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How can I increase the connection limit on VMware systems? PE121

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How do I increase the number of connections accepted by a VMware host system (vCenter) in order to avoid connection timeouts when monitoring such systems with the VMware sensors of PRTG?

In the sensor logs, I receive an error

Timeout caused by wait for mutex. Consider distributing your VMware sensors across several probes! PE121

or

This sensor has not received data for x seconds. Consider distributing your VMware sensors across several probes!

connection help maxconnection pe121 prtg timeout vmware

Created on Jan 17, 2012 12:14:40 PM by  Daniel Zobel [Paessler Support]

Last change on May 6, 2019 11:44:10 AM by  Maike Behnsen [Paessler Support]



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This article applies to PRTG Network Monitor 19 or later

Increasing Maximum Connections for VMware Sensors

If you experience connection failures in your VMware sensors, change your vCenter settings to accept more connections at the same time. If this is not enough, try spreading your sensors over several (remote) probes.

For best performance of VMware sensors, we strongly recommend Windows Server 2012 R2 or later on the computer that is running the PRTG probe with the VMware sensors. In our tests, Windows Server 2012 R2 or later showed a much better performance for VMware monitoring than other operating systems.

Install .NET Updates

A reliability and performance update for .NET Framework 4.0 is available as an optional update (see Microsoft: Reliability Update 2 for the .NET Framework 4).

After installing this update on the machine that is running your PRTG probe, you can run

  • up to 300 VMware sensors with a 60-second scanning interval if your PRTG server (or remote probe) runs on Windows 2012 R2 or later, or
  • 30 VMware sensors in a 60-second scanning interval if your PRTG server (or remote probe) runs on Windows 2008 R2.

Change VMware Settings

Open your vSphere Client settings console from the main menu, select Administration | vCenter Server Settings.... In the Advanced Settings section, change the entry for the key Perf.Stats.MaxCollectionThreads (see screenshots below).

The default value is 2. Change it to 16 to allow the maximum of possible synchronous connections.

Restart the vCenter Server services to activate the changes!



Click to enlarge


Click to enlarge


Spread Sensors over Several Probes

The VMware system counts incoming connections per IP address or machine that the requests come from. If you spread your VMware sensors over several remote probes, this also helps to increase the connection limit.

A Note on Cluster Setups

If you are running a cluster setup, remote probes cannot be clustered, and therefore all sensors running on remote probes will not be fail-safely monitored. In a cluster setup, we therefore recommend that you add your most important VMware sensors to the Cluster Probe (for fail-safe monitoring), the others to one or more remote probes. If you run VMware sensors on the Cluster Probe, each PRTG node in your cluster will create its own connection to the VMware server(s) to query monitoring data. To minimize load, we strongly recommend that you use a scanning interval of 5 minutes or more.

Created on Jan 17, 2012 1:41:53 PM by  Daniel Zobel [Paessler Support]

Last change on May 13, 2019 4:58:07 AM by  Maike Behnsen [Paessler Support]



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.