Hm... between two vms, that shouldn't be an issue if networking.hostId is the same for both.

For diskoImagesScript i believe the idea would be that it runs zfs export in the end which also should cause it to import cleanly on another system iiuc.

The PR got merged 🎉 (thanks for your UUID contribution, btw), but I couldn't quite get subvolumes to mount at boot time.

I saw that your PR included code for a custom systemd unit. I haven't tried using that and haven't much experience with writing systemd units, so maybe you could try implementing something with it to get boot-time subvolume mounts to work, if you're interested?

      disko.nixosModules.disko
      {
        disko.devices = {
          main = {
            type = "disk";
            device = "/dev/vdb";
            content = {
              type = "gpt";
              partitions = {
                # Legacy BIOS, MBR-style partition table.
                boot = {
                  size = "1M";
                  type = "EF02"; # Grub MBR.
                };

                # The LUKS-encrypted root.
                luks = {
                  size = "300G";
                  content = {
                    type = "luks";
                    name = "crypted";

                    # Set up with an interactive password and not a keyfile.
                    settings = {
                      allowDiscards = true;
                    };

                    # The Btrfs filesystem.
                    content = {
                      type = "btrfs";
                      extraArgs = ["-f"]; # Overwrite any existing file system.
                      subvolumes = {
                        "/root" = {
                          mountpoint = "/";
                          mountOptions = [
                            "compress=zstd"
                            "noatime"
                          ];
                        };

                        # The home subvolume.
                        "/home" = {
                          mountpoint = "/home";                          
                          mountOptions = [
                            "compress=zstd"
                            "noatime"
                          ];
                        };

                        # The nix subvolume.
                        "/nix" = {
                          mountpoint = "/nix";                          
                          mountOptions = [
                            "compress=zstd"
                            "noatime"
                          ];
                        };
                      };
                    };
                  };
                };
              };