Virtualization

How can we improve the virtualization platform and management in Windows Server?

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  1. Hyper-V CimSession Caching Bug

    The Server 2016 Hyper-V module caches CimSessions, presumably to make queries for related entities faster. The problem is that it also caches explicitly provided CimSessions that it does not own the lifetime of. So, if you ever use a CimSession with a Hyper-V cmdlet, then close that session, Hyper-V will try to use that disposed CimSession for any future interaction with the host in question. This is wrong, you can't cache objects with a lifetime you don't control without at least handling the case when that lifetime has been ended by the actual owner of the object.

    Repro:
    $someHyperVServer =…

    2 votes
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      0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
    • Specify CPU Cores when creating new VM

      In Virtual Machine Manager it't not possible to specify vCores during the "New Virtual Machine Wizard"
      Make a possiblity to specify vCores (like "Assing Memory").
      Or a possiblity to change the default vCore amount (1 core).

      3 votes
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        0 comments  ·  Management tools  ·  Flag idea as inappropriate…  ·  Admin →
      • Add support for shared folders between VM and Host like in virtualbox

        Access host folders from guest and vice versa withount sharing them on the network, so there is less attack surface.

        1 vote
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          0 comments  ·  Guest capabilities  ·  Flag idea as inappropriate…  ·  Admin →
        • Virtual IPMI device for Nested Hypervisors

          Now that we have the ability to nest hyper-v, a virtual IPMI device would be pretty nice to teach VMM bare metal deployment.

          1 vote
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            0 comments  ·  Guest capabilities  ·  Flag idea as inappropriate…  ·  Admin →
          • GPU Partitioning

            DDA is awesome and great, but GPU partitioning needs to be on the road map. Live migration of GPU partitioned VMs too. Feature parity with vmWare and XenServer.

            1 vote
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              0 comments  ·  Graphics  ·  Flag idea as inappropriate…  ·  Admin →
            • Add VM template support

              Give the ability to convert a VM to a template, or provide a simple way to sysprep / generalize a machine on import - like shown in VMware.

              Should be a basic Hyper-V feature.

              7 votes
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                0 comments  ·  Hypervisor  ·  Flag idea as inappropriate…  ·  Admin →
              • USB 2.0 & 3.0 Passthru for Hyper-V (Windows Server 2016)

                Currently, if I want to plug any USB 2.0 or 3.0 device into my Hyper-V host and use it through my VM it will not work.

                Make it so number one...

                9 votes
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                  2 comments  ·  Storage  ·  Flag idea as inappropriate…  ·  Admin →
                • High Resolution VMConnection for Linux

                  Support for high resolution VMConnection with Windows is great in the 1709 release. When configured as an Enahnced Session, it's capable of dynamically resizing due to its use of RDP.

                  Linux won't have RDP built-in which is required at the moment for Enhanced Sessions, but it would be great if the Hyper-V team could come up with a way to support dynamically resizing Linux's most popular Window Systems... X & Wayland.

                  I'm not sure how to support X & Wayland. A .deb & .rpm package that installs an "agent" or "Integration Component" that enables this would be great until Microsoft…

                  2 votes
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                    1 comment  ·  VMConnection & remoting  ·  Flag idea as inappropriate…  ·  Admin →
                  • Windows Server 2016 Hyper-V GUI for DDA

                    I would like to see a GUI set up so that we can find the hardware that we want (PCI Express Devices or USB) and mount them or unmount them via a GUI. This is a lot easier than powershell. Click to mount/unmount hardware from host to VM or vice versa.

                    More people would use this feature and it would be easier to mount and unmount specific hardware items.

                    6 votes
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                      1 comment  ·  Management tools  ·  Flag idea as inappropriate…  ·  Admin →
                    • Auditing of virtual machine connections

                      I raised that question in https://social.technet.microsoft.com/Forums/windowsserver/en-US/eac58596-2ce1-4612-91be-5b4da7ec4aa3/auditing-vm-connections?forum=winserverhyperv, but obviously that features is missing. I´d like to see auditing of virtual machine connections, i.e. which (obviously authenticated and authorized) user connected (or later disconnected) to which virtual machine (name, guid).
                      Thanks
                      Joachim Lindenberg

                      3 votes
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                        0 comments  ·  Hypervisor  ·  Flag idea as inappropriate…  ·  Admin →
                      • AMD Ryzen support in Hyper-V

                        Please support AMD Ryzen processors including nested virtualization on Windows 10/2016.

                        7 votes
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                          1 comment  ·  Hypervisor  ·  Flag idea as inappropriate…  ·  Admin →
                        • Allow me to set a new minimum memory while VM is running

                          I normally next-next-next-finish and end up with VMs set to 8GB max RAM and 512MB minimum. Windows seems to absolutely sip RAM however, and never come close to using the available RAM.

