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  • Blog Post: Hyper-V and the Windows Server Technical Preview

    Today we released the Windows Server Technical Preview.  You can read more about this, and how to get the bits yourself, over on the Server & Cloud Blog . Some other resources that are available right now are: The Windows Server Technical Preview release notes: http://technet.microsoft.com/library...
  • Blog Post: Changing Ubuntu Screen Resolution in a Hyper-V VM

    If you install Ubuntu 14.04 inside a Hyper-V virtual machine – you automatically get all the integration components and virtualized drivers.  Including the Hyper-V video driver.  However, if you try to change the screen resolution inside your virtual machine you will notice something odd: There...
  • Blog Post: “Error applying Hard Drive changes” on Generation 2 VMs

    A Microsoft employee recently contacted us with this issue: “When I try and attach a virtual hard disk to a generation 2 virtual machine – I get an error message that says ‘Error applying Hard Drive changes’” It took a bit of conversation – but eventually we figured out what was happening.  Here...
  • Blog Post: Importing a Virtual Machine with an Incompatible Saved State

    This afternoon – an email arrived with the following question for me: “I’m working with on a Hyper-V migration with an import-vm component. I saw what I believe is your post on importing incompatible VMs. We are experiencing an issue where the incompatibility has to do with a bad saved state after the...
  • Blog Post: Posterpedia is now a Universal App!

    I have talked about Posterpedia before.  It is a very handy application that allows you to access electronic versions of our detailed Windows Server Architectural posters.  Well, the authors have released an updated version of it which is a Universal App.  This means you can have it on...
  • Blog Post: ‘Unnamed VM’ could not initialize… The security ID structure is invalid (0x80070539)

    While working on a system recently, I imported an old virtual machine – which then failed to start with this error message: What to do?  Well – thankfully the solution is already documented here: http://support.microsoft.com/kb/2927313/en-us But how did this happen?  And what is going on? Well...
  • Blog Post: Looking at Memory Usage on Hosts when Creating a New VM

    In my house I have two Hyper-V servers running multiple virtual machines with dynamic memory enabled. This can make it a bit tricky when I want to create a new virtual machine - and I need to figure out the best server to use. Thankfully - this little bit of PowerShell comes to the rescue: "Hyper...
  • Blog Post: Updated Documentation on Supported Guest Operating Systems

    A couple of weeks ago I posted about the fact that Windows Server 2012 R2 is not supported on top of Windows Server 2008 R2 . This generated a lot of feedback about the need to improve our documentation for which operating systems are supported on which versions of Hyper-V. So the Hyper-V documentation...
  • Blog Post: Virtualization Fabric Design Considerations Guide

    The Hyper-V documentation team recently released the Virtualization Fabric Design Considerations Guide. You can download this document here: http://gallery.technet.microsoft.com/Virtualization-Fabric-e9402b76 Document Overview: This guide details a series of steps and tasks that you can go through to...
  • Blog Post: Can you run Windows Server 2012 R2 on Windows Server 2008 R2?

    I have been asked this question a couple of times recently.  The odd thing, to me anyway, is that most of the people who have asked me have stated: I read this article: http://msdn.microsoft.com/en-us/library/cc794868(v=ws.10).aspx about supported guest operating systems for Windows Server 2008...
  • Blog Post: Hyper-V Network Connectivity Issues with Emulex Adapters

    I retweeted this late last week, but wanted to mention it here on my blog.  Emulex has just published a blog post talking about a known issue that is causing network connectivity problems for Hyper-V VMs when using Emulex network adapters.  They have also explained how to work around this until...
  • Blog Post: Hyper-V Replica to Azure

    Late last week we announced “Azure Site Recovery”.   This is a new offering that allows you to have Hyper-V virtual machines in your environment replicating to Azure.  This gives you the ultimate protection from site failure. You can read more about this on Brad Anderson’s “In the Cloud...
  • Blog Post: How to get the best disk performance with Linux on Hyper-V

    I was recently reading our documented Best Practices for running Linux on Hyper-V and noticed this section: Use I/O scheduler NOOP for better disk I/O performance. The Linux kernel has four different I/O schedulers to reorder requests with different algorithms. NOOP is a first-in first-out queue that...
  • Blog Post: What version of Linux Supports what in Hyper-V?

