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Third Level host discovery is not working

Question

Hi,

I have 3 discovery classes A-(hosts)->B-(Hosts)->C.

Class A targets windows Computer

Class B targets A

Class C Targets B

I can see A and B discovered and associated to each other in OpsManager but class C is not discovered. The discovery is done using PowerShell scripts and I can see the scripts running on the client machines.

There are no errors in PowerShell and OpsManager logs.

 <TypeDefinitions>
  <EntityTypes>
   <ClassTypes>
    <ClassType ID="Hierarchy.Class.A" Accessibility="Public" Abstract="false" Base="System!System.LogicalEntity" Hosted="false" Singleton="false">
     <Property ID="A" Type="string" Key="true" CaseSensitive="false" Length="256" MinLength="0" />
    </ClassType>
    <ClassType ID="Hierarchy.Class.B" Accessibility="Public" Abstract="false" Base="System!System.LogicalEntity" Hosted="true" Singleton="false">
     <Property ID="B" Type="string" Key="true" CaseSensitive="false" Length="256" MinLength="0" />
    </ClassType>
    <ClassType ID="Hierarchy.Class.C" Accessibility="Public" Abstract="false" Base="System!System.LogicalEntity" Hosted="true" Singleton="false">
     <Property ID="C" Type="string" Key="true" CaseSensitive="false" Length="256" MinLength="0" />
    </ClassType>
   </ClassTypes>
   <RelationshipTypes>
    <RelationshipType ID="Hierarchy.Relationship.AHostsB" Accessibility="Public" Abstract="false" Base="System!System.Hosting">
     <Source>Hierarchy.Class.A</Source>
     <Target>Hierarchy.Class.B</Target>
    </RelationshipType>
    <RelationshipType ID="Hierarchy.Relationship.BHostsC" Accessibility="Public" Abstract="false" Base="System!System.Hosting">
     <Source>Hierarchy.Class.B</Source>
     <Target>Hierarchy.Class.C</Target>
    </RelationshipType>
   </RelationshipTypes>
  </EntityTypes>
 </TypeDefinitions>
 <Monitoring>
  <Discoveries>
   <Discovery ID="Hierarchy.Discovery.A" Enabled="true" Target="Windows!Microsoft.Windows.Computer" ConfirmDelivery="true" Remotable="true" Priority="Normal">
    <Category>Discovery</Category>
    <DiscoveryTypes>
     <DiscoveryClass TypeID="Hierarchy.Class.A">
      <Property TypeID="Hierarchy.Class.A" PropertyID="A" />
      <Property TypeID="System!System.Entity" PropertyID="DisplayName" />
     </DiscoveryClass>
     <DiscoveryRelationship TypeID="SC!Microsoft.SystemCenter.HealthServiceShouldManageEntity" />
     <DiscoveryRelationship TypeID="Hierarchy.Relationship.AHostsB" />
    </DiscoveryTypes>
    <DataSource ID="PSDiscoveryA" TypeID="System!System.CommandExecuterDiscoveryDataSource">
     <IntervalSeconds>180</IntervalSeconds>
     <ApplicationName><![CDATA[%windir%\system32\windowspowershell\v1.0\powershell.exe]]></ApplicationName>
     <WorkingDirectory />
     <CommandLine>.\ADiscovery.ps1</CommandLine>
     <TimeoutSeconds>170</TimeoutSeconds>
     <RequireOutput>true</RequireOutput>
     <Files>
      <File>
       <Name>ADiscovery.ps1</Name>
       <Contents><![CDATA[
		$SourceId = "$MPElement$"
		$ManagedEntityId = "$Target/Id$"
		$PrincipalName = "$Target/Property[Type="Windows!Microsoft.Windows.Computer"]/PrincipalName$"
		
		Set-ExecutionPolicy Unrestricted
		$snapIns = Get-PSSnapin
		
		$api = New-Object -ComObject 'MOM.ScriptAPI'
		$oDiscoveryData = $api.CreateDiscoveryData(0, $SourceId, $ManagedEntityId)

		$EventLog = new-object System.Diagnostics.EventLog('Application')
		$EventLog.MachineName = "."
		$EventLog.Source = "A"
		$EventLog.WriteEntry("A Starting ... $PrincipalName")
		$error.clear()

