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Question regarding to Exchange 2007 CCR

Posted on 2011-09-19
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Last Modified: 2012-05-12
Hi Guys

I am deploying Exchange 2007 CCR environment from scratch. I just have some questions regarding to witness file share server.

As I know, there is the required servers for Exchange 2007 CCR

* Do I have to install Hub Transport role and Client Access role into Witeness file share server?
   * If Yes, how can I install only Hub Transport role and client Access role in the server? is it just to choose this two roles during exchange installation? any specs for this two roles?
   * If no, when I install exchange 2007 in both cluster nodes, if I choose "Active cluster mailbox role" Does it mean only mailbox role, not other roles will be installed?

* If Hub Transport role and Client Access role have to be installed into witeness server, how can I do the HA for this two roles? Do I need to have two witeness servers with this two roles? How failover can be configured between this two witness servers?

Thanks

Regards
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Question by:mxgong
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17 Comments
 
LVL 49

Expert Comment

by:Akhater
ID: 36565081
the share witness can be an exchange server but it doesn't need to be so you can install HUB/CAS on your share witness or you can configure your share wintess to be any server running windows it doesn't matter.

On the CCR nodes ONLY mailbox roles can be installed so yes only mailbox role be installed


there is no HA for the witness, if the witness fails you will need to move it manually to another server
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Author Comment

by:mxgong
ID: 36565152
Hi Akhater

Thanks for your reply.

So, it means I have to install Hub Transport role and client Access role in the other server (such as witness server), but this two roles cannot be installed into Cluster nodes, right?

If Hub Transport role and client Access role are installed in the witness server or any other server, then if this server goes down, will exchange cluster node still work ? or the exchange will not work? In this case, the server with two roles should be in HA as well, so how can we configure it as failover each other?

Thanks
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LVL 49

Expert Comment

by:Akhater
ID: 36565164
Yes when in a cluster exchange 2007 mailbox role should be installed alone. CAS/HUB should be on separate server

if the share-witness goes down the ccr cluster will still work and you will need to move the share witness to another server


If the hub/cas  fails the cluster will still work but you will have no mail flow / OWA/ ActiveSync etc...

to solve this you will need to install another HUB/CAS and use load balancing between them  
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Author Comment

by:mxgong
ID: 36565194
Are you saying, i can install two HUB/CAS servers, then use network load balance make this two HUB/CAS servers as failover?
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LVL 49

Expert Comment

by:Akhater
ID: 36565200
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Author Comment

by:mxgong
ID: 36565213
Thanks Akhater

The article is saying NLB for CAS, how's HUB? same?
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LVL 49

Expert Comment

by:Akhater
ID: 36565223
HUB doesn't need NLB exchange will manage it internally for all internal and outbound traffic, for inbound emails you can use either NLB or the failover feature of your relay
0
 

Author Comment

by:mxgong
ID: 36565246
Hi Akhater,

I am little confused, in my CCR environment, I will install HUB & CAS role in the witness server. So will NLB work on both HUB & CAS roles?

In my plan:
 * 2 x exchange cluster nodes
 * 2 x witness file share and HUB & CAS roles with NLB?


BTW when you said if witness server goes down, the ccr will still work. does it mean, exchange still works, and users still can receive and sent email?

Thanks
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LVL 49

Expert Comment

by:Akhater
ID: 36565265
sharewitness is another story so let's leave it aside for now


Assuming you install 2 CAS/HUB and you configure NLB on them, while configuring your NLB you will have the options on which ports to configure it, if you do it only for 443 and 80 then you are just balancing the CAS if you add to it 25 you are also doing it for HUB


yes if the sharewintess is down your CCR cluster will still work normally and will be unaffected
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Author Comment

by:mxgong
ID: 36565276
"Assuming you install 2 CAS/HUB and you configure NLB on them, while configuring your NLB you will have the options on which ports to configure it, if you do it only for 443 and 80 then you are just balancing the CAS if you add to it 25 you are also doing it for HUB "

That's very clear to me. Thanks !!!

BTW, if share witness goes down, what will be impacted? if nothing will be affected, why CCR needs share witness? do I need to backup share witness?

Thanks
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LVL 49

Accepted Solution

by:
Akhater earned 500 total points
ID: 36565293
>>BTW, if share witness goes down, what will be impacted? if nothing will be affected, why CCR needs share witness? do I need to backup share witness?<<


here is how it works, you have 2 nodes mailbox exchange + 1 share witness = total of 3 nodes, you can lose any node without effect on the cluster so


if the sharewitness fails and the 2 nodes are still up all will work normally

if one of the exchange nodes fail but the share witness is online then all works normally

if any 2 nodes fails (2 mbx or witness + 1 mbx) then the whole cluster will go down

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Author Comment

by:mxgong
ID: 36565304
Clear!!

Thanks for your help today.

Regards
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Author Comment

by:mxgong
ID: 36565310
Can I keep this question open for one more day? just in case if I have any other questions.

Thank you very much.
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LVL 49

Expert Comment

by:Akhater
ID: 36565315
you are the only one who can decide when to close the question :)

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Author Closing Comment

by:mxgong
ID: 36570871
Excellent.
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Author Comment

by:mxgong
ID: 36570872
Thanks Akhater
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LVL 49

Expert Comment

by:Akhater
ID: 36572618
thank you for the points
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