    We have been doing a lot of work to increase the functionality of Linux on top of Hyper-V, and we have been contributing the necessary changes directly to the main Linux source.  While this is all good – it has caused confusion for some people as they are trying to figure out which versions of Linux...
  • Blog Post: Programmatically Detecting when a VM Changes State

    Every now and then I get asked how to detect whenever a virtual machine changes state. Usually, people who ask about this have written some code that periodically queries Hyper-V to see what state different virtual machines are in (stopped, running, etc.). What they find is that this is not efficient...
  • Blog Post: Setting up non-administrative control of Hyper-V through PowerShell–Updated

    Yesterday, I told you about how it was now easier to allow a non-administrative user to control Hyper-V . This is nice – but it does mean that this script that I blogged about 4 years ago no longer works. Here is a new one: $myWindowsID=[System.Security.Principal.WindowsIdentity]::GetCurrent...
  • Blog Post: Allowing non-Administrators to control Hyper-V–Updated

    A long time ago, I did a post about how to allow non-Administrative users to control Hyper-V .  Then I did a post that showed you how to script this whole configuration .  Finally, I did a post that showed you how to setup a “Hyper-V Administrators” group to make the whole process easier. Well...
  • Blog Post: Looking for Wasted Space inside Virtual Machines

    Recently, I tried to update the operating system installed inside of one of my virtual machines.  I quickly received an error message stating that I did not have enough free space available to perform the upgrade.  My immediate thought was that I would need to expand the size of the virtual...
  • Blog Post: Gathering Recent Events for a Specific VM

    Imagine this scenario: you login to one of your Hyper-V servers and find that something has gone wrong with a virtual machine.  Maybe the guest operating system is not responding, maybe it is running slower than expected, maybe something else has gone wrong. As you are triaging the problem – you...
  • Blog Post: Quickly Recovering Replication on Hyper-V

    Two weeks ago , I had to recover from a sizable power outage. When this happened, my first priority was to make sure that all of my virtual machines were running well. Once I had done this, my next goal was to get Hyper-V Replica back up and running - so that I would be protected against any future problems...
  • Blog Post: Listing all the IP Addresses used by VMs

    Here is a neat little snippet of PowerShell: Get-VM | ?{$_.State -eq "Running"} |  Get-VMNetworkAdapter | Select VMName, IPAddresses If you run this on a Hyper-V Server it will give you a listing of all the IP addresses that are assigned to running virtual machines: This works whether...
  • Blog Post: Exporting a Virtual Machine Checkpoint

    Something neat that you can do in Windows Server 2012 / Windows 8 or later is to export a virtual machine checkpoint.  You can do this by either: Selecting the checkpoint in the UI and selecting Export from the action pane Using the Export-VMSnapshot cmdlet When you do this, we will actually create...
  • Blog Post: Hyper-V Networking–NIC Teaming

    If you look at the advanced features of a network adapter in Hyper-V, you may have noticed the NIC Teaming option below: And wondered what this was about. In most deployments you will enabled network adapter teaming in the host operating system, and connect a virtual switch to the team.  If you...
  • Blog Post: Understanding Maximum Dynamic Memory from inside a VM

    Dynamic memory is a great feature that allows Hyper-V administrators to get better utilization of their physical memory.  But it can be hard to tell what is going on from inside of a virtual machine.  There are, however, some things that you can do from inside a virtual machine. The first thing...
  • Blog Post: Importing a VM with VHDs in Different Paths

    I was recently given an interesting challenge.  I was asked to show how you could use PowerShell to import a virtual machine; where the virtual hard disks were stored in multiple different locations.  Now, if the virtual hard disks were all in a single location, you could just use the “VHDSourcePath...
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