Expiring Today—Celebrate National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Exchange Name Space

Posted on 2016-07-14
6
Medium Priority
?
232 Views
Last Modified: 2016-07-14
If we have Exchange running in 2 different sites:
A production site where all users connect, and a DR failover site where users connect only when failover ocurrs.
Do we want to have different name space for both sites. so prod will have its own name space and the DR site will
have its own name space. Example:
prod:
prodcasarray.domain.com
prodmail.domain.com

DR:
drcasarray.domain.com
drmail.domain.com

Is this the correct logic for this setup?
0
Comment
Question by:timgreen7077
[X]
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
  • 3
  • 3
6 Comments
 
LVL 42

Accepted Solution

by:
Adam Brown earned 2000 total points
ID: 41711234
You won't want to do that unless you intend to make your users reconfigure Outlook when everything fails or reconfigure the DR server when things fail.

Basically, Exchange server access follows this pattern:
Client Accesses CAS server in some way
CAS Server either Proxies the connection to the Mailbox Database or Reads data from the closest MBX server (Depending on Exchange version. 2013 and later Proxies, prior versions read from the MBX servers)

The Client will always communicate with the Mailbox Server using the Domain's DNS information, so it doesn't matter what you "name" the Mailbox servers. What matters is that there is a DNS entry that points users to a valid CAS server for reading their mailbox.

If you want to make your failover process less painful, make sure that the Virtual Directory Internal and External URLs are all the same on every server in the environment. That means OWA, ECP, EWS, etc should all be configured to use, for example, mail.domain.com. Your CAS Array should *also* be set to use mail.domain.com. The reasoning for this is due to the fact that the Internal and External URLs are all designed as ways for Exchange to forward clients to other servers if needed, and to allow Autodiscover to function. Only Exchange uses those URLs. Your users can use whatever they want to access Exchange as long as it reaches a CAS server.

In a Failover scenario like you have, setting the URLs the same will cut a lot of the work out of the failover process because when you fail over, you will need to change your DNS settings to make mail.domain.com point to the DR server instead of the primary server. When you do that, users will go to that server automatically as long as they are using Autodiscover.

Let me know if you need some clarification. I feel like this whole response may be a little confusing.
0
 

Author Comment

by:timgreen7077
ID: 41711260
So with this scenario:
1 DAG located at primary site. Mailbox servers from primary site and DR site are member servers of the DAG. DB replication between DAG members primary servers and DR servers.

Site1 subnet 192.168.1.0/24
mail.domain.com (cas array, and other virtual directories name space)

Site2 subnet 192.168.5.0/24
mail.domain.com (cas array, and other virtual directories name space) this is the same as site1

Is this the setup you are suggesting with the name space being the same for both sites?
0
 
LVL 42

Assisted Solution

by:Adam Brown
Adam Brown earned 2000 total points
ID: 41711266
Yes. With this setup, your DR server would receive replication of the DB, but no users would ever access it for anything. In the event that the Primary Exchange server(s) fail, you would modify your DNS entry for mail.domain.com (And autodiscover.domain.com) so it points to the IP of the DR server. Users would then only access the DR server until you switch DNS records back to the primary.
0
Learn Veeam advantages over legacy backup

Every day, more and more legacy backup customers switch to Veeam. Technologies designed for the client-server era cannot restore any IT service running in the hybrid cloud within seconds. Learn top Veeam advantages over legacy backup and get Veeam for the price of your renewal

 

Author Comment

by:timgreen7077
ID: 41711270
hmmm, can this be setup in a way where DNS changes are not needed?
0
 
LVL 42

Expert Comment

by:Adam Brown
ID: 41711271
Yes. But it requires a Load Balancer. And if both servers are in different Physical locations, you would have to utilize a much more expensive load balancer that supports multi-site deployments.
0
 

Author Closing Comment

by:timgreen7077
ID: 41711273
thanks
0

Featured Post

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!

Question has a verified solution.

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

How to resolve IMCEAEX NDRs in Exchange or Exchange Online related to invalid X500 addresses.
A list of top three free exchange EDB viewers that helps the user to extract a mailbox from an unmounted .edb file and get a clear preview of all emails & other items with just a single click on mailboxes.
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an antispam), the admini…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
Suggested Courses

718 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