Archive for March, 2012

Understanding SR-IOV in Hyper-V

March 27, 2012 1 comment
Categories: Virtualization Tags: , ,

Windows 2008R2 – Hyper-V / Cluster. Post SP1 patches

Here is the list of required and optional post Windows 2008R2 SP1 hotfixes.

Please keep in mind that it all depends on which hardware and software combinations are used:

Note:  Windows Server 2008 R2 SP1 should be installed at a minimum plus the required hotfixes.

1              Windows & Hyper-V : Required Hotfixes

Validate SCSI Device Vital Product Data (VPD) test fails after you install Windows Server 2008 R2 SP1 for 3+ node Hyper-V clusters)

The network connection of a running Hyper-V virtual machine may be lost under heavy outgoing network traffic on a computer that is running Windows Server 2008 R2 SP1

The Cluster service stops unexpectedly on a Windows Server 2008 R2 failover cluster node when you perform multiple backup operations in parallel on a cluster shared volume for Veeam backup software)

MPIO failover fails on a computer that is running Windows Server 2008 R2

The MPIO driver fails over all paths incorrectly when a transient single failure occurs in Windows Server 2008 or in Windows Server 2008 R2

Performance decreases in Windows Server 2008 R2 when the Hyper-V role is installed on a computer that uses Intel Westmere or Sandy Bridge processors (for example :  Intel Xeon 5600 series processors )

Stop error 0x0000007a occurs on a virtual machine that is running on a Windows Server 2008 R2-based failover cluster with a cluster shared volume, and the state of the CSV is switched to redirected access. (required for Veeam backup software)

Optional Hotfixes

An update is available for Hyper-V Best Practices Analyzer for Windows Server 2008 R2

“0x0000009E” Stop error when you add an extra storage disk to a failover cluster in Windows Server 2008 R2

A virtual machine online backup fails in Windows Server 2008 R2 when the SAN policy is set to “Offline All”

Cluster node cannot rejoin the cluster after the node is restarted or removed from the cluster in Windows Server 2008 R2

Cluster service stops when an error occurs in the registry replication process of a failover cluster in Windows Server 2008 R2 or in Windows Server 2008

“0x20001” Stop error when you start a Linux VM in Windows Server 2008 R2 SP1

A heap memory leak occurs when an application or service queries the MSCluster_Resource WMI class in Windows Server 2008 R2

Cluster service initiates a failover after a delay of about 80 seconds when you shutdown the active node in Windows Server 2008 R2

New registration entries are added to the Persistent Reservation table when the physical disk resource that is associated with the CSV is taken offline on a Windows Server 2008 R2-based Failover Cluster

A transient communication failure causes a Windows Server 2008 R2 failover cluster to stop working

Cluster service leaks memory when the service handles state change notifications in Windows Server 2008 R2 or Windows Server 2008

Hyper-V Export function consumes all available memory in Windows Server 2008 or in Windows Server 2008 R2

Microcode update for Intel processors in Windows 7 or in Windows Server 2008 R2

Corrupted VSS snapshot

FIX: The guest operating system may crash (STOP 0xd) when you perform a live migration of Hyper-V virtual machines in a Windows Server 2008 R2 environment


A BIG Thanks to Hans Vredevoort

How to ensure that you continuously learn and stay relevant in a transforming profession

That professionals with the right skills are able to receive higher salaries we already know. We also know that the value of a particular skill and certification depends on the demand it generates from the industry.

But how can we address this? How come we become one of the “most wanted professional”?

I would start with continously learning,  certification and then experience and then back again to study, certification… you got it!

I do believe that certification encourage students to develop the skills that are necessary and this is essential in IT. But it needs to come with experience. So get your hands on!

Microsoft Learning is addressing this need for new skills by ensuring it offers training and certifications that enable IT Pros and Developers to develop and validate their skill sets across this new range of skills with a focus on specific technology solutions. One example of this effort is the recently announced private cloud certification.

You can start today by heading over to the Microsoft Private Cloud Certification Overview page :

Categories: Virtualization

Microsoft Private Cloud Certification

Get started today by heading over to the Microsoft Private Cloud Certification Overview page. That’s where you can prepare and practice for the certification, sign up for our upcoming Private Cloud Jump Start course, and get a head start on your private cloud certification by starting your MCITP Server Administrator certification.

The traditional datacenter model is changing rapidly—and Microsoft Certification continues to change with it, to help you keep your skills relevant in the new world of the private cloud.

Windows 8 Hyper-V : Powershell script to create vm’s based on csv file

This is my first PowerShell 3.0 script to create Virtual Machine based on .csv file which contains the necessary information.

