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• How can I restore VM on a new Hyper-V server?

  - by jaloplo

  I was working gladly with my VM on my local Hyper-V server. But, after installing some updates on the host the system only show the famous blue screen. I couldn't start my host so I reinstalled it and configured as new Hyper-V server. My VM was in a another disk to prevent this happening but I don't know how to add it as a new VM on new server. In addition, this VM has various snapshots so, how can I add this VM to my new Hyper-V server? UPDATE: I can't do Export/Import because my server crashed before I can't do it.

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• Why is cpu power management not working in Server 2012 with Hyper-V?

  - by Roland

  We've been using Server2008R2 with Hyper-V for a couple of years now and chose it at the time because of its ability to make use of Intel SpeedStep and AMD PowerNow! Now with Server 2012 and Hyper-V V3, all power management abilities seem to be gone. The CPUs are always at full speed and our servers need twice the energy as before while idling. (Yes, the CPU P-states are enabled in the BIOS) Is this by design? Is there a workaround to enable cpu power management again? Despite the great new features of Hyper-V 3, this would be a show-stopper for us since we are very concerned about energy consumption.

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• How to get Hyper-V to recognize that a VM isn't stopping, it's stopped.

  - by Matt Burke

  I have a Hyper-V virtual machine that has some problems. First, its settings are apparently corrupt: The WMI object contained an invalid value in property BIOSNumLock. The WMI object contained an invalid value in property AutomaticStartupAction. Second, I saw something that implied that I could toggle the NumLock checkbox on the BIOS property page to fix the first problem, but the checkbox didn't show up. So I connected to the VM and shut it down. Now (many hours later) Hyper-V claims that the VM is "Stopping". However, when I follow the interweb's directions on forcing a VM offline (i.e. find vmwp and kill it), I can't find vmwp. The VM's WMI object has a PID that doesn't exist, and none of the vmwp processes have this machine's GUID. So, how do I trick Hyper-V into seeing that the machine is offline (or letting me delete it)?

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• How can I restore VM on a new Hyper-V server?

  - by jaloplo

  Hi all, I was working gladly with my VM on my local Hyper-V server. But, after installing some updates on the host the system only show the famous blue screen. I couldn't start my host so I reinstalled it and configured as new Hyper-V server. My VM was in a another disk to prevent this happening but I don't know how to add it as a new VM on new server. In addition, this VM has various snapshots so, how can I add this VM to my new Hyper-V server? UPDATE: I can't do Export/Import because my server crashed before I can't do it.

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• Creating a file server - How can I use a large VHD file in Hyper-V? (700GB)

  - by barfoon

  Hey everyone, After a few discussions (here, here, and here), I am still unable to create a simple VM that will be used as a fileserver hosted on my Hyper-V box. I have created a fixed 700GB SCSI drive (.vhd file), as I have learned an IDE drive of this size is not possible. Not to sound too cynical, but its blown me away at how much trouble its been to create a large amount of space and start using it. What is the best way to create a fileserver with a drive of this size hosted on Hyper-V Server 2008, and how can I get it going??? Inclusion of OS, driver, integration tools etc, anything you feel is required would be greatly appreciated. Extra information I am using the stand-alone version of Hyper-V server, and not Windows Server 2008. I have tried loading the Linux Integration Tools (linked in the comments of the last link above) onto a SUSE 11 VM and the installation fails, the machine cannot see the vhd at all. Thanks very much,

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• Restoring VM's in Hyper-V from a (somewhat) failed VSS backup...

  - by DeliriumTremens

  I attempted to do a backup of our virtualization server when moving from Hyper-V 2008 to R2. I changed the registry settings to register Hyper-V VSS with Windows Server Backup, and sent the backup on it's way while I went on to other things. Apparently the VSS portion didn't back-up the VM's like I had hoped, and after updating Windows Server and Hyper-V to R2, I was unable to restore the VM's correctly. The backup completed and I have all of the files from before the update backed up, but is there any way to restore the VM's from the backup? The vhd's all seem to have old modified dates, and when bringing the machines up from these vhd's they have very old settings. I have found a bunch of avhd files (named according to GUID), but I'm not sure if I can create a VM with the old vhd and merge the snapshots with it.

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• What is hyper-threading and how does it work?

