This tutorial will demonstrate the steps for deploying Exchange Server 2010 as a Client Access Server array using Windows NLB. This is a demonstration only, and should not be taken as a recommendation to use Windows NLB for your load balancing. A dedicated hardware or virtual load balancer will provide much better performance and capability than NLB can, for any Exchange version.
Two or more Exchange Server 2010 Client Access Servers can be configured as a CAS array using NLB as long they are not also installed as Mailbox servers that are members of a Database Availability Group (DAG).
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Note: In my lab the servers are also Hub Transport servers, and so I installed both sets of pre-requisites. I also use the -Restart switch to automate the restart of the servers, however you can remove this if you wish to control when the servers are restarted.
Note that any existing Outlook profiles will not automatically update from the single Client Access Server to the new CAS array name. Those clients will not automatically failover to an alternate member of the CAS array when there is a server failure. You will need to update those profiles for them to receive the high availability benefits of the CAS array. This is one reason that it is important to establish CAS arrays prior to migrating user mailboxes to Exchange Server 2010.
I see your guide configure ssl certificate for single client access server. so with two CAS server using Windows NLB, how should I configure SSL certificate? Please guide me.
Thanks & Best regards,
I configured as described in the article. But i am not able to ping casarray from DC or from any other client, It gives request timed out. My clients outlook profiles are not configuring. I am using Virtualbox for my lab
Again great article. Question. When our 2010 exchange servers were setup the plan was to use a load balancer appliance so a NLB was not created. I have 2 CAS server, CAS1 and CAS2 and the CAS array names is exchcas.domain.int. load balance is currently just through DNS round robin.
Can I easily create the NLB cluster with these existing CAS servers and keep the same CAS array name? or would it be better to creat new CAS servers in a new NLB cluster?
Hi Paul
Thanks for all the stuff you teach us! One thing that puzzles me is the name space that you use for the clientaccessarray. Does the name space have to be that of the AD domain or can it be the public one in case I use split dns?
Mikael Ljung
My second question is because there are already two existing exchange servers with the CAS, HUB and MBX roles installed, and both members of an active DAG, would creating a CAS Array break the current DAG or environment?
The CAS Array is just an object representing the RPCClientAccessServer for the databases in that site. It has a DNS name that resolved to an IP. That IP can be load-balanced, which is where NLB would come into play. However, NLB is not a good solution for load-balancing Exchange 2010 or any later version of Exchange.
I have a small three server setup (E2010 on W2008R2). I have one server with CAS, HUB and Mailbox and a 2 server DAG set. This environment originally started as a single server setup, but we added the DAG servers and moved all user mailboxes there. No CASArray was ever configured due to this starting as a single server.
We are now interested in adding two new CAS & HUB servers to the environment as a CASArray to get the HA benefits (we use hardware load balancing). The current CAS server is named EH02.domain.com. Can we add the two new servers to the environment, and create a CASArray with the same name as the original server? Once the CASArray is created, it should automatically add the current and two new servers as members. I am just wondering if this will cause a conflict. If it does not cause a conflict, then I can change the DNS for EH02.domain.com to point to the new IP on the load balancer. Then if this all works, the next question is, will this still cause use to have to touch the client machines if they are already pointed to EH02.domain.com?
Q1: Do I need to have GW and DNS address on NLB NIC as well?
Q2: Do I need to use the NLB IP address same as the production subnet?
Q3: When Configuring the NLB, which NIC should I select? Production or NLB?
Am getting a issue dear, i created same scenario but when i set owa default logon format only with username its not working when i access owa with NLB addeess then owa open with domainusername. i want only with username. is there any option which i should set ??????
I have all exchange 2010 roles (HT, CAS AND MB) installed on a single server . i want to have DR for that server on the same site . Is it possible and if so , Can you refer some documents in doing the same .
Everything is working perfect in our organisation, but our Windows based NLB not balance the loads equally,
We are having 4 CAS servers, among that one server getting huge traffic and leads to performance issue on that server.
