System Center 2019+ Virtual Machine Manager Host Memory Utilization

Microsoft.SystemCenter.VirtualMachineManager.HostMemoryUtilizationMonitor (UnitMonitor)

Monitors the host memory utilization

Knowledge Base article:

Summary

This monitor tracks how much memory on the host is being used, in megabytes. The available memory for the host is less than the threshold.

Causes

The virtual machines running on the host are consuming critical levels of host memory.

Resolutions

To free additional host memory, migrate a virtual machine to another host. To have Virtual Machine Manager automatically load-balance host clusters, enable the dynamic optimization feature. For information about dynamic optimization, see the Virtual Machine Manager documentation.

Element properties:

Target

Microsoft.SystemCenter.VirtualMachineManager.Discovery.HyperVHost

Parent Monitor

System.Health.AvailabilityState

Category

AvailabilityHealth

Enabled

True

Alert Generate

True

Alert Severity

MatchMonitorHealth

Alert Priority

Normal

Alert Auto Resolve

True

Monitor Type

Microsoft.SystemCenter.VirtualMachineManager.Performance.PowershellBasedConsecutiveSamplesTwoThresholdsMonitorType

Remotable

True

Accessibility

Public

Alert Message

Host Memory Utilization is high

Host memory utilization is {1} and has exceeded the warning or critical levels for {0}

RunAs

Default

Source Code:

<UnitMonitor ID="Microsoft.SystemCenter.VirtualMachineManager.HostMemoryUtilizationMonitor" Accessibility="Public" Target="VMMDiscovery!Microsoft.SystemCenter.VirtualMachineManager.Discovery.HyperVHost" ParentMonitorID="SystemHealth!System.Health.AvailabilityState" Remotable="true" TypeID="Microsoft.SystemCenter.VirtualMachineManager.Performance.PowershellBasedConsecutiveSamplesTwoThresholdsMonitorType">

  <Category>AvailabilityHealth</Category>

  <AlertSettings AlertMessage="Microsoft.SystemCenter.VirtualMachineManager.HostMemoryUtilizationMonitor.AlertMessage">

    <AlertOnState>Warning</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>MatchMonitorHealth</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</AlertParameter1>

      <AlertParameter2>$Data/Context/SampleValue$</AlertParameter2>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState ID="MemoryUtilizationReachedWarning" MonitorTypeStateID="ConditionWarn" HealthState="Warning"/>

    <OperationalState ID="MemoryUtilizationReachedError" MonitorTypeStateID="ConditionError" HealthState="Error"/>

    <OperationalState ID="MemoryUtilizationIsSuccess" MonitorTypeStateID="ConditionSuccess" HealthState="Success"/>

  </OperationalStates>

  <Configuration>

    <IntervalSeconds>180</IntervalSeconds>

    <TimeoutSeconds>180</TimeoutSeconds>

    <WarningThreshold>90</WarningThreshold>

    <CriticalThreshold>95</CriticalThreshold>

    <NumSamples>3</NumSamples>

    <hostComputerName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</hostComputerName>

    <ScriptBody><Script># Copyright (c) Microsoft Corporation. All rights reserved.

# Powershell source code

# HostMemoryUtilizationCounter.ps1



# This Script is used to check the Host memory utilization

# Alert when the utilization of this partition is high:

# Warning: WarningThreshold%, like 80%

# Critical: CriticalThreshold, like 90%



param($hostComputerName)



$momAPI = new-object -comObject MOM.ScriptAPI

$error.Clear();

$oBag = $momAPI.CreatePropertyBag();



$colItems = gcim Win32_OperatingSystem;



foreach($objItem in $colItems){

	if($objItem.TotalVisibleMemorySize -gt 0){

		$performanceUtilization = (($objItem.TotalVisibleMemorySize - $objItem.FreePhysicalMemory)/$objItem.TotalVisibleMemorySize)*100;

	}

}



if($performanceUtilization -lt 0){

	$performanceUtilization = 0;

}



$performanceUtilization = [int]$performanceUtilization;



$oBag.AddValue("Utilization",$performanceUtilization);

$oBag;</Script></ScriptBody>

    <ObjectName>win32_PerfFormattedData_Perfos_Memory</ObjectName>

    <CounterName>PercentCommittedBytesInUse</CounterName>

    <InstanceName>$Target/Host/Property[Type="Windows!Microsoft.Windows.Computer"]/NetworkName$</InstanceName>

    <Value>$Data/Property[@Name='Utilization']$</Value>

  </Configuration>

</UnitMonitor>