  - by CrazyJugglerDrummer

  I've heard the term hyper-threading thrown around a bit recently, what exactly is hyper-threading and why is it important? (let's get this question on the first page of google results! ;)

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• I'm thinking n+1 in a hyper-v r2 cluster managed by scvmm is not a great idea anymore

  - by tony roth

  Around here the clusters (not hyper-v clusters) are typically configured as n+1, so they are asking me to create a n+1 hyper-v r2 clusters. These will configured with both csv's and live migration and managed via scvmm r2. My thinking is that its a waste in having a node sitting there idle. In my opinion it would be better to have headroom left over for what would traditionally the +1 server spread amongst the N nodes. Anybody have an opinion on this. thanks

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• I'm think n+1 in a hyper-v r2 cluster managed by scvmm is not a great idea anymore

  - by tony roth

  Around here the clusters (not hyper-v clusters) are typically configured as n+1, so they are asking me to create a n+1 hyper-v r2 clusters. These will configured with both csv's and live migration and managed via scvmm r2. My thinking is that its a waste in having a node sitting there idle. In my opinion it would be better to have headroom left over for what would traditionally the +1 server spread amongst the N nodes. Anybody have an opinion on this. thanks

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• How To Configure Remote Desktop To Hyper-V Guest Virtual Machines

  - by Brian Jackett

  Configuring Remote Desktop (RDP) from a host Hyper-V machine to a guest virtual machine can be tricky, so this post is dedicated to the issues and resolution steps I went through to allow RDP.  Cutting to the point, below are the things to look for followed by some explanation about my scenario if you care to read.  This is not an exhaustive list of what is required, just the items that were causing problems for my particular scenario. Requirements Allow Remote Desktop Connections in guest OS. The network adapter type must allow communication with host machine (e.g. use an “Internal” virtual adapter.) If running Server 2008 R2 on guest, network discovery mode must be turned on. If running Server 2008 R2 on guest, the services supporting network discovery mode must be running: - DNS Client - Function Discovery Resource Publication - SSDP Discovery - UPnP Device Host My Environment     A quick word about my environment.  I am running Windows Server 2008 R2 with Hyper V on my laptop and numerous guest VMs running Windows Server 2003 R2 or Windows Server 2008 R2.  I run a domain controller VM and then 1 or 2 SharePoint servers depending on my work needs.  I’ve found this setup to work well except when it comes to the display window for my VMs. The Issue     Ever since I began running Hyper-V I haven’t been able to RDP to my guest VMs which means the resolution for my connection windows ha been limited to what the native Hyper-V connections allow.  During personal use I can put the resolution up to 1152 x 864, but during presentations I am usually limited to a measly 800 x 600.  That is until today when I decided to fully investigate why I couldn’t connect via RDP.     First a thank you to John Ross (@johnrossjr), Christina Wheeler (@cwheeler76) and Clayton Cobb (@warrtalon) for various suggestions while I was researching tonight.  As it turns out I had not 1, not 2, but 3 items preventing me from using RDP.  Let’s dig into the requirements above. Allow RDP Connection     This item I had previously taken care of, but it bears repeating because by default Windows Server 2008 R2 does not allow RDP connections.  Change the setting from “Don’t allow…” to whichever “Allow connections…” setting suits your needs.  I chose the less secure option as this is just my dev laptop. Network Adapter Type     When I originally configured my VMs I configured each to use 2 network adapters: one using the physical ethernet adapter for internet use and a virtual private adapter for communication between the VMs.  The connection for the ethernet adapter is an "”External” adapter and thus doesn’t connect between the host and guest.  The virtual private adapter allowed communication ONLY between the VMs and not to my host.  There is a third option “Internal” which allows communication between VMs as well as to the host.  After finding out this distinction I promptly created an Internal network adapter and assigned that to my VMs. Turn On Network Discovery     Seems like a pretty common sense thing, but in order to allow remote desktop connections the target computer must able to be found by the source computer (explained here.)  One of the settings that controls if a computer can be found on the network is aptly named Network Discovery.  By default Windows Server 2008 R2 turns Network Discovery off for security purposes.  To enable it open up the Network and Sharing Center.  Click “Change Advanced Sharing Settings” on the left.  On the following screen select “Turn on network discovery” for the currently used profile and click Save Settings.  You may notice though that your selection to turn on network discovery doesn’t save.  If this is the case then you most likely don’t have the supporting services running (as was my case.) Network Discovery Supporting Services     There are a total of 4 services (listed again below) that need to be running before you can turn on network discovery (explained here.)  The below images highlight these services.  In my guest VM I found that I had DNS Client already running while the other 3 were disabled.  I set them all to enabled and started the ones that were stopped.  After this change I returned to the Sharing settings screen and found that Network Discovery was turned on.  I’m not sure whether this was picking up my attempt to turn it on previously or if starting those services turned it on.  Either way the end result was a success. - DNS Client - Function Discovery Resource Publication - SSDP Discovery - UPnP Device Host Before and After Results     The first image is the smaller square shaped viewing window used by the Hyper-V native connection.  The second is the full-screen RDP connection in all its widescreen glory. Conclusion     Over the past few months I’ve found Hyper-V to be very useful for virtualizing my development environments, but I’ve also had a steep learning curve to get various items configured just right.  Allowing RDP connections to guest VMs was one area that I hadn’t been able to get right for the longest time.  Now that I resolved these issues I hope that others can avoid the pitfalls that I ran into.  If you know of any other items I left off feel free to let me know.        -Frog Out   Links Turning on Network Discovery http://sqlblog.com/blogs/john_paul_cook/archive/2009/08/15/remote-desktop-connection-on-windows-server-2008-r2.aspx Services required for Network Discovery http://social.technet.microsoft.com/Forums/en-US/winservergen/thread/2e1fea01-3f2b-4c46-a631-a8db34ed4f84

