When you use the Get-Queue cmdlet in Exchange 2013 you will see a Velocity property (not visible in the Queue Viewer tool):
So what exactly is this Velocity? Does zero means no emails is coming in or going out? Is zero a good thing?
The Velocity property is simply the drain rate of the queue. Exchange 2013 measures the rate of messages entering and leaving every queue and stores these values in queue properties. These rates can be used as an indicator of queue and transport server health. There are three properties: Velocity (which we have seen in the previous screenshot) and IncomingRate and OutgoingRate, both visible in the screenshot just below:
Their meaning is as follows:
- IncomingRate
- OutgoingRate
- Velocity