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In addition to the information in the TechNet article referenced earlier, the article "How to Change the Location of the Queue Database" explains how to change the location of the message queue database. An Internet search reveals a lack of documentation about what all the settings mean and the effect that a change would have.
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Microsoft developers didn't design this file to be changed by administrators unless absolutely necessary, and they don't provide a UI to view or change settings in the file. The same file is used for both Hub Transport and Edge Transport servers.
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However, apart from saying that the free disk space threshold for the disk that holds the message queue was decreased from 4GB to 500MB in SP1, it doesn't say what other tuning changes Microsoft made to back pressure settings.īefore exploring further, it's important to know that Exchange stores back pressure settings in an XML format application configuration file called in the C:\Program Files\Microsoft\Exchange Server\Bin directory. The TechNet article "Understanding Back Pressure" describes the feature in detail. Given the speed that the transport service processes messages, most users are unaware that a back pressure condition occurred-and why should they care?-unless the server is severely overloaded and the condition persists for several minutes.
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When the condition-usually low memory or disk space-eases, back pressure lifts and normal processing resumes. The underlying idea is that the condition that provoked back pressure is temporary and while it persists the transport service should take care of messages that are en route instead of accepting new connections. When a severe back pressure condition occurs, the server stops accepting incoming messages until all pending outgoing messages are processed. One of the new features related to this transport service is back pressure, a technique that lets the transport service throttle back its ability to receive and process new messages when the server experiences some sort of resource constraint, such as low disk space or memory exhaustion. Microsoft introduced a new transport service in Exchange Server 2007, so it's not surprising that the Exchange developers would have learned from experience in production and used the opportunity presented by SP1 to improve throughput and reliability in this area.