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Global server load balancing (GSLB), or wide-area load balancing, is a more sophisticated version of DNS round robin available from some hardware load balancer vendors. This solution is typically deployed as a hardware device or even as a feature of a hardware load balancer. This type of load balancing uses DNS to load-balance client connectivity between sites based on a number of factors such as location of the client, response time of the servers, availability of the servers, custom weights, and more. GSLB is typically used in multiple site configurations to provide load balancing between sites. To provide full site redundancy the GSLB device should be located outside of either of the load-balanced sites or deployed in multiple sites. One way to use the GSLB is to load-balance Autodiscover to ensure that it is available even during a single site outage. In Figure 11-12, Autodiscover. constoso.com is set up for GSLB all traffic will be sent to the IP address for the Denver Autodiscover service. In the event of a failure of Denver, the GSLB device can send all traffic for Autodiscover.contoso.com to the second site. The GSLB device will accept DNS requests from the client and then return the appropriate IP address based on the rules defined. The TTL for the returned IP address is set low to ensure that changes are received by the client as quickly as possible. As with DNS round robin, because GSLB relies on DNS client resolution, its functionality is limited when the client DNS resolution is uncontrolled.

Autodiscover.contoso.com GSLB Device 131.107.0.55 (Weight 100) 131.107.1.55 (Weight 0)

Autodiscover.contoso.com GSLB Device 131.107.0.55 (Weight 0) 131.107.1.55 (Weight 100)

Displaying a view is more effective than redirecting to an action or to an error page. In the example, the HTML view based on the CustomError template is just the response to invoking an unknown action no extra work and no extra roundtrips.

Table 4-1 lists the register types for pixel shader versions 1_1 to 1_4.

As you can see, you have a variety of solutions to choose from, depending on business requirements and budget. Table 11-4 combines affinity, load balancing, and other considerations when choosing a solution for load balancing.

Automatic Failover Can be used with Windows Failover Clusters Service Health Checking SSL Bridging Enhanced Security AD Authentication Service Health Checking

In ASP.NET MVC, a controller class is not simply a class with a bunch of public methods. It is responsible, for example, for connecting to a number of external components, not the least of which is the gateway to the middle tier. In addition, the controller is responsible for supporting a number of cross-cutting concerns (for example, logging, security, localized information to pass on to the view, or caching).

Limited Scale Cannot be used with Windows Failover Clusters No Service Health Checking Manual failover Unpredictable traffic Long failover time

Table 11-5 summarizes the configuration needed to support all of the Client Access Server protocols. If the load balancer is used to terminate the SSL certificates, the traffic between the load balancer and the Client Access server will be unencrypted; thus, the unencrypted port is used. Each of the services can be provided with separate load-balanced IP addresses to apply different load-balancing policies to each. For more information about configuring certificates and the internal and external URLs for your Client Access servers see 4, Client Access in Exchange 2010.

TCP PORT(S)

Especially for server-based applications, asynchronous operations are a fundamental asset on the way to scalability. In ASP.NET, asynchronous requests take advantage of asynchronous

By default the Outlook client will make a connection to the RPC Endpoint Mapping Service on TCP/IP port 135 on the server to negotiate a dynamic RPC port above TCP 1024 for usage. If no firewalls or load balancers are between the clients and servers this is usually not an issue. You can reduce the number ports that need to be load

Table 4-1

balanced by modifying the Client Access servers to scope down the ports that are required. You must make three modifications:

1. Open the Registry editor and then select HKEY_LOCAL_MACHINE\SYSTEM\

HTTP handlers, which are a feature of the ASP.NET platform since the first version. However, both ASP.NET Web Forms and ASP.NET MVC provide their own facilities to make it simpler for developers to implement asynchronous actions. In particular, ASP.NET MVC 2 provides asynchronous controllers. Important In ASP.NET, asynchronous pages are commonly associated with the idea of

2. Add a DWORD named TCP/IP Port. 3. Set the value of TCP/IP port to selected port number. 4. Close the Registry editor. 2.

Modify X:\Program Files\Microsoft\Exchange Server\V14\Bin Microsoft.Exchange .Addressbook.Service.exe.config file to statically assign the Address Book (NSPI) and Referral Service (RFR) TCP/IP port on all of the Client Access servers.