Shulou(Shulou.com)06/02 Report--

In addition to the RPC client access service, Exchange 2010 introduces a new logical structure to the Exchange organization: the client access server array (Client Access Server Array). When a client access server array is defined in an Active Directory site, the array acts as a single point of contact for all client connections in that Active Directory site.

A client access server array can include one or more client access servers, so the client access server array can be used for redundant solutions.

When a client access server array is defined in an Active Directory site, all client access servers in that Active Directory site automatically become part of the client access server array.

Each Active Directory site can have a client access server array, and it is worth noting that the client access server array itself does not provide load balancing and still requires a separate load balancing solution. At present, the popular load balancing solutions are based on hardware and software. the representative products of hardware are F5 and Citrix's Netscaler; software and Netscaler VPX. Of course, the simplest soft load balancing solution is the network load balancing (NLB) that comes with Windows Server. Let's start with why Microsoft introduced the client access Server Array (Client Access Server Array):

1. Why use CAS arrays?

In addition to being part of high availability, there is another important reason to recommend creating a client access server array, even if there is only one client access server in your organization. Because after the client access server array is created, the client connects through the virtual name of the client access server array, rather than directly connecting to the fully qualified domain name (FQDN) of a single client access server. If you need to replace one client access server or add another client access server in the Active Directory site, you do not have to update the configuration file on the client.

The following is a brief description of the steps for adding the load balancer feature that comes with windows and creating a client access server array (without in-depth analysis, there are many similar articles on the Internet searching related topics on their own)

2. Install and configure NLB

1. Install NLB components

On the CAS server, open PowerShell and execute the following two commands:

Import-Module ServerManager

Add-WindowsFeature NLB

two。 Configure NLB components

There are many detailed steps on the Internet, so it will be no problem to follow the wizard step by step, or refer to the official document: create a new network load balancing cluster

3. Configure DNS to parse the cluster FQDN of CAS array

Don't ignore this step, create an A record in DNS that points to the cluster IP address.

Third, create CAS array

In fact, it is very simple. You can use one command:

New-ClientAccessArray-Name-FQDN-site

For example:

New-ClientAccessArray-Name "BJ CAS Array"-Fqdn "bj-cas.lab.net"-Site "BJ"

Apply for a certificate for the client access service

There are many detailed steps on the Internet, so I won't say any more. An empirical suggestion is to write several "user alternate names" at a time, including the FQDN of the CAS array, the OWA domain name of the public network, and so on, so as not to update the certificate every time.

5. Update database RpcClientAccessServer attributes

This is an important step. After the CAS array is created, each new database points to the FQDN of the CAS array, but the old database does not, so it needs to be updated. The command is as follows:

Set-MailboxDatabase "DB_Name"-RpcClientAccessServer CASArray.contoso.com

Update all databases in bulk:

Get-MailboxDatabase | Set-MailboxDatabase-RpcClientAccessServer bj-cas.lab.net

Special reminder:

This is the reason why when you configure an Outlook MAPI client, the name in the server is originally the FQDN of the CAS array, and as soon as you check the name, it changes back to a specific CAS server name.

The method of updating database RpcClientAccessServer properties also applies to redirecting users to a good CAS server.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.