You can check to see if the root/cimv2 namespace is populated by doing the following:
/var/lib/Pegasus/repository/root#cimv2/classes
You should see a number of classes there. CIM_SystemComponent should be
present there as well.
I checked by Pegasus installation root/cimv2 is populated and CIM_SystemComponent class is also present. Here is the output. # ls /var/lib/Pegasus/repository/root#cimv2/classes |grep CIM_SystemComponent CIM_AccountOnSystem.CIM_SystemComponent CIM_ApplicationSystemSoftwareFeature.CIM_SystemComponent CIM_ASBGPEndpoints.CIM_SystemComponent CIM_ComponentCS.CIM_SystemComponent CIM_Confederation.CIM_SystemComponent CIM_ContainedDomain.CIM_SystemComponent CIM_FilterEntryInSystem.CIM_SystemComponent CIM_FilterListInSystem.CIM_SystemComponent CIM_HostedFileSystem.CIM_SystemComponent CIM_HostedStoragePool.CIM_SystemComponent CIM_InstalledOS.CIM_SystemComponent CIM_J2eeApplicationModule.CIM_SystemComponent CIM_J2eeServerInDomain.CIM_SystemComponent CIM_PolicyContainerInPolicyContainer.CIM_SystemComponent CIM_PolicyRepositoryInPolicyRepository.CIM_SystemComponent CIM_ResourceOfSystem.CIM_SystemComponent CIM_RoutersInAS.CIM_SystemComponent CIM_SystemBIOS.CIM_SystemComponent CIM_SystemComponent.CIM_Component CIM_SystemDevice.CIM_SystemComponent # I dont see CIM_HostedResourcePool in root/cimv2. But do see it in root/virt namespace. # ls /var/lib/Pegasus/repository/root#virt/classes |grep CIM_SystemComponent CIM_AccountOnSystem.CIM_SystemComponent CIM_ApplicationSystemSoftwareFeature.CIM_SystemComponent CIM_ASBGPEndpoints.CIM_SystemComponent CIM_ComponentCS.CIM_SystemComponent CIM_Confederation.CIM_SystemComponent CIM_ContainedDomain.CIM_SystemComponent CIM_FilterEntryInSystem.CIM_SystemComponent CIM_FilterListInSystem.CIM_SystemComponent CIM_HostedFileSystem.CIM_SystemComponent CIM_HostedResourcePool.CIM_SystemComponent CIM_InstalledOS.CIM_SystemComponent CIM_J2eeApplicationModule.CIM_SystemComponent CIM_J2eeServerInDomain.CIM_SystemComponent CIM_PolicyContainerInPolicyContainer.CIM_SystemComponent CIM_PolicyRepositoryInPolicyRepository.CIM_SystemComponent CIM_ResourceOfSystem.CIM_SystemComponent CIM_RoutersInAS.CIM_SystemComponent CIM_SystemBIOS.CIM_SystemComponent CIM_SystemComponent.CIM_Component CIM_SystemDevice.CIM_SystemComponent # Thanks Gopal