We already checked the affinity is single, muticast in NLB. still issue persists.
Could you please help on this issue at earliest
Is this right or have I reconfigured something? If it is right then is there any way to get around it? Or is it just the way it is and on the odd occasions that we have to reboot in the middle of the day users will just have to close and re-open where necessary?
I was just rebooting, however it seems as though I need to drain stop it first before doing that. Though some people are suggesting that even doing that you may still get some people getting the prompt.
Hi Paul,
This is a great article for me as i am new for Exchange, I have made my test lab as per you stated above.
Please answer following my questions which will help me to complete my task.
1. Can i set my host name to my CAS Array name?
2. My Second NIC does not work with same subnet on both CAS server to each other CAS server, It is not able to ping..
3. What will happened if my one CAS server goes down on which i have configured CAS Ararry and NLB, my outlook client will be access server mb or not.
The 2010 server I introduced (ex01) was really just temporary hardware hosting only a handful of users at the moment that I imported from another company. I need to introduce the real 2010 server, (ex02), that will host the current 2010 mailboxes, plus the rest of the 2003 mailboxes. What I want to be left with is a single 2010 Exchange server (ex02).
1. Make sure Outlook is closed and not running before running this script;
2. Make sure any unsaved documents/data are saved before running this script as the script will reboot the computer;
3. This script will NOT work for shared PCs where multiple users use the same machine;
4. This script is not tested on Citrix.
My logic is, if I set the NLB array with dedicated NICs on the old CAS server and the new CAS server, create the array in Exchange and point the mailbox DBs to the new CAS Array, when the time comes to decommission the old server it will be as simple as taking the member out of the NLB group (after Exchange has been removed from the old server) and since all of the Outlook clients would already be using the CAS Array the removal of the old server node would not be a factor or issue. Is my logic correct or am I skewed somewhat in my reasoning?
1. If I pull the trigger on creating the CAS array in Exchange via PowerShell, do I have to immediately change the mailbox DBs to point to the array or will everything keep working fine for all Outlook clients?
Thanks for your reply, so I can go ahead and create the CAS Array and it will happily sit there until I go ahead and change the RPCClientAccessServer value on our DB servers when the time comes for us to do it?
Hi Paul, I just set up two member CAS array following these instructions. It seems as though some outlook clients are able to get free/busy but other are not. Is there some configurations that need to be made to have a casarray work with free/busy?
So, if you want EWS connections to be load balanced as well, you would need to set the EWS virtual directory URLs to a DNS name that resolves to a load balanced IP address (which can be an IP on the NLB cluster).
Currently I have exchange 2010 SP1 RU 8 installed on domain controller with all the roles. (I know not the best practice). I have created a new VM with Windows 2K8 R2 SP1 with all the patches and updates. Do you recommend updating the current exchange to the latest service pack which is SP3 and then installing the exchange software on the new VM, then creating the CAS array on the DC and then move mailboxes to new server? Or what is the best way to move forward since I plan to retire the existing DC with exchange and separate out domain controller and exchange. I also have a secondary DC which is a VM.
1.a single load balancer at each location (can this be done with Windows NLB or do we require a hardware load balancer (if so what are the benefits and drawbacks of both)
2.Do I require W2K8R2 Enterprise License for DAG utilization
3.We have a low bandwidth connection so would initial seeding and replication be an issue. FYI in the future we will be upgrading this.
4.Do we still require and Edge Server even though we are using a Sophos Email appliance for mail filtering.
5.Do we still require a MAPI and replication network as thisis a small site and we are using Vmware virtualization.
The answer to your question is No. In fact, it is recommended that you create your CAS array first. Then, any servers you create, in the same Active Directory Site, that are installed with the Client Access Role, will automatically become members of the CAS array; as far as Exchange is concerned. You will, of course, still need to add the new nodes to your Load Balancing solution. 152ee80cbc
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