Updates announcements and testing


  • XCP-ng Team



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  • Hi

    I've a problem with freezing Windows VMs after applaying latest updates - do You know anything about it? Those vms have guest tools from citrix.


  • XCP-ng Team

    I haven't heard of it until now.



  • @akurzawa I also experienced an issue after the update as well. After the host rebooted and I tried turning on a Windows 10 VM it hung on the Windows boot screen.

    • I eventually force rebooted

    • Force shutdown + Change CPU and RAM (not sure if the resource adjustments helped of not)

    • Start VM and it came up in Windows recovery mode

    In the windows recovery mode I just exited and it continued the boot process. This time it booted successfully but I was greeted with the below message upon login.
    6c585cde-511c-453e-85e7-ebc9b4156ad3-image.png

    I had to use XCP-ng center to use keyboard shortcuts to select yes on the dialog box as mouse input was not working. After the restart everything is working as usual again.

    I also have the Windows Updates based guest tools enabled on this VM.

    @stormi I think this has to do with the new version of guest tools Citrix has pushed from their release of CH8.1. Checking the services they now show major version 9. Not sure if @akurzawa is facing the exact same issue or a variant of it?

    eeddbde4-3b35-42c9-a108-c331a5d74dee-image.png


  • XCP-ng Center Team

    This smells like windows pv drivers upgrades. Had similiar effects on various VMs.


  • XCP-ng Team

    FYI: https://support.citrix.com/article/CTX235404

    "Important: Updating to this version of the driver removes the quiesced snapshots capability of the VM. If you are using quiesced snapshots and wish to retain this functionality, do not adopt these 9.0.0.x drivers."

    They do not tell about crashing VMs though 🙂



  • Citrix also has a long history of problematic VM guest-tools. Race conditions with broken drivers, unbootable VMs, broken agents... It's a pain in the a**.
    If you like your VMs: Always make a snapshot of every VM before updating the tools.

    Is known why they remove the VSS-functionality? I don't get why they remove features (again).



  • @stormi said in Updates announcements and testing:

    FYI: https://support.citrix.com/article/CTX235404

    "Important: Updating to this version of the driver removes the quiesced snapshots capability of the VM. If you are using quiesced snapshots and wish to retain this functionality, do not adopt these 9.0.0.x drivers."

    They do not tell about crashing VMs though 🙂

    I read the support article hoping for more details on how to "...retain this functionality, do not adopt these 9.0.0.x drivers." but the article does not mention that either.

    I did not opt to install the new guest tools at any point. I only shutdown the VM to complete the host patches.
    Also see the image below, unless it installs guest tools through a side channel that does not show in the Windows updates history.ceaefbc8-6188-43c7-a985-09f5936047fb-image.png

    Would simply disabling the "Windows Update tools" advanced option in XOA/XO stop it from adopting the new guest tools?


  • XCP-ng Team

    I have pushed an update to the netdata and netdata-ui packages.

    No need to reboot after installing it even if XO tells you so.

    It fixes an upstream issue where in some cases the cache size on disk grows indefinitely without respecting the 256M default limit (reproduced only internally but I don't want to take a risk). Only netdata-ui is concerned. If you are using netdata through XO, then there's no risk for your hosts. Now netdata will only store 1h of data in RAM, nothing on disk.

    As usual: https://github.com/xcp-ng/xcp/wiki/Updates-Howto


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