Exchange 2007 SP1 ET and HT: NLB or not?

"Jetze Mellema \ · Joined: 05 Aug 2007 Posts: 7

Hi,

I'm designing an environment with 2 Edge Transport servers and 2 Hub
Transport servers. The rest of the design consists of 2 CAS servers (NLB)
and CCR for the MB role.

To make the ET servers available I can choose for 2 MX-records and redirect
both to an ET server. So all the incomming mail will go to the first server,
unless it is not available and the second server will act as fall back
server. Or use NLB and put both servers behind a single MX record?

The same question about the Hub Transport server, use NLB or not? Why?
--
Met vriendelijke groet,

Jetze Mellema (MS MVP)
Lees mijn blog: http://jetzemellema.blogspot.com/
Mijn hobby: http://www.mellema.net/homecomputers
How to ask a question: http://support.microsoft.com/?id=555375

Archived from group: microsoft>public>exchange>design

Leif Pedersen [ MVP] · Joined: 05 Aug 2007 Posts: 232

Hi,

For high availability for the edge servers you create 2 MX records and point
each MX record to its own edge server.

HUB servers are load balanced automatically.

Leif

"Jetze Mellema (MS MVP)" skrev i meddelelsen @microsoft.com...
> Hi,
>
> I'm designing an environment with 2 Edge Transport servers and 2 Hub
> Transport servers. The rest of the design consists of 2 CAS servers (NLB)
> and CCR for the MB role.
>
> To make the ET servers available I can choose for 2 MX-records and
> redirect both to an ET server. So all the incomming mail will go to the
> first server, unless it is not available and the second server will act as
> fall back server. Or use NLB and put both servers behind a single MX
> record?
>
> The same question about the Hub Transport server, use NLB or not? Why?
> --
> Met vriendelijke groet,
>
> Jetze Mellema (MS MVP)
> Lees mijn blog: http://jetzemellema.blogspot.com/
> Mijn hobby: http://www.mellema.net/homecomputers
> How to ask a question: http://support.microsoft.com/?id=555375

"Jetze Mellema \ · Joined: 05 Aug 2007 Posts: 7

"Leif Pedersen [ MVP]" wrote in message @microsoft.com...

Hi Leif,

> For high availability for the edge servers you create 2 MX records and
> point each MX record to its own edge server.

Thanks, I know that this is possible. But as I mentioned this is only a
fallback solution, no true load balancing. Because as long as the first
server can be reached, the second server will not receive any mail. So I was
wondering how you people do this, and why? Any pros or cons for NLB?

> HUB servers are load balanced automatically.

I understand. But since SP1 it's also possible to use NLB for HT servers.
Does anybody use that, why? Best practices?
--
Met vriendelijke groet,

Jetze Mellema (MS MVP)
Lees mijn blog: http://jetzemellema.blogspot.com/
Mijn hobby: http://www.mellema.net/homecomputers
How to ask a question: http://support.microsoft.com/?id=555375

Oliver Moazzezi [MVP] · Joined: 02 Oct 2007 Posts: 583

If you stager the priority on the MX records then it the second Edge will
only recieve mail when the Primary MX is not responding/down.

Oliver

Andy David {MVP} · Joined: 05 Aug 2007 Posts: 397

On Thu, 31 Jan 2008 20:51:45 -0000, "Oliver Moazzezi [MVP]"
wrote:

>If you stager the priority on the MX records then it the second Edge will
>only recieve mail when the Primary MX is not responding/down.

If anything, it will receive more mail the higher priority mx record.
Most of that will be spam.

>
>Oliver
>

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