Re: CAS and Hub load balancing

The original post didn't but my answer covers the DMZ situation.

Please let me add that hardware load balancers are highly preferred over
NLB, but I recognize the cost issue, especially in lower-volume shops.
--
Ed Crowley MVP
"There are seldom good technological solutions to behavioral problems."
..

"Don Wilwol" <donwilwol@xxxxxxxxx> wrote in message
news:OfRZ7lx$IHA.4780@xxxxxxxxxxxxxxxxxxxxxxx
I agree, but lets be clear. It depends. The original post didn't mention a
DMZ. Coming straight from the internet, multiple MX records would be a
better solution. This can be balanced with round robin or redundant with
different weights. Not that I'm saying coming straight from the internet is
the best approach mind you, but many smaller companies do it.

The CAS servers will be load balanced for OWA. HUB can be load balanced
for smtp, but for outbound traffic from EX07, I would think it would be
best to let AD do the work. If your going to use them as a outbound SMTP
relay, then you may want to load balance for redundancy, but that's
somewhat of a unique situation.

I think what your suggesting, and I agree, is if you have smtp relays in
the DMZ, then you'll want to use NLB for redundancy. The better choice
would be multiple Edge servers and multiple HUB servers. You don't need
any additional servers, the server count remains the same.

As for the original question "if I have two Hub transport servers will
they balance the load between them automatically with E2k7", the answer is
"yes".

--


dw

-----------------------------------------------
Don Wilwol
www.atTheDataCenter.com


"Jetze Mellema (MS MVP)" <stoppen@xxxxxxxxxxx> wrote in message
news:B20CD8AB-62D0-4183-B0C4-0D6280CCF00B@xxxxxxxxxxxxxxxx
"news.microsoft.com" <donwilwol@xxxxxxxxx> wrote in message
news:%238S8Sqj$IHA.4800@xxxxxxxxxxxxxxxxxxxxxxx
Use NLB for CAS. The HUB role is redundant native in AD.

You still need something to deliver incoming mail from the DMZ to the
internal Exchange environment. With most solutions you can enter only one
hostname or IP address to deliver the mail to. Without NLB you have to
choose one of the HT servers and of that one is unavailable mail delivery
will fail. So this is why I choose to use the NLB name of the HT cluster.
--
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




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