disko/example/zfs-over-legacy.nix

{
  disko.devices = {
    disk = {
      vdb = {
        type = "disk";
        device = "/dev/vdb";
        content = {
          type = "gpt";
          partitions = {
            ESP = {
              size = "500M";
              type = "EF00";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = [
                  "defaults"
                ];
              };
            };
            primary = {
              size = "100%";
              content = {
                type = "filesystem";
                format = "ext4";
                mountpoint = "/";
              };
            };
          };
        };
      };
      vdc = {
        type = "disk";
        device = "/dev/vdc";
        content = {
          type = "zfs";
          pool = "zroot";
        };
      };
    };
    zpool = {
      zroot = {
        type = "zpool";
        datasets = {
          "root" = {
            type = "zfs_fs";
            options.mountpoint = "none";
          };
          "root/zfs_fs" = {
            type = "zfs_fs";
            mountpoint = "/zfs_fs";
            options."com.sun:auto-snapshot" = "true";
          };
        };
      };
    };
  };
}