This article describes an issue that can occur with the Orion Module Engine Service restarting due to the VNQM module crashing from an out of memory exception error.
The following error message is seen in the BusinessLayerHost.log:
ERROR SolarWinds.BusinessLayerHost.PlugInstanceSeparateProcess - Instance C:\Program Files (x86)\SolarWInds\Orion\VoIP
Monitor\SolarWinds.Orion.IpSla.NusinessLayer.dll.congif - ProcessID:9468 doesn't exists anymore
ERROR SolarWinds.Common.Ultility.ScheduledTask - CheckPlugins threw and exception.
System.InvalidOperationException: Instance C:\Program Files (x86)\SolarWins\Orion\VoIP Monitor\SolarWinds.Orion.IpSla.BusinessLayer.dll.config
VNQM 4.2 and later
This is due specifically when an Avaya Call Manager environment is configured to send its call records (CDR) and its call metric information (RTCP) to the VNQM server, but the Call Manager was never added into VNQM or was removed.
What happens is the VNQM collector is still receiving the CDR\RTCP data, but has nowhere to place the data. Such data is normally dropped and not collected, but excessive amounts of data arriving to the VNQM server causes the data to be loaded into the memory allocated for VNQM through the Orion Module Engine service until it can be parsed through and compared against the database. Eventually, that amount of data is going to exceed the limits in place for the module's usage and causes it to run out of memory. At that point, the module crashes resulting in the Orion module engine service restarting in an attempt to restart the VNQM module.
There are two methods to this issue: