Inconsistent output from SCVMM PowerShell commands

I noticed that the output from SCVMM commands is not consistent. I will use an example: When I run the command Get-SCVMHostGroup for the first time, the Hosts and AllChildHosts properties are null, but if I keep running the same command continuously
the values slowly start appearing. See following output:
PS C:\Users\mandardi> Get-SCVMHostGroup
AllChildGroups : {}
AllChildHosts : {}
AllowUnencryptedTransfers : False
ChildGroups : {}
CreationDate : 8/16/2011 7:32:06 PM
Creator :
Description :
Hosts : {}
ID : 0e3ba228-a059-46be-aa41-2f5cf0f4b96e
InheritPROSettings :
InheritNetworkSettings : False
IsFullyCached : True
IsRoot : True
MarkedForDeletion : False
ModificationDate : 8/16/2011 7:32:06 PM
ModifiedBy :
Name : All Hosts
ParentHostGroup :
Path : All Hosts
PROAutomationLevel :
PROMonitoringLevel :
ServerConnection : Microsoft.SystemCenter.VirtualMachineManager.Remoting.ServerConnection
PS C:\Users\mandardi> Get-SCVMHostGroup
AllChildGroups : {}
AllChildHosts : {mandar-win2k8.cvlxxxxx.local}
AllowUnencryptedTransfers : False
ChildGroups : {}
CreationDate : 8/16/2011 7:32:06 PM
Creator :
Description :
Hosts : {mandar-win2k8.cvlxxxxx.local}
ID : 0e3ba228-a059-46be-aa41-2f5cf0f4b96e
InheritPROSettings :
InheritNetworkSettings : False
IsFullyCached : True
IsRoot : True
MarkedForDeletion : False
ModificationDate : 8/16/2011 7:32:06 PM
ModifiedBy :
Name : All Hosts
ParentHostGroup :
Path : All Hosts
PROAutomationLevel :
PROMonitoringLevel :
ServerConnection : Microsoft.SystemCenter.VirtualMachineManager.Remoting.ServerConnection
The command above was run twice within an interval of few seconds, as you can see the Hosts/AllChildHosts properties are populated after the second attempt.
I want to know what is the reason for this behavior, are the properties collected asynchronously? If yes, what is the best way to prevent this?
I also noticed that when you open a new powershell window, the same behavior repeats, in fact you get correct output in one window, whereas you get null values in other. What is the reason for this and what's the work around?
Thanks in advance.
Mandar

There are times when you get a job back as the return value and not the actual queried value.
Quite frequently it has to do with the information being queried.
Getting a specific HostGroup I would expect to be relatively quick, however generically querying for all host groups might not.
I have not tried the specific scenario myself, I am describing behavior i have experienced.
Does this affect the reliability of the PoSh module? I don't think so. But it definately affects how you use it and its cmdlets.
I have learned that taking thinking from another virutalization environment (XenServer or vCenter for example) and expecting those same behaviors from SCVMM is a false assumption that many folks run in to. This makes VMM neither fit nor unfit - just
different.
I am not attempting to defend VMM, just stating situations that I have been in with development teams.
Brian Ehlert (hopefully you have found this useful) http://ITProctology.blogspot.com
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