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Exchange 2007 Back Pressure


Exchange 2007 Back Pressure

Mail may not be flowing due to the Exchange 2007 Back Pressure feature. – ‘

Back pressure is a system resource monitoring feature of the Microsoft Exchange Transport service that exists on computers that are running Microsoft Exchange Server 2007 that have the Hub Transport server role or Edge Transport server role installed. Important system resources, such as available hard disk drive space and available memory, are monitored. If utilization of a system resource exceeds the specified limit, the Exchange server stops accepting new connections and messages. This prevents the system resources from being completely overwhelmed and enables the Exchange server to deliver the existing messages. When utilization of the system resource returns to a normal level, the Exchange server accepts new connections and messages.

The following system resources are monitored as part of the back pressure feature:

  • Free space on the hard disk drive that stores the message queue database.
  • Free space on the hard disk drive that stores the message queue database transaction logs.
  • The number of uncommitted message queue database transactions that exist in memory.
  • The memory that is used by the EdgeTransport.exe process.
  • The memory that is used by all processes.

Read more here – http://technet.microsoft.com/en-us/library/bb201658(EXCHG.80).aspx 

If you low on Disk resources you can edit the EdgeTransport.exe.config to disable Resource Monitoring which will enable Exchange mail flow again.

Here’s how to do it:

1.Open the EdgeTransport.exe.config file from \Exchange Server\bin directory using notepad
2.Add the following key+value pair: <add key=”EnableResourceMonitoring” value=”false” />
3.Save file
4.Restart the Microsoft Exchange Transport Service (MSExchangeTransport): Restart-Service MSExchangeTransport

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