??Which is very odd

Author Comment

by:Mike khodabakhshi
ID: 40374296
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.
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

LVL 25

Expert Comment

ID: 40374469
Here is a similar thread regarding the delay for outlook to reconnect when a database switch over to another server. Please read this completely
LVL 43

Accepted Solution

Amit earned 250 total points
ID: 40377490
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.
LVL 31

Assisted Solution

by:Gareth Gudger
Gareth Gudger earned 250 total points
ID: 40377631
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.

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Antivirus on Exchange 3 40
Exchange 2010 Creating an alias & testing it 2 39
Removing Exchange 2003 3 17
Exchange 2013 on premise  mailbox  issue 2 37
This article lists the top 5 free OST to PST Converter Tools. These tools save a lot of time for users when they want to convert OST to PST after their exchange server is no longer available or some other critical issue with exchange server or impor…
This article explains how to install and use the NTBackup utility that comes with Windows Server.
In this video we show how to create an Address List in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Organization >> Ad…
The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question