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• How to increase screen resolution in Hyper-V

  - by Saad

  I am using Ubuntu 12.04 on Hyper-V in windows 8. I want to increase the resolution so that Ubuntu window can occupy my whole screen. Does anyone have any idea of how it can be done ? I found one solution http://nramkumar.org/tech/blog/2013/05/04/ubuntu-under-hyper-v-how-to-overcome-screen-resolution-issue/, I have installed OpenSSH server on Ubuntu and Xming and Putty on windows. I am not sure what hostname to use to connect to Ubuntu (running in Hyper-V), using [email protected] or username@localhost in the hostname field returns error "Network error:connection refused". Can someone help me figure out what i am doing wrong ?

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• HOWTO: Disable complex password policy on Hyper-V Server 2008?

  - by Ian Boyd

  How do you disable the password complexity requirements on a Microsoft Hyper-V Server 2008 R2? Keep in mind that when you log into the server, the only UI you have is: And you cannot run gpedit.msc: C:\Users\Administrator>gpedit.msc 'gpedit.msc' is not recognized as an internal or external command, operable program or batch file. because there are no .msc snap-ins installed with Microsoft Hyper-V Server 2008 R2. The problem comes when you're trying to add an account to the server, so you can manage it, but it doesn't like most passwords: And, predictably, typing NET HELPMSG 2245 gives you The password does not meet the password policy requirements. Check the minimum p assword length, password complexity and password history requirements. i hoped it would have been a friendly user experience, and either: offered to disable the password policy tell me how to disable the password policy tell me how to check the minimum password length, password complexity and password history requirements. Password Complexity Requirements The Microsoft's default password complexity for Server Core is: Passwords cannot contain the user’s account name or parts of the user’s full name that exceed two consecutive characters. Passwords must be at least six characters in length. Passwords must contain characters from three of the following four categories: 1.English uppercase characters (A through Z). 2.English lowercase characters (a through z). 3.Base 10 digits (0 through 9). 4.Non-alphabetic characters (for example, !, $, #, %). External links Technet Forums: Hyper-V Server disable complex passwords Technet: Passwords must meet complexity requirements of the installed password filter Update: 2k views? So many people keep coming coming to it: up-vote it!

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• How do I install the evaluation version of Windows Server 2012R2 VHD within a Windows Server 2008R2 Hyper-V system?