                          So I go to increase the RAM...and I get an error messagethat I cannot change the minimum RAM while the VM is running or paused.

                          Is there a functional reason for this? It drives me bonkers.

                          6 votes
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                            1 comment  ·  Memory  ·  Flag idea as inappropriate…  ·  Admin →
                          • Hyper-V Default Microsoft Hyper-V Video Adapter

                            Introduce a way to either completely remove the default 'Microsoft Hyper-V Video' adapter, or reassign it as a secondary adapter, when a DDA (SR-IOV) graphics adapter is being passed through to the VM.

                            We have a Hyper-V Server 2016 with a Windows 10 Pro VM configured with a Direct Device Assignment (DDA) GPU passed through to the VM, which is working and numerous tests have demonstrated that the graphics card is indeed able to operate at native speeds while attached to the VM.

                            The problem we're having is only OpenGL software calls work - Direct 3D doesn't work, and any…

                            5 votes
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                              0 comments  ·  Graphics  ·  Flag idea as inappropriate…  ·  Admin →
                            • Add-VMGroupMember does not work

                              Add-VMGroupMember does not seem to work as described in https://technet.microsoft.com/en-us/itpro/powershell/windows/hyper-v/add-vmgroupmember
                              Just do
                              $vm = Get-VM -Name "ABC"
                              Add-VMGroupMember -Name "XYZ" -VM $vm

                              Add-VMGroupMember : The operation failed.
                              At line:1 char:1
                              + Add-VMGroupMember -Name "CrmDBClu" -VM $vm -Verbose
                              + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                              + CategoryInfo : InvalidArgument: (:) [Add-VMGroupMember], Virtualizatio
                              nException
                              + FullyQualifiedErrorId : InvalidParameter,Microsoft.HyperV.PowerShell.Commands.A
                              ddVMGroupMember

                              PowerShell version: 5.1.14393.1480
                              Windows Server 2016

                              1 vote
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                                0 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                              • Add a virtual hardware firewall to Hyper-V

                                Azure already has some sort of Hyper-V firewall. Bring this to the core Windows Server/Hyper-V product so that we can introduce a virtual hardware firewall layer in our software-defined networking. This is really key.

                                3 votes
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                                  1 comment  ·  Hypervisor  ·  Flag idea as inappropriate…  ·  Admin →
                                • Fix virtual TPM in Linux guests

                                  I run CentOS 7 and RHEL 7 virtual machines on a Hyper-V Server 2016.

                                  Virtual TPMs in the VMs somehow worked, at least as entropy sources, before June 2017 Patch Tuesday. After I've applied the latest cumulative patch every TPM got broken on the next VM restart.

                                  The bug is a regression between 14393.1230 and 14393.1358.
                                  (I've downgraded and everything seems fine now.)

                                  2 votes
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                                    0 comments  ·  Misc  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Establish at least feature parity with the latest VMware vSphere, including web host/cluster management

                                    That includes ease of use, like the (distributed) vSwitch implementation VMware has.

                                    1 vote
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                                      0 comments  ·  Management tools  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Add basic disk and network usage counters in console

                                      CPU counter is useful, but I more often want to see whether the VM is using a lot of disk access. Adding a column to Hyper-V console for this, even if it only updates every 30 secs, would give me a better idea of what machine is using the disk most.

                                      3 votes
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                                        1 comment  ·  Management tools  ·  Flag idea as inappropriate…  ·  Admin →
                                      • VSS Hyper-V VM bug

                                        There is a bug, uncovered when using Veeam backup software which they describe as -

                                        "Application-aware processing of Active Directory domain controllers running on guest OS other than Windows Server 2016 fails with the “Failed to create VM recovery checkpoint” error (32770). This is a Hyper-V 2016 issue that Microsoft is planning to address in the future update."

                                        Any news on a fix for this would be great.

                                        8 votes
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                                          7 comments  ·  Bugs  ·  Flag idea as inappropriate…  ·  Admin →
                                        • vmrs

                                          give option to disable VMRS file in expense to lose quick migration. in summary: i do not want allocate disk for the memory i allocate to guest VM.
                                          Please update the docs to mention the need for extra space for VMRS files.
                                          for details: https://social.technet.microsoft.com/Forums/en-US/34fb9792-6ae4-474c-a153-3ac825645fe7/vmrs-files?forum=winserverhyperv

                                          2 votes
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                                            0 comments  ·  Hypervisor  ·  Flag idea as inappropriate…  ·  Admin →
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