Solved

DNS Record Change for Exchange Failover

Posted on 2014-01-16
5
488 Views
Last Modified: 2014-01-31
We are looking to configure\fine tune our Exchange 2010 failover scheme. Currently we have a cas array (via a Kemp Load balancer) in production by the name of CAS00. CAS00 is the RPC server for all of our local Outlook clients.

We also have a CAS server in our disaster recovery site by the name of CAS03. We are thinking, when CAS00 in production goes down, we can manually change the DNS A record of CAS00 to point to the IP address of the DR Cas server. This way the clients still point to the CAS00 RPC server but the DR server is actually handling the exchange requests.

I was told something about creating a cname record that points record to tie into the failover scheme which would have a shorter TTL than the A record to create some sort of DNS redundancy and make the process more automated.

Can anybody shed any light as to how to accomplish this?
0
Comment
Question by:GR JN
  • 2
  • 2
5 Comments
 
LVL 35

Expert Comment

by:Mahesh
ID: 39786876
Yes, you have to change the DNS Record for the CAS Array name in DNS in order to route all connections to the DR CAS Server

Mahesh
0
 

Author Comment

by:GR JN
ID: 39786902
Yes, I know that but is it just the A record or can we tie in a cname record as well?
0
 
LVL 35

Expert Comment

by:Mahesh
ID: 39786946
Cname record is not required

You need to point your existing  CAS server \ CAS Array Host(A) record to DR CAS server

http://social.technet.microsoft.com/Forums/exchange/en-US/704695d4-dfb2-40dd-ad58-46b34dc1aa38/exchange-2010-site-resiliency-cas-array-failover?forum=exchange2010

Mahesh
0
 
LVL 5

Accepted Solution

by:
piwowarc earned 500 total points
ID: 39801587
Hello

DNS is not "state aware" load aware mechanism. You can't achieve any failure aware system that would automatically failover to DR server. For that you need actual load balancer.

Active Load Balancing can be achieved with DNS actually. IT is frequent for high traffic and reslient deployments (do nslookup of google for ex). If you give all servers behind this Kemp LB same name, DNS will return addresses to users at random achieving load sharing. It will still be a bit worse that actual LB you have as it will still give IPs of servers that may have gone down.

In general Load Balancers are way better to do any auto failovers than using DNS.

Regards
0
 

Author Comment

by:GR JN
ID: 39824648
wa
0

Featured Post

Free book by J.Peter Bruzzese, Microsoft MVP

Are you using Office 365? Trying to set up email signatures but you’re struggling with transport rules and connectors? Let renowned Microsoft MVP J.Peter Bruzzese show you how in this exclusive e-book on Office 365 email signatures. Better yet, it’s free!

Question has a verified solution.

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

Following basic email etiquette rules will help you write a professional email and achieve a good, lasting impression with your contacts.
This script can help you clean up your user profile database by comparing profiles to Active Directory users in a particular OU, and removing the profiles that don't match.
In this video we show how to create a Distribution Group 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 Recipients >>…
In this video we show how to create an Accepted Domain 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 Mail Flow >> Ac…

919 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

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now