  - by Paul Hale

  I have a windows server 2008R2 running hyper-v. I have downloaded the Windows Server 2012RC DC Version from here... http://technet.microsoft.com/en-us/evalcenter/dn205286.aspx I am "forced" to install a download app that copy's a .vhd file to my chosen directory. The instructions on this page... http://technet.microsoft.com/library/dn303418.aspx say... To install the VHD Download the VHD file. Start Hyper-V Manager. On the Action menu, select Import Virtual Machine. Navigate to the directory that the virtual machine file was extracted to and select the directory (not the directory where the VHD file is located). Select the Copy the virtual machine option. Confirm that the import was successful by checking Hyper-V Manager. Configure the network adapter for the resulting virtual machine: right-click the virtual machine and select Settings. In the left pane, click Network Adapter. In the menu that appears, select one of the network adapters of the virtualization server, and then click OK. Start the virtual machine. Where it says "Navigate to the directory that the virtual machine file was extracted to and select the directory (not the directory where the VHD file is located). Select the Copy the virtual machine option." Well nothing has been extracted as far as I can tell? and if it has, I have no idea where or what im looking for? I tried creating a new VM and using the downloaded .vhd file but I got an error saying that the .vhd file is an incompatible format. Can anybody help me out please? Thanks, Paul

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• Is Hyper-V server suitable as a desktop testbench?

  - by Thomas.Winsnes

  At the moment we are running a test bench with several desktop computers, that are reimaged every time we need to test on a different operation system. Also because different versions of our software is tested on each image, we have to install our software every time we want to test it. The problem we have had with going with a virtualization technology is that our software is depending on directx/opengl and 3D acceleration, and this has not been something that virtual machines have excelled at. With the release of SP1 for Windows 7 and Server 2008 R2 Hyper-V has gotten better 3D acceleration support, so we are looking into virtualizing our testbench using this. Our test scenario would most likely be something close to this: 1. Remote into the hyper-V server and load the test VM needed for the current tests 2. Remote into the VM and install the new version of the software 3. Run the tests It would be nice, but not essential, if our support team could remote into the VMs to match the users OS+software combination when doing support. Does anyone have any experience with this kind of settup with hyper-v?

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• Hyper-V for Developers Part 1 Internal Networks

  Over the last year, weve been working with Microsoft to build training and demo content for the next version of Office Communications Server code-named Microsoft Communications Server 14.  This involved building multi-server demo environments in Hyper-V, getting them running on demo servers which we took to TechEd, PDC, and other training events, and sometimes connecting the demo servers to the show networks at those events.  ITPro stuff that should scare the hell out of a developer! It can get ugly when I occasionally have to venture into ITPro land.  Lets leave it at that. Having gone through this process about 10 to 15 times in the last year, I finally have it down.  This blog series is my attempt to put all that knowledge in one place if anything, so I can find it somewhere when I need it again.  Ill start with the most simple scenario and then build on top of it in future blog posts. If youre an ITPro, please resist the urge to laugh at how trivial this is. Internal Hyper-V Networks Lets start simple.  An internal network is one that intended only for the virtual machines that are going to be on that network it enables them to communicate with each other. Create an Internal Network On your host machine, fire up the Hyper-V Manager and click the Virtual Network Manager in the Actions panel. Select Internal and leave all the other default values. Give the virtual network a name, and leave all the other default values. After the virtual network is created, open the Network and Sharing Center and click Change Adapter Settings to see the list of network connections. The only thing I recommend that you do is to give this connection a friendly label, e.g. Hyper-V Internal.  When you have multiple networks and virtual networks on the host machines, this helps group the networks so you can easily differentiate them from each other.  Otherwise, dont touch it, only bad things can happen. Connect the Virtual Machines to the Internal Network Im assuming that you have more than 1 virtual machine already configured in Hyper-V, for example a Domain Controller, and Exchange Server, and a SharePoint Server. What you need to do is basically plug in the network to the virtual machine.  In order to do this, the machine needs to have a virtual network adapter.  If the VM doesnt have a network adapter, open the VMs Settings and click Add Hardware in the left pane.  Choose the virtual network to which to bind the adapter to. If you already have a virtual network adapter on the VM, simply connect it to the virtual network. Assign IP Addresses to the Virtual Machines on the Internal Network Open the Network and Sharing Center on your VM, there should only be 1 network at this time.  Open the Properties of the connection, select Internet Protocol Version 4 (TCP/IPv4) and hit Properties. In this environment, Im assigning IP addresses as 192.168.0.xxx.  This particular VM has an IP address of 192.168.0.40 with a subnet mask of 255.255.255.0, and a DNS Server of 192.168.0.18.  DNS is running on the Domain Controller VM which has an IP address of 192.168.0.18. Repeat this process on every VM in your environment, obviously assigning a unique IP address to each.  In an environment with a domain controller, you should now be able to ping the machines from each other. What Next? After completing this process, heres what you still cannot do: Access the internet from any of the VMs Remote desktop to a VM from the host Remote desktop to a VM over the network In the next post, well take a look configuring an External network adapter on the virtual machines.  Well then build on top of that so that you can RDP into the VMs from the host machine and over the network.Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• hyper-v fails when attaching more disk to VM. The VM won't start and generates an error

  - by CasperDK

  I'm lost at what to do about this: Hi... System: Windows 2008 R2 Hyper-V farm running with failover cluster with a EVA 4400 as backend. When I attach a new disk to a VM it fails when I try to start it. If I move the VM to another, say node 1, I can add the disk and I can get them to start. If I move the VM back to node 2 where the problem arose and the VM is running, I get an error during live migration and the VM fails back to node1 where it did run... So it's like there is something wrong with Hyper-V on node 2 and not node 1. Also node 3 has the same issue. Restarting the nodes is NOT an option since I will have this problem again at a later time AND because not all the VMs can run on node 1 which means my client company will experience downtime on the VMs not running on node 1. Any fix for this? An update I have missed perhaps? It has been two years... Here are the errors: An error ocurred while attempting to change the state of virtual machine XXX. 'XXX' failed to start. Microsoft Emulated IDE Controller (Instance ID {83F8638B-8DCA-4152-9EDA-2CA8B33039B4}): Failed to power on with Error 'A device attached to the system is not functioning.' Failed to open attachment 'X:\XXX.vhd'. Error: 'A device attached to the system is not functioning.' Failed to open attachment 'X:\XXX.vhd'. Error: 'A device attached to the system is not functioning.' 'XXX' failed to start. (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) Microsoft Emulated IDE Controller (Instance ID {83F8638B-8DCA-4152-9EDA-2CA8B33039B4}): Failed to power on with Error 'A device attached to the system is not functioning.' (0x8007001F). (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) 'XXX': Failed to open attachment 'X:\XXX.vhd'. Error: 'A device attached to the system is not functioning.' (0x8007001F). (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) 'XXX': Failed to open attachment 'X:\XXX.vhd'. Error: 'A device attached to the system is not functioning.' (0x8007001F). (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) An error ocurred while attempting to change the state of virtual machine XXX. 'XXX' failed to start. Microsoft Emulated IDE Controller (Instance ID {83F8638B-8DCA-4152-9EDA-2CA8B33039B4}): Failed to power on with Error 'A device attached to the system is not functioning.' Failed to open attachment 'X:\XXX.vhd'. Error: 'A device attached to the system is not functioning.' Failed to open attachment 'X:\XXX.vhd'. Error: 'A device attached to the system is not functioning.' 'XXX' failed to start. (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) Microsoft Emulated IDE Controller (Instance ID {83F8638B-8DCA-4152-9EDA-2CA8B33039B4}): Failed to power on with Error 'A device attached to the system is not functioning.' (0x8007001F). (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) 'XXX': Failed to open attachment 'X:\XXX.vhd'. Error: 'A device attached to the system is not functioning.' (0x8007001F). (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) 'XXX': Failed to open attachment 'X:\XXX.vhd'. Error: 'A device attached to the system is not functioning.' (0x8007001F). (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) An error ocurred while attempting to change the state of virtual machine XXX. 'XXX' failed to start. Microsoft Emulated IDE Controller (Instance ID {83F8638B-8DCA-4152-9EDA-2CA8B33039B4}): Failed to power on with Error 'A device attached to the system is not functioning.' Failed to open attachment 'c:\clusterstorage/volume1/XXX.vhd'. Error: 'A device attached to the system is not functioning.' Failed to open attachment 'c:\clusterstorage/volume1\XXX.vhd'. Error: 'A device attached to the system is not functioning.' 'XXX' failed to start. (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) Microsoft Emulated IDE Controller (Instance ID {83F8638B-8DCA-4152-9EDA-2CA8B33039B4}): Failed to power on with Error 'A device attached to the system is not functioning.' (0x8007001F). (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) 'XXX': Failed to open attachment 'c:\clusterstorage/volume1\XXX.vhd'. Error: 'A device attached to the system is not functioning.' (0x8007001F). (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) 'XXX': Failed to open attachment 'c:\clusterstorage/volume1\XXX.vhd'. Error: 'A device attached to the system is not functioning.' (0x8007001F). (Virtual machine 36563C78-65B5-4C40-A52D-689BB39E8B08) In the Hyper-V logs I found some more errors: In the hyper-v VMMS logs I have this: 'ServerName' failed to perform the operation. The virtual machine is not in a valid state to perform the operation. (Virtual machine ID 0A6CC4A9-39D6-4413-8CF0-B6DAA35B68D7)

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• How to Remove a VM From Hyper-V Without Deleting the Configuration File?

