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Exchange CAS & NLB  - license

Posted on 2014-11-14
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Last Modified: 2014-11-14
Hi,

We would like to leverage on NLB and preconfigure the CAS for DR purpose at DR site

Once setup the Windows NLB, will use
get-outlookanywhere -server $server |select internalhostname (set internal hostname to tcluster’s FQDN)

After that, we will shutdown the the Exchange server @ DR site.

Using this DR method, do we require additional exchange license.
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Question by:Keng0499
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Expert Comment

by:Simon Butler (Sembee)
ID: 40442302
No one on this site can give you an answer on licencing questions - only Microsoft can.
Therefore you need to call Microsoft, ask them and get the answer in writing.

However, the Exchange product team does not recommend WNLB for use with Exchange, mainly because it sucks quite badly.

Furthermore, Exchange expects all servers to be active, and if you shutdown the remote server then it will complain. I presume that you have the mailbox role already in your DR site? If so, just add the CAS role to that server. In the event of a site failure, change the DNS records.
If you have a short TTL time on the DNS records then the change will be effective very quickly.

Simon.
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Author Comment

by:Keng0499
ID: 40442328
Thank. Yes - we have all in-one installation @ DR site. If we use DNS, understood that the Exchange management console can not run.
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Simon Butler (Sembee) earned 2000 total points
ID: 40442331
Not in my experience.
The console will connect to the local machine.

Which version of Exchange are you talking about? If Exchange 2013, then https://localhost/ecp should work.

However in the designs that I do, I always have site specific URLs, as well as the generic URL. Then the problem doesn't occur anyway.

Simon.
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Author Comment

by:Keng0499
ID: 40442360
Yes. It is Exchange 2013. Understood that DNS method for DR purpose only have issue with Exchange 2013 and not prior version.

Our understanding was that using DNS method - the management console and Mobile device will have problem (we dont have mobile in our case).

Will check out.
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Author Closing Comment

by:Keng0499
ID: 40442361
Thanks for helping
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LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 40442956
I have never seen a problem with management console connection using the DNS methods. You can eliminate any chance of a problem by having a unique site URL for each server then having a general URL.
WNLB isn't really going to help anyway, as it doesn't work well over cross site.

Simon.
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