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If you need to support more than eight nodes in your Active Directory site, you must consider a hardware load balancer. Having a dedicated piece of specialized hardware allows for the best performance and a considerable number of features. Most hardware load balancers support multiple affinity types, and even allow for the ability to fall back if one type fails. Typically, hardware load balancers support more advanced node health checks. These range from simple ping tests to measuring response times to custom Web pages. More expensive solutions also provide hardware redundancy, further eliminating any single points of failure. Probably the biggest disadvantage is the cost of deploying a hardware solution. However, for large-scale deployments, this is typically the solution selected.

Here s some sample code that shows the CustomError view. (I ll cover views in the next chapter.)

Application (Intelligent) firewalls, such as Microsoft Threat Management Gateway (TMG) or Forefront Unified Access Gateway (UAG), are similar to the hardware load balancer solution, but can also provide additional security features. For example, with Active Directory Domain Services (AD DS) security groups, you can control what time of the day groups of users can access OWA. One disadvantage is that with this great power comes great complexity. These solutions require more testing and more administration and operational support compared to the other solutions. Another disadvantage is that these do not perform RPC load balancing; in order to do this another solution is also required.

DNS round robin uses DNS s ability to map multiple hosts to a common name. For example, if you have three Client Access servers the DNS A record entries would look like this:

The first client to request mail.litwareinc.com would have the IP address of 192.168.1.2 returned. The second request would have 192.168.1.3 returned, and the third request would have 192.168.1.4 returned. The fourth request would have the first IP address returned again, and the pattern would continue. The main advantage of this is that it has very little or no cost to implement and it s very easy to configure. Unfortunately, the limitations of DNS round robin limit its use to lab environments and very small implementations. These limitations include no support for affinity, which requires the application to maintain affinity. For example, a Web browser navigating to webmail .contoso.com will actually use the IP address the DNS server returns from the name resolution query. Internet Explorer will have this DNS entry cached for about 30 minutes. If the server became unavailable during that cache period, the Web browser could not be automatically redirected to the new server. Because of this caching, the Web browser will attempt to reach an unavailable server until its cache expires. DNS round robin also does not have any health checks or dead node removal. In the preceding example, if 192.168.1.3 becomes unavailable, DNS will continue to return the down host s IP address every third request unless it is manually reconfigured. Another problem is that if multiple clients share the same local DNS server as in a LAN environment, all of those clients will use the same IP address that is cached by the local DNS server; if most of the clients are from the same location, the load will be very balanced across the servers. Finally, changes to DNS can take time to propagate. If a new Client Access server is added to DNS, it will be underutilized until the record propagates fully.

<h2> <% string msg = "Sorry, an error occurred while processing your request."; if (this.ViewData.ContainsKey("Message")) msg = this.ViewData["Message"] as string; %> <% = msg %> </h2>