  - by Steven Murawski

  I'm in the process of moving a number of virtual machines that are homed on shared storage (a file share, though shared cluster disk would work as well) to a new VM host with access to the same shared storage. The new host is a different build version (moving from Windows Server 2012 Beta to Windows Server 2012 RC - though this same process could be used with migrations of Windows Server 2008/2008 R2 to Windows Server 2012 as well), so I cannot migrate the machine with inbox tooling. I need to remove the VM from management of the source Hyper-V host in order to import the VM to the new Hyper-V host. I want to retain the configuration file, so I can import the VM as it stands and not need to reconfigure it. The VHD files are rather large and they are staying on the same file share, so I'd rather not duplicate them during the move process.

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• Virtualisation : Microsoft sort la RC d'Hyper-V Server 2012 qui supporte jusqu'à 4 téraoctets de RAM

  Virtualisation : Microsoft sort la RC d'Hyper-V Server 2012 Disponible en téléchargement gratuit La conférence TechEd North-America a été cette semaine l'occasion pour Microsoft de présenter Hyper-V Server 2012 et d'annoncer la disponibilité de sa Release Candidate en téléchargement gratuit. C'était aussi l'occasion pour Jeff Woolsey, Microsoft Principal Program Manager, d'offrir plus de détails sur les nouveautés de ce moteur de virtualisation (hyperviseur), en dehors de ce que l'on savait sur son intégration avec Windows Server 2012 (ex. Windows Server 8)...

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• Remotely connecting to a Hyper-V hosted VM's console.

  - by billpg

  Hi everyone. I've just managed to successfully move an aging beige box into a Hyper-V virtual machine. We used to use the beige box by walking over and sitting at the computer itself, but we can't do that so easily when its inside the Hyper-V system. Is there a way please to access the VM's console from a workstation running XP Pro? Please note that its an obscure OS running inside the VM, so installing a VNC or similar service inside the VM is not an option. Many thanks.

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• Hyper-V networking....still not sure which way to go??

  - by CZhale

  We have our Hyper-V server up and running (Windows 2008 ENT SP2) and started to create some of our VMs. The server has 4 total nics. 2 onboard Broadcom 1gb nic cards and a pci dual port Intel Pro cards 1gb. Right now, I have setup 1 broadcom nic to be the hyper-v host nic, and setup the other broadcom nic for the VMs. We are not using the Intel Nics....should we be thinking about teaming?Link Aggregation?? I just want to achieve the best possible setup for the network, but have read many things for and against teaming the nics?? Thoughts?

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• Hyper-V Ubuntu 10.04, Filesystem suddenly becomes Read-Only?

  - by Daniel Upton

  We are running a Ubuntu 10.04 VM on a Hyper-V system, The VM is dedicated to running one of our web applications. We have enabled the Hyper-V drivers in /etc/initramfs-tools/modules like so: hv_vmbus hv_storvsc hv_blkvsc hv_netvsc And updated the kernel image like so: $ update-initramfs -u And all was good... until.. This morning i got a support request that our web application was throwing an error 500, so i checked the logs and nothing was there. Then I remembered that I had seen this on another of our ubuntu servers so I... $ touch foo.txt And my suspicions were confirmed: touch: cannot touch `foo.txt': Read-only file system Why is the filesystem randomly becoming readonly? Is this only in Ubuntu on HV? Is it a problem on RedHat or Cent?

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• Quad Core host with hyper-threading, how many processors to configure in VirtualBox?

  - by Anthony

  I have a quad-core i7 processor with hyperthreading (8 logical cores), when I configured a virtual machine to use 8 processors, VirtualBox gave me a warning saying that I only have four cores (which is true) and that this may cause a performance issue. But hyper-threading is a hardware feature, so the OS sees 8 cores and it sends instructions to all 8. What if setting it to 4 caused the VM to use 2 cores (4 threads) instead of 4 simultaneous threads (on all 4 cores)? Does the warning I got take into account that my machine has hyper-threading?

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• Does SQLIO lie when run from a Hyper-V guest on a VHD?

