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    Reducing vCPU isn't done live on Windows

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    • J
      jr-m4
      last edited by

      I'm doing a couple of tests to trying to figure out quirks and behaviours from XCP-ng side, for a future production (licensed) setup.

      So I tried to see what would happen if I would play with the number of vCPUs on two guests.
      TL;DR: Reducing vCPUs on Windows requires reboot.

      On Windows Guest:
      OS: Windows Server 25
      Guest Agent: 9.2.385.0
      Increasing the number of vCPUs up to the max value, is done live and works well. But reducing the vCPUs requires a reboot.

      However. On a Rocky Linux 10 installation. The reducing works immediately live and online as expected.

      This might very well be a limitation of how Windows does things internally. But I thought it interesting enouch to report about anyway.

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      • poddingueP poddingue marked this topic as a question
      • D
        dinhngtu Vates 🪐 XCP-ng Team
        last edited by

        Hello,

        Windows only supports adding CPUs but not removing them.

        This is a Windows limitation.

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        • J jr-m4 has marked this topic as solved
        • J
          jr-m4 @dinhngtu
          last edited by

          @dinhngtu said:

          Hello,

          Windows only supports adding CPUs but not removing them.

          This is a Windows limitation.

          I'm not surprised by that limitation. Thanks for confirming anyway.

          Cheers!

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          • olivierlambertO
            olivierlambert Vates 🪐 Co-Founder CEO
            last edited by

            I wasn't even aware about this being a Windows limitation by itself 🙂

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