		$DateTime = [System.DateTime]::Now
		$Millisecond = $DateTime.Millisecond
		$Time = "$DateTime$Millisecond"
		$CurrentTime = $Time.ToString()
		
		$Inst = $oDiscoveryData.CreateClassInstance("$MPElement[Name='Hierarchy.Class.A']$")
		$Inst.AddProperty("$MPElement[Name='Hierarchy.Class.A']/A$", "A on $PrincipalName")
		$Inst.AddProperty("$MPElement[Name='System!System.Entity']/DisplayName$", "$PrincipalName")
		$oDiscoveryData.AddInstance($Inst)
				
		$oHealthServiceInstance = $oDiscoveryData.CreateClassInstance("$MPElement[Name='SC!Microsoft.SystemCenter.HealthService']$")
		$oHealthServiceInstance.AddProperty("$MPElement[Name='Windows!Microsoft.Windows.Computer']/PrincipalName$",$PrincipalName )
		$oRel = $oDiscoveryData.CreateRelationshipInstance("$MPElement[Name='SC!Microsoft.SystemCenter.HealthServiceShouldManageEntity']$")
		$oRel.Source = $oHealthServiceInstance
		$oRel.Target = $Inst
		$oDiscoveryData.AddInstance($oRel)

		$EventLog.WriteEntry("A Ending ... : $error")
		$api.Return($oDiscoveryData)
    
    ]]></Contents>
      </File>
     </Files>
    </DataSource>
   </Discovery>
   <Discovery ID="Hierarchy.Discovery.B" Enabled="true" Target="Hierarchy.Class.A" ConfirmDelivery="true" Remotable="true" Priority="Normal">
    <Category>Discovery</Category>
    <DiscoveryTypes>
     <DiscoveryClass TypeID="Hierarchy.Class.B">
      <Property TypeID="Hierarchy.Class.B" PropertyID="B" />
      <Property TypeID="System!System.Entity" PropertyID="DisplayName" />
     </DiscoveryClass>
     <DiscoveryRelationship TypeID="Hierarchy.Relationship.BHostsC" />
    </DiscoveryTypes>
    <DataSource ID="PSDiscoveryB" TypeID="System!System.CommandExecuterDiscoveryDataSource">
     <IntervalSeconds>150</IntervalSeconds>
     <ApplicationName><![CDATA[%windir%\system32\windowspowershell\v1.0\powershell.exe]]></ApplicationName>
     <WorkingDirectory />
     <CommandLine>.\BDiscovery.ps1</CommandLine>
     <TimeoutSeconds>140</TimeoutSeconds>
     <RequireOutput>true</RequireOutput>
     <Files>
      <File>
       <Name>BDiscovery.ps1</Name>
       <Contents><![CDATA[
		$SourceId = "$MPElement$"
		$ManagedEntityId = "$Target/Id$"
		$A = "$Target/Property[Type="Hierarchy.Class.A"]/A$"
		
		Set-ExecutionPolicy Unrestricted
		$snapIns = Get-PSSnapin
		
		$api = New-Object -ComObject 'MOM.ScriptAPI'
		$oDiscoveryData = $api.CreateDiscoveryData(0, $SourceId, $ManagedEntityId)

		$Inst = $oDiscoveryData.CreateClassInstance("$MPElement[Name='Hierarchy.Class.B']$")
		$Inst.AddProperty("$MPElement[Name='Hierarchy.Class.B']/B$", "AB on $A")
		$Inst.AddProperty("$MPElement[Name='System!System.Entity']/DisplayName$", "AB")
		$Inst.AddProperty("$MPElement[Name='Hierarchy.Class.A']/A$", $A)
		$oDiscoveryData.AddInstance($Inst)

		$api.Return($oDiscoveryData)
    