  - by ScottStonehouse

  SQLIO seems like a useful tool. I thought it would be interesting to try to measure the speed difference between a physical disk and a VHD. So I ran SQLIO on the Hyper-V host on the physical drive. Results seemed reasonable. Then I ran it from the guest to test the vhd (on the same physical disk). I expected it to be a bit slower. But instead it was way faster - like 0ms average latency. So I'm trying to learn something here. It seems like hyper-v is fooling SQLIO somehow but I don't understand it well enough to figure it out. It's a dynamic vhd, no snapshots or anything, and the vhd is the only file on the disk. The physical disk is actually a two SAS drive RAID 1.

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• Suggestions for splitting server roles amongst Hyper-V virtual servers / RAID6 or RAID10? / AppAssure

  - by Anon

  We have 2 Hyper-V hosts at present running 1 virtual server that was converted from a physical box running all roles. My plan is to split the roles over various virtual machines, upgrading to the latest software versions as I go, and use the backup server as a standby in case the main server fails. AppAssure backup software has a feature called Virtual Standby, so the VHD's can be ready to be fired up on the backup server if necessary. Off-site backups will be done via external USB drive for now. I'm just seeking some input/suggestions into how I'm planning to split the roles out amongst various virtual servers. Also, I'm curious how to setup the storage on the servers. We do not have any NAS's, SAN'S or any budget for this. What would the best RAID level be to use? I'm thinking either RAID6 (which is currently used) however I'm concerned about the write speeds, or RAID10 but again I'm worried that I can only lose 1 drive (from the same mirror) as opposed to any 2 with RAID6. I realise I have a hot swap for this, but what if a further drive fails during a rebuild? Is the write penalty of RAID6 worth the extra reliability over RAID10? Or will it be too slow with all the roles I am planning, therefore RAID10 is my only real option? The reason for the needed redundancy is I am the only technician and I'm not always on-site. Options I've considered: 1) 5 drives in RAID6 set, 200gb for host OS, rest for VM storage. 1 drive for hot swap - this is how it is currently setup 2) 4 drives in RAID10 set, 200gb for host OS, rest for VM storage. 2 drives for hot swap 3) 4 drives in RAID10 set for VM storage, 2 drives in RAID1 set for host OS. No drives for hot swap - While this is probably the best option with the amount of drives I have, I don't like the idea of having no hot swap 4) 3 drives in RAID6 set for VM storage, 2 drives in RAID1 set for host OS. 1 drive for hot swap All options give us enough storage capacity for our files, etc. We don't have any budget for extra drives or extra hot swap HD chassis for the servers. We have about 70 clients and about 150 users. MAIN SERVER Intel Xeon 5520 @ 2.27 GHz (2 processors) 16GB RAM 6 x 1TB Seagate Barracuda ES.2 Enterprise SATA drives Intel SRCSATAWB RAID controller Virtual machine workload using Hyper-V on Windows Server 2008 R2: DC01 - Active Directory Domain Controller / DNS server / Global catalog - 1GB RAM DC02 - Active Directory Domain Controller / DNS server / Global catalog - 1GB RAM Member Server - DHCP server, File server, Print server - 1GB RAM SCCM Member Server - 4GB RAM Third Party Software Member Server - A/V server, Ticketing software, etc - 4GB RAM Exchange 2007 - 4GB RAM - however we are probably migrating to a hosted solution, therefore freeing up resources BACKUP SERVER Intel Xeon E5410 @ 2.33GHz (2 processors) 16GB RAM 6 x 2TB WD RE4 SATA drives Intel SRCSASRB RAID controller Virtual machine workload using Hyper-V on Windows Server 2008 R2: AppAssure backup software - 8GB RAM

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• Windows 8.1 Professional Hyper-V - can I create my own linux VM through it?

  - by KevinM1

  I have a Windows 8.1 Professional desktop, and would like to have a Linux Mint VM on it so I can do some opensource web development work. I've tried VirtualBox, but it's giving me an IO error during the Mint .iso installation. VMWare Player flat out tells me it can't install because I have Hyper-V on my machine by default. My biggest concern is nuking the desktop, which is where I do most of my non-development work/browsing/etc. The desktop seems to be listed as a VM itself in the Hyper-V Manager, and I don't want to accidentally break it. So, two questions: Can I create the Mint VM I want/need for my work? Can I do it without messing up the desktop?

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