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Failover Clustering & Hyper-V: Planning your Highly-Available

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From Microsoft tech.ed online here’s an excellent video to help you with the Failover Clustering in Hyper-V.

This technical session will discuss Hyper-V and Failover Clustering live migration, deployment considerations, licensing, upgrades, host clustering, guest clustering, disaster recovery, multi-site clustering, System Center Virtual Machine Manager, hardware and validation. What are the pros and cons of each virtualization solution? What’s right for my customers and their scenarios? What about combining physical and virtual machines in the same cluster? This session will include a live demo of a Hyper-V Cluster deployment and live migration.



Written by IT Core

November 23, 2010 at 9:34 PM

Posted in How to..., Videos, Virtualization

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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

FREE tool remove the HP Proliant Support Pack from Virtualized Servers

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Guillermo Musumeci has written a good tool for removing HP Proliant Support Pack, this tool is a nice tool to use before p2v migrations )you must remove all driver software before you start p2v).


Download: Here

Written by IT Core

July 7, 2010 at 11:00 PM

TechEd 2010 Virtualization Sessions

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Here’s some interesting sessions for virtualization from TechEd.

Networking and Windows Server 2008 R2 Hyper-V: Deployment Considerations


Microsoft System Center Virtual Machine Manager 2008 R2: Advanced Virtualization Management

The Microsoft System Center Operations Manager Top 20 Must-Have Customizations

Microsoft System Center Operations Manager and Virtual Machine Manager: Monitoring the Service Stack

See the Largest Mission Critical Deployment of Microsoft SQL Server around the World

Check the Latest Videos from TechEd North America

Have Fun 😀

Virtual Desktop Infrastructure sessions

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Recently published videos for Virtual Desktop Infrastructure sessions.
Have a look at: TechNet Edge.

Session 1: VDI Day: Citrix & Microsoft Desktop Virtualization Strategy

In this session we will guide you through the desktop virtualization strategy and show you how Citrix and Microsoft will help you reduce the costs of Managing your virtual desktop infrastructure. We will answer questions like: “Will desktop virtualization really fit every user?”


Session 2: VDI Day: Planning and Deploying VDI with Citrix and Microsoft

In this more technical session we will drill down into the Microsoft virtualization architecture of VDI and determine what key questions need to be asked and answered around required components, networking, capacity and end user experience. In the second part of the Presentation we will drill down into the Citrix components of our joint VDI solution. You will learn what the different key components are and how to setup your own test environment.

Session 3: VDI Day: Planning and Deploying VDI with Citrix and Microsoft

In the second part of the Presentation we will drill down into the Citrix components of our joint VDI solution. You will learn what the different key components are, what they add on top of the Virtualization back-end. By then end of this session you will be geared up with the knowledge to setup your own test environment.


Written by IT Core

June 14, 2010 at 11:05 PM

SCVMM Error: The server encountered an error while creating “Name of the VM”

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Robert Vierthaler that works at Microsoft as an Escalation Engineer posted about an interesting error that you might run into.
The Details:

On a Hyper-V Server, existing VMs where running just fine, however, we could not create new VMs. The error at the final stage of the Wizard was:
The server encountered an error while creating “Name of the VM”
The operation failed
Failed to create external configuration store at
: A required privilege is not held by the client. (Virtual machine ID 0x80070522)

As it turned out, the Virtual Machine Management Server was not able to create a symbolic link for the machine at “%systemdrive%\programdata\Microsoft\Windows\Hyper-V\Virtual Machines”

By default the local User Right “Create Symbolic links” is assigned to the Adminstrators group. Once you install Hyper-V a extension is installed on this machine that allows Service SIDs to be used and the Service SID “Virtual Machines” is allowed to “Create Symbolic links”

Now, you might have the requirement to configure the User Right “Create Symbolic links” with a Domain GPO. Once configured it replaces the local assignment, and for Hyper-V Hosts you’d need to add the “Virtual Machines” Service SID. The Domain Controller is most likely not a Hyper-V Host, and does not have the necessary Hyper-V extension. Also the GPO Admin tools will not allow you to browse the Service SID namespace. Simply adding the string “Virtual Machines” does not help either as it needs to have the Hyper-V Service SID Prefix “NT VIRTUAL MACHINES”.

To get the necessary Service SID added, you need to edit the GptTmpl.inf that is associated with the GPO on the Sysvol directly. [You need to locate the correct GptTmp.inf by the GPO’s Unique ID]

Example with Administrators and added “Virtual Machines”
[Privilege Rights]
SeCreateSymbolicLinkPrivilege = *S-1-5-32-544, NT Virtual Machine\Virtual Machines

Written by IT Core

June 8, 2010 at 10:07 PM