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    Is Cold Migration of VMs from XCP-ng 8.3 back to 8.2.1 Not Supported?

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    • K Offline
      Kajetan321
      last edited by

      I’m trying out XCP-ng 8.3. I moved a VM from a host running XCP-ng 8.2.1 to XCP-ng 8.3, that went just fine. Now I powered off the VM and I’m trying to move the VM back to the 8.2.1 host but I’m getting:

      VM_HOST_INCOMPATIBLE_VERSION_MIGRATE

      Is going back no supported?

      1 Reply Last reply Reply Quote 0
      • DanpD Offline
        Danp Pro Support Team
        last edited by

        Hi,

        Migrating from a higher release to a lower release of XCP-ng is not supported. However, there are a couple of ways to accomplish this --

        • Manually export / import the VM
        • Warm migration via XOA -- https://xen-orchestra.com/blog/warm-migration-with-xen-orchestra/
        • Use a CR backup to replicate the VM

        Regards,

        Dan

        1 Reply Last reply Reply Quote 0
        • olivierlambertO Offline
          olivierlambert Vates 🪐 Co-Founder CEO
          last edited by

          And this is a core principle for many things: that's why you migrate the master first and why you cannot migrate a VM on a more up-to-date host to an older one (not just between releases but also XCP-ng updates). As Dan said, there's workarounds but always keep that in mind that's by design. The reverse is different: you can always migrate from older to newer.

          andrewperryA 1 Reply Last reply Reply Quote 0
          • andrewperryA Offline
            andrewperry @olivierlambert
            last edited by

            @olivierlambert this is a concern for me with moving to 8.3 - having a bunch of VMs just migrated from Xen with PV. I understand 8.3 doesn’t support PV and potentially some older operating systems. Will there be a page of supported OS / Distribution versions or have I just not looked hard enough for one that’s already there?

            stormiS 1 Reply Last reply Reply Quote 0
            • olivierlambertO Offline
              olivierlambert Vates 🪐 Co-Founder CEO
              last edited by

              There's no issue with "old OS" as long as they are HVM guests 🙂 If your guests are HVM, there's almost 100% chances it will work. You can use warm migration to do all your tests safely (by ticking "keep the original VM").

              1 Reply Last reply Reply Quote 1
              • stormiS Offline
                stormi Vates 🪐 XCP-ng Team @andrewperry
                last edited by

                @andrewperry The release notes warn about PV guests.

                1 Reply Last reply Reply Quote 0

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