Exchange 2010 CAS server

CCCR
CCCR used Ask the Experts™
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I have 2 mailbox, 2 hub transport/CAS in my enviroment. I installed the NLB for both transport/cas servers and set up the CAS array by doing the Get-MailboxDatabase | Set-MailboxDatabase -RPCClientAccessServer "myserver.mydomain.com" and everything works correctly. The problem after that is that when my second hub transport server is powered on that some people can connect to outlook and some people cant. I went around and pointed those users to cas array ip address and it says that exchange is offline. If i point them straight to the first cas server it converts it to the cas array and lets them connect.
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AmitIT Architect
Distinguished Expert 2017

Commented:
You also need to Set the DB's to this CAS array. Say, if you created the DB before setting up CAS array, then you need run a command to set old db to CAS array. Newly created db's doesn't required anything.

Read this
http://exchangeserverpro.com/how-to-install-an-exchange-server-2010-client-access-server-array
Jon BrelieSystem Architect

Commented:
In NLB manager does it say that the nodes are converged?  Does OWA work on each node directly?

We had an issue with our NLB not functioning outside the main subnet and found that we needed to disable DNS broadcasting on the NLB nics AND add a static ARP entry on our switches for the vIP's MAC address.

Author

Commented:
Both of my mail stores are pointing to the Cas array
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Author

Commented:
yeah owa works correctly no matter which one I point to.
Jon BrelieSystem Architect

Commented:
How are your wNLB nodes configured?  How many Nics?  Unicast or multicast?  Are you using a gateway on the NLB nic?

Author

Commented:
hub02 has a teamed nic (it is physical), hub01 is virtual and only has one nic. it is multicast and I dont see a place for a gateway. port rules are set to equal
Jon BrelieSystem Architect

Commented:
Hrmm... teaming might not work with wNLB.  Also it is recommended that you have dual nics on each node.

take a look at this config guide:  http://blogs.kraftkennedy.com/index.php/2009/11/25/configuring-nlb-for-exchange-2010-cas-load-balancing/

I found that I DID require a default gateway for each NLB nic.  (Seems to be a 2008 vs. 2003 issue dealing with the new weakSend and weakReceive options)
Commented:
I ended up making both physical servers and NLB magically worked after that. The other solution is to add a static arp in the routers.

http://blogs.technet.com/b/networking/archive/2009/01/15/unable-to-connect-to-windows-server-2008-nlb-virtual-ip-address-from-hosts-in-different-subnets-when-nlb-is-in-multicast-mode.aspx

Author

Commented:
Talked with microsoft, this is what they told me to do to fix this issue.

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