4.36 Transport_BackPressure

Use this Knowledge Script to monitor the status of back pressure for the Hub Transport server.

Back pressure monitors system resources, such as available disk space and available memory, on computers that have the Hub Transport server role or Edge Transport server role installed. If resource usage exceeds a certain level, the Exchange server stops accepting new connections and messages, but may continue to deliver existing messages. When resource usage returns to a normal level, the Exchange server accepts new connections and messages.

This script raises events for three levels of resource usage:

  • Normal. No back pressure is applied to the server: new connections and messages are accepted.

  • Medium. The resource is slightly overused. Limited back pressure is applied to the server: incoming mail from the authoritative domain is allowed, but new connections and messages from other sources are rejected.

  • High. The resource is severely overused. Full back pressure is applied to the server: all message flow stops, and all new connections and messages are rejected.

This script is a member of the Exchange2007 recommended Knowledge Script Group. For more information, see Section 4.43, Recommended Knowledge Script Group.

4.36.1 Resource Objects

  • Exchange2007_HubTransportServer

  • Exchange2007_EdgeTransportServer

  • Exchange2010_HubTransportServer

  • Exchange2010_EdgeTransportServer

  • Exchange2013_HubTransportServer

  • Exchange2016_HubTransportServer

  • Exchange2019_HubTransportServer

4.36.2 Default Schedule

By default, this script runs every five minutes.

4.36.3 Setting Parameter Values

Set the following parameters as needed:

Parameter

How to Set It

General Settings

Job failure event notification

Event severity when job fails

Set the severity level, from 1 to 40, to indicate the importance of an event in which the Transport_BackPressure job fails. The default is 5.

Monitor Back Pressure Status

Event Notification

Raise event if back pressure is high?

Select Yes to raise an event if resource usage is at a high level. The default is Yes.

Event severity when back pressure is high

Set the severity level, from 1 to 40, to indicate the importance of an event in which resource usage is at a high level. The default is 5.

Raise event if back pressure is medium?

Select Yes to raise an event if resource usage is at a medium level. The default is Yes.

Event severity when back pressure is medium

Set the severity level, from 1 to 40, to indicate the importance of an event in which resource usage is at a medium level. The default is 10.