    ]]></Contents>
      </File>
     </Files>
    </DataSource>
   </Discovery>
   <Discovery ID="Hierarchy.Discovery.C" Enabled="true" Target="Hierarchy.Class.B" ConfirmDelivery="true" Remotable="true" Priority="Normal">
    <Category>Discovery</Category>
    <DiscoveryTypes>
     <DiscoveryClass TypeID="Hierarchy.Class.C">
      <Property TypeID="Hierarchy.Class.C" PropertyID="C" />
      <Property TypeID="System!System.Entity" PropertyID="DisplayName" />
     </DiscoveryClass>
    </DiscoveryTypes>
    <DataSource ID="PSDiscoveryC" TypeID="System!System.CommandExecuterDiscoveryDataSource">
     <IntervalSeconds>120</IntervalSeconds>
     <ApplicationName><![CDATA[%windir%\system32\windowspowershell\v1.0\powershell.exe]]></ApplicationName>
     <WorkingDirectory />
     <CommandLine>.\CDiscovery.ps1</CommandLine>
     <TimeoutSeconds>110</TimeoutSeconds>
     <RequireOutput>true</RequireOutput>
     <Files>
      <File>
       <Name>CDiscovery.ps1</Name>
       <Contents><![CDATA[
		$SourceId = "$MPElement$"
		$ManagedEntityId = "$Target/Id$"
		$B = "$Target/Property[Type="Hierarchy.Class.B"]/B$"
		
		Set-ExecutionPolicy Unrestricted
		$snapIns = Get-PSSnapin
		
		$api = New-Object -ComObject 'MOM.ScriptAPI'
		$oDiscoveryData = $api.CreateDiscoveryData(0, $SourceId, $ManagedEntityId)
		
		$Inst = $oDiscoveryData.CreateClassInstance("$MPElement[Name='Hierarchy.Class.C']$")
		$Inst.AddProperty("$MPElement[Name='Hierarchy.Class.C']/C$", "ABC on $B")
		$Inst.AddProperty("$MPElement[Name='System!System.Entity']/DisplayName$", "ABC")
		$Inst.AddProperty("$MPElement[Name='Hierarchy.Class.B']/B$", $B)
		$oDiscoveryData.AddInstance($Inst)
		$api.Return($oDiscoveryData)
    
    ]]></Contents>
      </File>
     </Files>
    </DataSource>
   </Discovery>
  </Discoveries>
 </Monitoring>
 <LanguagePacks>
  <LanguagePack ID="ENG" IsDefault="false">
   <DisplayStrings>
    <DisplayString ElementID="Hierarchy">
     <Name>Hierarchy</Name>
     <Description> Simple Hierarchy Check</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Class.A">
     <Name>A</Name>
     <Description>This is Class A</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Class.B">
     <Name>B</Name>
     <Description>This is class B</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Class.B" SubElementID="B">
     <Name>B</Name>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Discovery.A">
     <Name>A</Name>
     <Description>Test Class A </Description>
    </DisplayString>
   </DisplayStrings>
  </LanguagePack>
  <LanguagePack ID="ENU" IsDefault="true">
   <DisplayStrings>
    <DisplayString ElementID="Hierarchy">
     <Name>Hierarchy</Name>
     <Description> Simple Hierarchy Check</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Class.A">
     <Name>A</Name>
     <Description>This is Class A</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Class.B">
     <Name>B</Name>
     <Description>This is class B</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Class.B" SubElementID="B">
     <Name>B</Name>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Class.C">
     <Name>C</Name>
     <Description>Test Class C</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Discovery.A">
     <Name>A</Name>
     <Description />
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Discovery.B">
     <Name>B</Name>
     <Description>Test Descovery Class B</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Discovery.C">
     <Name>C</Name>
     <Description>Test Discovery Class C</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Relationship.AHostsB">
     <Name>AHostsB</Name>
     <Description>AHostsB</Description>
    </DisplayString>
    <DisplayString ElementID="Hierarchy.Relationship.BHostsC">
     <Name>BHostsC</Name>
     <Description>BHostsC</Description>
    </DisplayString>
   </DisplayStrings>
  </LanguagePack>
 </LanguagePacks>
</ManagementPack>

Thursday, May 19, 2011 7:34 AM

Answers

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Couple of issues. You can eliminate the "agent should manage" logic from all of your discoveries as this is not needed and will not change your results.

your C discovery will not function as coded because you did not specifiy the full key up to A. You need to add the A property to C discovery to get the right pair of AB to be selected. To get the $A value in this case, you have to use $A = "$Target/Host/Host/Property[Type='Hierarchy.Class.A']/A$" and then add the line

$Inst.AddProperty("$MPElement[Name='Hierarchy.Class.A']/A$", $A)

To your C discovery to get it to work.

Microsoft Corporation
- Marked as answer by Yog Li Friday, May 27, 2011 8:59 AM
Thursday, May 19, 2011 8:31 PM

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Third Level host discovery is not working

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