nix-config/hosts/node/disko.nix

{
  device ? throw "Set this to the disk device, e.g. /dev/nvme0n1",
  device2 ? throw "Set this to the disk device2, e.g. /dev/nvme1n1",
  ...
}: {
  disko.devices = {
    disk = {
      disk1 = {
        type = "disk";
        device = "${device}";
        content = {
          type = "gpt";
          partitions = {
            boot = {
              size = "1M";
              type = "EF02"; # for grub MBR
            };
            mdadm = {
              size = "100%";
              content = {
                type = "mdraid";
                name = "raid0";
              };
            };
          };
        };
      };
      disk2 = {
        type = "disk";
        device = "${device2}";
        content = {
          type = "gpt";
          partitions = {
            boot = {
              size = "1M";
              type = "EF02"; # for grub MBR
            };
            mdadm = {
              size = "100%";
              content = {
                type = "mdraid";
                name = "raid0";
              };
            };
          };
        };
      };
    };
    mdadm = {
      raid0 = {
        type = "mdadm";
        level = 0;
        content = {
          type = "gpt";
          partitions = {
            primary = {
              size = "100%";
              content = {
                type = "filesystem";
                format = "ext4";
                mountpoint = "/";
              };
            };
          };
        };
      };
    };
  };
}