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The intent was to reduce the amount of conversions that needed to happen and thereby reduce the overall resources required on the Exchange Server The streaming database file was discontinued starting with Exchange Server 2007 Beginning with Exchange Server 2007, the development team began peeling out many of these functions from the database to reduce the bloat and sensitivity to any code changes For example, in Exchange 2007 the Outlook Web Access (OWA) was completely rewritten OWA no longer used the Information Store to render the HTML for OWA Also, the Exchange Server 2007 introduced server roles, allowing separation of functionality onto different servers, only needing to run the required roles on specific servers Again in Exchange 2010 additional functionality was removed from the database and moved to other roles.

For example, in Exchange Server 2010, MAPI-based client connectivity has been moved from the Mailbox role to the Client Access Server role Having fewer non-core functions running within the information store process has improved performance and stability and added in additional high-availability functionality..

Direct scripting refers to the idea of having JavaScript code that calls into a publicly exposed endpoint, gets transferred data, and uses client logic for binding and rendering. Figure 9-2 gives an overview of the architecture.

(continued)

When troubleshooting Exchange, an administrator often needs to also troubleshoot related services. Active Directory and the underlying operating system are intimately tied together with Exchange. In many companies the Exchange administrators are separated from the network, DNS, and Active Directory infrastructure. Conversely, these other administrators are often not aware of how dependent Exchange is on these related infrastructure services. More mature organizations that are aware of the inter-relationships often create operational-level agreements (OLAs). OLAs are similar to SLAs the key difference is that the agreements are between internal groups working to support an SLA, and the SLA is the agreement with a business group. To state it a different way, OLAs are created to ensure that core activities performed by different support teams are clearly aligned to meet the agreed-upon business SLAs. This is a fundamental piece of service-level management. As such, Exchange administrators should have enough knowledge to assist other support groups and know where the interdependencies are. Windows Server 2003 introduced the Server Performance Advisor (SPA) to assist in identifying performance-related issues. Unfortunately, this tool is not compatible with Windows Server 2008/R2, but much of the SPA functionality was built directly into Windows 2008 in the performance monitor tool. The addition of data collector sets allows for collections of monitor counters and system traces that are all related to a specific purpose. Windows 2008 comes with a number of predefined collections: Active Directory Diagnostics, System Diagnostics, System Performance, and LAN diagnostics. Frequently when troubleshooting Active Directory, the first things to look at are search performance and LDAP performance. Using data collection sets, as shown in Figure 17-6, makes this easy to do.

After the data has been collected, reports can be generated. Some of the more interesting items are the LDAP client with the most CPU, and the searches with the most CPU. Figure 17-7 shows an example of a report. You can quickly identify any clients consuming large amounts of the server s resources. Additionally, the full search query terms are displayed. Custom applications frequently perform inefficient LDAP searches and might require the use of a Network sniffer to troubleshoot. That typically requires involving groups outside of infrastructure, or deep knowledge of how to read and understand network traces. DNS information can be retrieved with the System Performance data collection. Keep in mind that the report only shows the symptoms of an issue, and the art of troubleshooting is working through a process to determine the root cause.

You may notice that no pre-built data collector sets are specific to Exchange Server. The Exchange team posted role-based XML files that you can use to create a user-defined data collector set. The XML files are at http://blogs.technet.com/mikelag/archive/2010/01/11/ perfwiz-for-exchange-2010.aspx. XML files are currently available for the Mailbox role, and one with all counters. Notes from the field

Rest of the system (Business layer, DAL)

hen you need to create a report of performance file, there is a very useful tool called paL available at http://pal.codeplex.com/Wikipage that enables

you to quickly create a report full of information that can speed up the process of discovering a performance issue and help you with performance troubleshooting. You can also use it to help determine your own thresholds for a specific environment the numbers are just a suggestion that works for the majority of scenarios, but might apply to your particular case. analyze it carefully and trace back issues with the performance monitor numbers.