Browse by Tags

Tagged Content List
  • Blog Post: Hyper-V and "Event ID: 157 - Disk x has been surprise removed"

    After posting about Hyper-V and Event ID 58 the other week - I had a number of people ask me about Event ID 157. They told me that each time they backed up a virtual machine they were seeing this event inside of the virtual machine as well. At first, I could not figure out why they were seeing this...
  • Blog Post: Removing a Missing Network Adapter

    I recently hit a problem with one of my virtual machines. I had copied a virtual hard disk from one server to another, created a new virtual machine that used this virtual hard disk, and found that my scripts did not work anymore. After a bit of inspection I realized what was going on - in moving the...
  • Blog Post: Checking Virtual Machine Health After a Disaster

    Last weekend I suffered a human disaster in my "server room". Which is to say that I knocked down a shelf in my garage and accidentally disconnected the UPS. This, in turn turned off all of my hardware. An hour later I had fixed the shelf, reconnected all the wiring and had booted the servers again....
  • Blog Post: SMB Bandwidth Limits and Shared Nothing Live Migration

    This week I have been discussing the network QoS options available for a Windows Server private cloud. On Wednesday I talked about the SMB bandwidth limit capability - that allows you to specify separate bandwidth limits for virtual machine storage and live migration traffic over SMB. One interesting...
  • Blog Post: Converged Network QoS and Live Migration over SMB

    On Monday I gave you a pointer to a great resource on configuring network QoS in converged networking configurations. One thing that this documentation does not cover is how to configure QoS for Live Migration over SMB. If you are using Live Migration over SMB, and storing virtual machine hard drives...
  • Blog Post: Getting QoS Right with Hyper-V and Converged Networking

    Back in the "olden days" of Windows Server 2008 R2, getting networking right for a Hyper-V private cloud was simple. Annoying - yes. But simple. Basically - you just had to have a separate network adapter (or two) for every class of traffic possible. Thankfully with Windows Server 2012 (and 2012 R2...
  • Blog Post: Hyper-V and "Event ID: 58 - The disk signature of disk 2 is equal to the disk signature of disk 0"

    On Monday I talked about how we had changed backup in Windows Server 2012 R2 to make it scale better. However, there is one annoying downside of this change that I did not discuss. And that is Event ID 58. As I mentioned - we now connect a copy of a virtual machines virtual hard disk back to itself...
  • Blog Post: How Hyper-V Backup Got Better in 2012 R2 (but now requires a SCSI controller)

    Hyper-V has always provided the ability to backup all running virtual machines from the host operating system, without incurring any downtime for the virtual machines being backed up. To do this it utilizes the fantastic VSS (Volume Shadow Copy Services) functionality in Windows. When a user wants to...
  • Blog Post: Hyper-V Backup doesn’t interrupt running virtual machines (anymore)

    Hyper-V has always provided the ability to backup all your virtual machines from the host operating system.  In order to provide a consistent backup of the virtual machine – Hyper-V has traditionally employed two approaches: If the guest operating system has the Hyper-V backup integration service...
  • Blog Post: Finding a Virtual Machine Configuration File

    Oh, how I do like a PowerShell challenge. The other day a colleague asked me this – “Ben, do you have a PowerShell snippet that I could give to a customer that tells them which virtual machine configuration file belongs to which virtual machine?” Now, if you have ever looked at your virtual machine configuration...
  • Blog Post: Copying the VHD of a Generation 2 Linux VM–and not booting afterwards…

    If you have installed Linux in a Generation 2 virtual machine – everything is probably working great for you!  You can even export the virtual machine and import it somewhere else.  However, things will not go well if you just shutdown the virtual machine and copy the virtual hard drive to...
  • Blog Post: Adding a second (and third) management OS adapter to a Virtual Switch

    I was working on a Hyper-V server the other day – and decided that I wanted to connect it to a set of virtual machines that I had been working with.  Unfortunately, I had configured the virtual machines with multiple network interfaces on multiple separate subnets – and my host only had one physical...
  • Blog Post: Hyper-V and Wireless networking

    I have been getting a lot of questions about Hyper-V and wireless networking lately.  Specifically, these questions have been from people saying “why does it work sometimes, and not work other times”.  To give some background – wireless networking is quite tricky for virtualization.  To...
  • Blog Post: “The RPC server is unavailable” with Microsoft Virtual Machine Converter

    When I first tried to perform a physical to virtual migration with the Microsoft Virtual Machine Converter 3.0 – I immediately hit this error message: After a bit of poking around, I was able to figure out the problem.  Microsoft Virtual Machine Converter use WMI, which is blocked on the Windows...
  • Blog Post: Microsoft Virtual Machine Converter 3.0 Now Available

    Yesterday we released the Microsoft Virtual Machine Converter 3.0.  You can download it here: http://www.microsoft.com/en-us/download/details.aspx?id=42497 It has a staggering amount of features.  Including the ability to convert physical computers to virtual machines and to convert VMware...
  • Blog Post: New Hyper-V Whitepaper: High Performance Storage for Clustering

    Our storage performance team has published a fascinating new whitepaper, available here: http://www.microsoft.com/en-us/download/details.aspx?id=44300 This whitepaper steps you through the configuration and testing of a top-of-the-line Hyper-V cluster deployment that is designed to deliver raw storage...
  • 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: ‘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: 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: 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...
Page 1 of 4 (78 items) 1234