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Archive for September 2010

Windows Storage Server 2008 R2 and the Microsoft iSCSI Software Target 3.3 available on MSDN/TechNet

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Microsoft has released the Windows Storage Server 2008 R2 for MSDN/TechNet subscribers this new version includes Microsoft iSCSI Software Target 3.3 that includes Windows PowerShell cmdlets and differencing virtual hard disk support for HPC boot scenarios.


Read more at:
Windows Storage Server
Jose Barreto’s Blog
PowerShell cmdlets for the Microsoft iSCSI Target 3.3 (included in Windows Storage Server 2008 R2)


Written by IT Core

September 29, 2010 at 9:08 PM

Virtual Machine Servicing Tool (VMST) 3.0

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This release of the Virtual Machine Servicing Tool (VMST) 3.0 completely replaces the Offline Virtual Machine Servicing Tool version 2.1.

Version 3.0 of the tool works with System Center Virtual Machine Manager 2008 R2, System Center Configuration Manager 2007 SP2, and Windows Server Update Services 3.0 SP2. The tool also supports updating the Windows® 7 and Windows Server® 2008 R2 operating systems.

To Download the Virtual Machine Servicing Tool 3.0 click here.

Some highlights include:
•    Offline virtual machines in a SCVMM library.
•    Stopped and saved state virtual machines on a host.
•    Virtual machine templates.
•    Offline virtual hard disks in a SCVMM library by injecting update packages.

Written by IT Core

September 28, 2010 at 12:00 AM

KB2413735: Mouse and screen resolution issues when managing a virtual machine using the Hyper-V

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From KB2413735

Windows Server 2008 or Windows Server 2008 R2, you may experience one of the following symptoms when you connect to a Hyper-V virtual machine using the Hyper-V Manager console or the System Center Virtual Machine Manager Administrator Console:
· The mouse cursor is frozen or has disappeared
· The screen resolution has reverted to the default size
If you connect to the virtual machine using a Remote Desktop Connection (RDP), the symptoms listed above are not exhibited.

This issue can occur after a new Hyper-V VMMS certificate is generated.
Note: The following event will be logged in the Hyper-VMMS event log when a new VMMS certificate is generated:

Log Name: Microsoft-Windows-Hyper-V-VMMS-Admin
Source: Microsoft-Windows-Hyper-V-VMMS
Event ID: 12520
Level: Warning
Auto-generating a self-signed certificate for server authentication.

To resolve this issue, perform one of the following steps on the Hyper-V server:
·Place the virtual machines in a saved state and then resume the virtual machines.
·Restart the virtual machines.

The self-signed certificate that is generated by the Hyper-V Virtual Machine Management service is valid for one year.

To create a self-signed certificate that doesn’t expire for several years, perform the following steps:
Copy the PowerShell script from the following Microsoft Web site: (
2. Paste the script into notepad, and then save the file as Cert.ps1. 
3. Copy Makecert.exe to the same directory as the Cert.ps1 file.
For more information on how to obtain Makecert.exe, please visit the following Microsoft web site: (
4. Open an elevated Windows PowerShell command prompt. 
5. Run the Cert.ps1 script.


Written by IT Core

September 23, 2010 at 12:14 PM

KB2308590: System Center Virtual Machine Manager 2008 R2 hotfix rollup package

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KB2308590: System Center Virtual Machine Manager 2008 R2 hotfix rollup package

List of issues that are resolved
Issue 1
Duplicate virtual machines (VMs) may appear in the SCVMM Administrator Console window after a Hyper-V VM in a cluster fails over to another cluster node. Additionally, the status for one of the duplicate VMs is set to Missing. If you try to remove the missing VM from the SCVMM Administrator Console window, the VM is not removed.
Issue 2
Consider the following scenario:
You install the Hyper-V role on a computer that is running Windows Server 2008 R2.
You configure the computer to start from a virtual hard disk.
The computer is part of a Hyper-V failover cluster. The cluster is configured to use cluster shared volumes.
You try to create a VM on a cluster shared volume by using SCVMM 2008 R2.
In this scenario, the operation fails together with the 2912 (0x8004232C) error code.
Issue 3
The Virtual Machine Manager service (Vmmservice.exe) crashes if the following conditions are true:

System Center Operations Manager 2007 integration is enabled.
A Performance and Resource Optimization (PRO) feature-enabled management pack is imported into Operations Manager.
The PRO settings for a host group are changed on the SCVMM server.

KB2308590: System Center Virtual Machine Manager 2008 R2 hotfix rollup package

Written by IT Core

September 21, 2010 at 10:11 PM

Hyper-V R2 Cluster CSV stops working when NTLM is disabled in cluster with Hyper-V Enabled

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Hyper-V R2 Cluster CSV stops working when NTLM is disabled in cluster with Hyper-V Enabled

ID: 5121
Source: Microsoft-Windows-FailoverClustering
Version: 6.1
Message: Cluster Shared Volume ‘%1′ (’%2′) is no longer directly accessible from this cluster node

This error may be caused because the NTLM was disabled in your Hyper-Host. Enabling a policy to disable NTLM may break CSV and cause the alert described before.

If the NTLM was disabled using GPO in your Active Directory Domain, identify the GPO with this setting and create an exception to this policy for all clustered Hyper-V computer objects. Alternatively you can create and link another GPO (GPO with “enable NTLM” setting) that applies just to the clustered hosts. 


Written by IT Core

September 21, 2010 at 10:07 PM

Hyper-V Host may stop when VM’s Dynamic Memory use all available RAM

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When setting up VMs with dynamic memory remember that your hyper-v host may stop if those VMs consume (or try to) use all existing memory on the host leaving nothing for the parent partition. 

To prevent that Crete the following Registry Key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ Virtualization
Name = MemoryReserve
Setting = amount of MB to reserve for the parent partition.
After setting up the desired value you must reboot the host to the setting become active.

Note: if you set this value too low; VMs will be able to use too much memory and cause performance issues for you. Equally – the higher you set this the fewer VMs you can run.
For more information about memory reserve with dynamic memory check the Virtual PC Guy’s Blog

Written by IT Core

September 21, 2010 at 9:52 PM

How to manually remove a missing host from SCVMM

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You may see the following error when trying to remove a “dead” host from your SCVMM console.

Error (406)
Access has been denied while contacting the server <servername>. 

Recommended Action
1. Verify that the specified user account has administrative privileges on <servername>.
2. Verify that DCOM access, launch, and activation permissions are enabled on <servername> for the Administrators group. Use dcomcnfg.exe to modify permissions, and then try the operation again.

If that server is no longer online you need a way to remove it from your SCVMM. To do that you may use the PowerShell that come with the SCVMM console:

get-vmmserver <Vmm_Server_Name>
Than forcibly remove the missing host server by running:
remove-vmhost <Host_Server_Name> –force
Wait a few seconds and the host should be removed from the console.


Written by IT Core

September 21, 2010 at 8:49 PM