I created this script when in the Hands on Hyper-V PowerShell session at the MVP Global Summit, in Redmond.

Save the following .csv file ( I saved it on c:\vms )

OperatingSystem,MinimumMemoryMB,RecommendMemoryMB,BaseVhdPath Win7,512,1024,c:\VHD\7601.17514.101119-1850_x86fre_Enterprise_en-us_VL.vhd 2008R2,1024,2048,c:\VHD\WS2008R2_Enterprise_x64.vhd


Here is the Powershell script:


$vms=import-csv C:\vms\OperatingSystems.csv

foreach ($vm in $vms) {

#this command creates the VM with the recommend memory

New-VM -Name $vm.operatingsystem -MemoryStartupBytes $vm.RecommendedMemoryMB

# this command set’s the minimum memory for the OS

Set-Vm -Name $vm.operatingsystem -MemoryMinimumBytes $vm.MinimumMemoryMB

#how cool is the new command to extract the path and join to a new string…

$vhpath= join-path (Split-Path $vm.basevhdpath -Parent) -ChildPath ($vm.operatingsystem+’Diff.vhdx’)

#this command create a new differencing disk and attach it to a vm

New-VHD –ParentPath $vm.BaseVhdPath –Path $vhdpath -Differencing Add-VMHardDiskDrive -VMName $vm.operatingsystem -Path c:\vhd\Diff.vhdx




Client Hyper-V in Windows 8

Client Hyper-V is the same computer virtualization technology previously available in Windows Server. In Windows 8 Consumer Preview, the technology is now built into the non-server version of Windows, often called the “desktop” version because it does not run on server-class hardware.
Because Client Hyper-V in Windows 8 Consumer Preview is the same technology as server Hyper-V IT Pros and developers do not need to learn any new tools or commands. You can move virtual machines (VMs) from Client Hyper-V to server Hyper-V. For example, you can build a “test lab” infrastructure hosted entirely on your laptop or desktop machine and export the VMs you create and test from your laptop into production.

Windows PowerShell scripts for managing virtual machines that you create using Client Hyper-V are fully compatible in with Windows Server 8 Hyper-V.

There a few features included in Windows Server 8 Hyper-V that are not included in Client Hyper-V. These include: the remote FX capability to virtualize GPUs (software GPU in RDP 8), Live VM migration, Hyper-V Replica, SR-IOV networking, and synthetic fiber channel.

HARDWARE : Hyper-V requires a 64-bit system that has Second Level Address Translation (SLAT). GB RAM is required. The RAM on your Client Hyper-V machine is allocated and de-allocated dynamically as required by the VMs. You can run several VMs on a Client Hyper-V machine (also called a “host”) that has the minimum 4GB of RAM, but you will need additional RAM for 5 or more VMs, depending on the RAM requirements for each VM.

Client Hyper-V supports server Hyper-V’s “Live Storage Move” capability. This means you can use your VMs fairly independent of the underlying storage. You can move VMs to and from one local drive to another, to a USB stick, or to a remote file share without needing to stop the VM.

To Enable using GUI:

  1. On the Control Panel click “Programs”, and then click “Programs and Features”
  2. Click “Turn Windows features on or off”
  3. Click “Hyper-V”, and then click “OK”, and then click “Close”
To Enable using Powershell :
Enable-WindowsOptionalFeature –FeatureName Microsoft-Hyper-V -Restart

Important :

    You must restart your machine, not just reboot, to complete installation

For more info: Windows 8 Client Hyper-V wiki page (FWLINK) (

Windows Server 8 Beta builds are now available for download

The Windows Server 8 Beta builds are now available for download.  Upgrades from previous builds are not supported or recommended.

To use Windows Server “8” Beta, you need to be aware of the following system requirements*: Component System Requirement
Processor • Minimum: 1.4 GHz 64bit processor
Memory • Minimum: 512 MB RAM
Available Disk Space • Minimum: 32 GB

Note: 32 GB should be considered an absolute minimum value for successful installation. Computers with more than 16 GB of RAM will require more disk space for paging, hibernation, and dump files. Drive DVD-ROM drive Display and Peripherals • Super VGA (800 x 600) or higher-resolution monitor • Keyboard • Microsoft Mouse or other compatible pointing device

*Actual requirements will vary based on your system configuration and the applications and features you choose to install. Processor performance is dependent upon not only the clock frequency of the processor, but the number of cores and the size of the processor cache. Disk space requirements for the system partition are approximate. Additional available hard-disk space may be required if you are installing over a network.