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ICache Byte hit ratio(Percentage)

Citrix.NetScaler.NetscalerDevice.ICacheBytehitratio.PerformanceCounter (Rule)

Cache byte hit ratio expressed as percentage. Here we define byte hit ratio as ((number of bytes served from the cache)/(total number of bytes served to the client)). This is the standard definition of Byte Hit Ratio. If compression is turned ON in NS then this ratio doesn't mean much. This might under or over estimate the origin-to-cache bandwidth saving (depending upon whether bytes served by CMP in NetScaler are more or less than compressed bytes served from the cache). If CMP is turned OFF in NS then this ratio is same as cachePercentOriginBandwidthSaved.

Knowledge Base article:

Summary

Cache byte hit ratio expressed as percentage. Here we define byte hit ratio as ((number of bytes served from the cache)/(total number of bytes served to the client)). This is the standard definition of Byte Hit Ratio. If compression is turned ON in NS then this ratio doesn't mean much. This might under or over estimate the origin-to-cache bandwidth saving (depending upon whether bytes served by CMP in NetScaler are more or less than compressed bytes served from the cache). If CMP is turned OFF in NS then this ratio is same as cachePercentOriginBandwidthSaved.

Resolutions

TODO

Element properties:

TargetCitrix.NetScaler.NetscalerDevice
CategoryPerformanceHealth
EnabledFalse
Alert GenerateFalse
RemotableTrue

Member Modules:

ID Module Type TypeId RunAs 
DS DataSource Citrix.NetScaler.NetscalerDevice.SnmpPerformanceProvider Default
WriteToDB WriteAction Microsoft.SystemCenter.CollectPerformanceData Default
WriteToDW WriteAction Microsoft.SystemCenter.DataWarehouse.PublishPerformanceData Default

Source Code:

<Rule ID="Citrix.NetScaler.NetscalerDevice.ICacheBytehitratio.PerformanceCounter" Enabled="false" Target="Citrix.NetScaler.NetscalerDevice" ConfirmDelivery="false" Remotable="true" Priority="Normal" DiscardLevel="100">

  <Category>PerformanceHealth</Category>

  <DataSources>

    <DataSource ID="DS" TypeID="Citrix.NetScaler.NetscalerDevice.SnmpPerformanceProvider">

      <Interval>300</Interval>

      <IsWriteAction>true</IsWriteAction>

      <IP>$Target/Property[Type="NetworkLibrary!System.NetworkManagement.Node"]/SNMPAddress$</IP>

      <CommunityString>$RunAs[Name="NetworkLibrary!System.NetworkManagement.Snmp.MonitoringAccount"]/CommunityString$</CommunityString>

      <SnmpVarBinds>

        <SnmpVarBind>

          <OID>.1.3.6.1.4.1.5951.4.1.1.49.40.0</OID>

          <Syntax>0</Syntax>

          <Value VariantType="8"/>

        </SnmpVarBind>

      </SnmpVarBinds>

      <ObjectName>ICacheBytehitratio</ObjectName>

      <CounterName>$data/SnmpVarBinds/SnmpVarBind[1]/OID$</CounterName>

      <InstanceName>0</InstanceName>

      <Value>$data/SnmpVarBinds/SnmpVarBind[1]/Value$</Value>

    </DataSource>

  </DataSources>

  <WriteActions>

    <WriteAction ID="WriteToDB" TypeID="SystemCenter!Microsoft.SystemCenter.CollectPerformanceData"/>

    <WriteAction ID="WriteToDW" TypeID="SCDW!Microsoft.SystemCenter.DataWarehouse.PublishPerformanceData"/>

  </WriteActions>

</Rule>