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Client access Services and physical architecture
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Understanding Client Access planning starts with an understanding of each service and how clients access their mailbox data given different physical topologies.
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autoDiscover
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AutoDiscover plays an important role in creating users mail profiles and providing the client URLs for features such as free/busy, Unified Messaging, and the OAB. Because AutoDiscover information is refreshed when the client starts and at regular intervals (every 60 minutes), it provides a mechanism to move a mailbox around and not have to manually reconfigure every mail client. This interval can be changed with the Set-OutlookProvider by setting the TTL parameter to the number of hours for the interval. However, Windows Mobile devices can use AutoDiscover for its initial profile creation, but it does not reconfigure the client once the profile has been created. The client finds the URL for AutoDiscover differently based on whether the client has internal access or external access.
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Planning Client Access to Exchange ChapTEr 4 159
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Internal clients are clients that are domain joined and can successfully query an Active Directory server for AutoDiscover information. Figure 4-15 shows the process internal clients use for AutoDiscover.
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Domain joined Client
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Directory Server
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Client Access Server
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FIGURE 4-15 Internal AutoDiscover process
1. 2. 3. 4.
Clients search Active Directory for a service connection point object (SCP). Active Directory returns a SCP that includes the location of the client s nearest AutoDiscover service. The client securely (HTTPS) requests AutoDiscover information. The Client Access server returns the best available service URLs for the client request.
An SCP object is created in Active Directory during the Client Access server s installation with an AutoDiscoverServiceInternalURI value equal to that of the FQDN of the server itself. The AutodiscoverSiteScope property is also configured with the Active Directory site that the host was in when the Client Access Server role was installed. This property defines the Active Directory sites that the Client Access server provides coverage for. These properties are never changed automatically, even if the host moves to a different Active Directory site. It is critical to change this property if your standard build process is to install servers and move them to a new Active Directory site when servers are placed into production. As you will see in the example in Figure 4-16, failure to correct the AutodiscoverSiteScope property will result in a Client Access server never being used, potentially being overburdened, or a non-optimal server being selected. Another key concept to understand is that the client attempts to connect to the Client Access server closest to the client computer making the request, but the URLs and configuration the server returns to the client are for a Client Access server in an Active Directory site closest to the user s mailbox. Few organizations will have large numbers of Active Directory sites, but in the event your organization does, you will meet the upper limit of the AutoDiscoverSiteScope property of the SCP object, which can store about 800 entries. If you try to go over this limit your set-ClientAccessServer cmdlet will return an ADMIN_LIMIT_EXCEEDED error. One possible
ChapTEr 4
Client Access in Exchange 2010
workaround is if you have an Active Directory site with more than one Client Access server, you can split up the list among them. For example, assign 400 to one Client Access server and 400 to the other. This only works if you also change the AutoDiscoverServiceInternalURI parameter to reference a load-balanced name that includes all Client Access servers within an Active Directory site. This is discussed further when we discuss load balancing later in the chapter.
Note
If you have a large number of sites that do not have Exchange servers, check out
Brad hugh s blog for a script that automates site assignment: http://blogs.msdn.com/ brad_hughes/archive/2008/05/20/autodiscover-and-client-only-sites-revisited.aspx.
Figure 4-16 has three Active Directory sites, with Client Access servers and Mailbox servers are located in sites A and B. Outlook 2007 clients are located in all sites. By default, the AutoDiscoverSiteScope for the Client Access servers in site A is set to site A. The AutoDiscoverSiteScope for the Client Access servers in site B is set to site B. The client computers in site A will only AutoDiscover to Client Access servers in site A. The client computers in Site B will only AutoDiscover to Client Access servers in site B. Clients in Site C will AutoDiscover to Client Access servers in either site A or site B because none of the Client Access servers is specifically configured to cover site C. This could mean a client in one country could AutoDiscover to a Client Access server overseas, possibly resulting in a poor user experience. To correct this issue, set the AutoDiscoverSiteScope on the Client Access servers in site B to cover sites B and C. Clients in those sites will only use the Client Access servers in Site B for AutoDiscover. This is the optimal setup for this topology.
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