Home
  •  

Free Memory (UCD SNMP)

System.NetworkManagement.UCD_SNMP.Memory.InsufficientFreeMemory (UnitMonitor)

Monitors the amount of free memory on the network device

Knowledge Base article:

Summary

The monitor indicates the level of free memory on this device. This monitor has two possible states:

Configuration

The following options can be configured on this monitor:

Option

Definition

Default

Interval

Amount of time in seconds between checks of the device status

240 seconds

Number of retries

Number of attempts in each monitoring interval before the interval's sample is discarded

3

Number of samples

Number of consecutive samples before the monitor changes state

3

Timeout

Amount of time in milliseconds to wait for a response from the device before the sample times out and a new attempt is made to sample the value

3,500 milliseconds

Threshold

Percentage of free memory remaining

15

Causes

This monitor enters an error state when the amount of free memory on the interface is less than the configured threshold. The default is 15%

Resolutions

Use the Health Explorer to check the details for the state change on the State Change Events tab for the monitor. This data shows the calculated performance counter value that caused the health state change. Consult the device manufacturer's documentation for more information on the problem and troubleshooting procedures.

Element properties:

TargetSystem.NetworkManagement.UCD_SNMP_Performance_Memory
Parent MonitorSystem.Health.PerformanceState
CategoryPerformanceHealth
EnabledTrue
Alert GenerateTrue
Alert SeverityMatchMonitorHealth
Alert PriorityNormal
Alert Auto ResolveTrue
Monitor TypeSystem.NetworkManagement.ComputedLowThresholdMonitorType.Division
RemotableTrue
AccessibilityPublic
Alert Message
Free Memory Alert
The amount of free memory on {0} is below the threshold. Free memory is at {1}\%.
RunAsDefault

Source Code:

<UnitMonitor ID="System.NetworkManagement.UCD_SNMP.Memory.InsufficientFreeMemory" Accessibility="Public" Enabled="true" Target="NetworkLibrary!System.NetworkManagement.UCD_SNMP_Performance_Memory" ParentMonitorID="SystemHealth!System.Health.PerformanceState" Remotable="true" Priority="Normal" TypeID="System.NetworkManagement.ComputedLowThresholdMonitorType.Division" ConfirmDelivery="false">

  <Category>PerformanceHealth</Category>

  <AlertSettings AlertMessage="System.NetworkManagement.Generic.Memory.InsufficientFreeMemory.AlertMessage">

    <AlertOnState>Error</AlertOnState>

    <AutoResolve>true</AutoResolve>

    <AlertPriority>Normal</AlertPriority>

    <AlertSeverity>MatchMonitorHealth</AlertSeverity>

    <AlertParameters>

      <AlertParameter1>$Target/Host/Property[Type="System!System.Entity"]/DisplayName$</AlertParameter1>

      <AlertParameter2>$Data/Context/Value$</AlertParameter2>

    </AlertParameters>

  </AlertSettings>

  <OperationalStates>

    <OperationalState ID="UnderThreshold" MonitorTypeStateID="MTSThresholdError" HealthState="Error"/>

    <OperationalState ID="OverThreshold" MonitorTypeStateID="MTSThresholdSuccess" HealthState="Success"/>

  </OperationalStates>

  <Configuration>

    <Interval>300</Interval>

    <NoOfRetries>3</NoOfRetries>

    <Timeout>3500</Timeout>

    <SnmpVarBinds>

      <SnmpVarBind>

        <OID>.1.3.6.1.4.1.2021.4.5.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.LogicalDevice"]/Index$</OID>

        <Syntax>0</Syntax>

        <Value VariantType="8"/>

      </SnmpVarBind>

      <SnmpVarBind>

        <OID>.1.3.6.1.4.1.2021.4.6.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.LogicalDevice"]/Index$</OID>

        <Syntax>0</Syntax>

        <Value VariantType="8"/>

      </SnmpVarBind>

    </SnmpVarBinds>

    <Numerator>

      <Product>

        <NumericValue>

          <XPathQuery Type="Double">SnmpVarBinds/SnmpVarBind[OID=".1.3.6.1.4.1.2021.4.6.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.LogicalDevice"]/Index$"]/Value</XPathQuery>

        </NumericValue>

        <NumericValue>

          <Value>100.0</Value>

        </NumericValue>

      </Product>

    </Numerator>

    <Denominator>

      <XPathQuery Type="Double">SnmpVarBinds/SnmpVarBind[OID=".1.3.6.1.4.1.2021.4.5.$Target/Property[Type="NetworkLibrary!System.NetworkManagement.LogicalDevice"]/Index$"]/Value</XPathQuery>

    </Denominator>

    <DefaultValue>0.0</DefaultValue>

    <Threshold>15</Threshold>

    <NumberOfSamples>3</NumberOfSamples>

    <ObjectName>Memory</ObjectName>

    <CounterName>Free Memory %</CounterName>

  </Configuration>

</UnitMonitor>