{
  disko.devices = {
    disk = {
      x = {
        type = "disk";
        device = "/dev/sdx";
        content = {
          type = "gpt";
          partitions = {
            ESP = {
              size = "64M";
              type = "EF00";
              content = {
                type = "filesystem";
                format = "vfat";
                mountpoint = "/boot";
                mountOptions = [ "umask=0077" ];
              };
            };
            zfs = {
              size = "100%";
              content = {
                type = "zfs";
                pool = "zroot";
              };
            };
          };
        };
      };
      y = {
        type = "disk";
        device = "/dev/sdy";
        content = {
          type = "gpt";
          partitions = {
            zfs = {
              size = "100%";
              content = {
                type = "zfs";
                pool = "zroot";
              };
            };
          };
        };
      };
      z = {
        type = "disk";
        device = "/dev/sdz";
        content = {
          type = "gpt";
          partitions = {
            zfs = {
              size = "100%";
              content = {
                type = "zfs";
                pool = "zroot";
              };
            };
          };
        };
      };
      cache = {
        type = "disk";
        device = "/dev/vdc";
        content = {
          type = "gpt";
          partitions = {
            zfs = {
              size = "100%";
              content = {
                type = "zfs";
                pool = "zroot";
              };
            };
          };
        };
      };
    };
    zpool = {
      zroot = {
        type = "zpool";
        mode = {
          topology = {
            type = "topology";
            vdev = [
              {
                mode = "mirror";
                members = [
                  "x"
                  "y"
                ];
              }
            ];
            special = {
              members = [ "z" ];
            };
            cache = [ "cache" ];
          };
        };

        rootFsOptions = {
          compression = "zstd";
          "com.sun:auto-snapshot" = "false";
        };
        mountpoint = "/";
        datasets = {
          # See examples/zfs.nix for more comprehensive usage.
          zfs_fs = {
            type = "zfs_fs";
            mountpoint = "/zfs_fs";
            options."com.sun:auto-snapshot" = "true";
          };
        };
      };
    };
  };
}