nixos-anywhere-example/template/disk-configs/zfs.nix

{
  networking.hostId = "8425e349"; # needed for ZFS

  disko.devices = {
    disk = {
      disk1 = {
        type = "disk";
        device = "/dev/nvme0n1";
        content = {
          type = "gpt";
          partitions = {
            boot = {
              size = "1M";
              type = "EF02"; # for grub MBR
            };
            ESP = {
              size = "500M";
              type = "EF00";
              content = {
                type = "mdraid";
                name = "boot";
              };
            };
            zfs = {
              size = "100%";
              content = {
                type = "zfs";
                pool = "zroot";
              };
            };
          };
        };
      };
      disk2 = {
        type = "disk";
        device = "/dev/nvme1n1";
        content = {
          type = "gpt";
          partitions = {
            boot = {
              size = "1M";
              type = "EF02"; # for grub MBR
            };
            ESP = {
              size = "500M";
              type = "EF00";
              content = {
                type = "mdraid";
                name = "boot";
              };
            };
            zfs = {
              size = "100%";
              content = {
                type = "zfs";
                pool = "zroot";
              };
            };
          };
        };
      };
    };
    zpool = {
      zroot = {
        type = "zpool";
        mode = "mirror";
        rootFsOptions = {
          compression = "lz4";
          "com.sun:auto-snapshot" = "true";
        };
        rootFsOptions = {
          mountpoint = "none";
        };

        datasets = {
          "root" = {
            type = "zfs_fs";
            mountpoint = null;
          };
          "root/nixos" = {
            type = "zfs_fs";
            mountpoint = "/";
          };
          "root/home" = {
            type = "zfs_fs";
            mountpoint = "/home";
          };
        };
      };
    };

    mdadm = {
      boot = {
        type = "mdadm";
        level = 1;
        metadata = "1.0";
        content = {
          type = "filesystem";
          format = "vfat";
          mountpoint = "/boot";
        };
      };
    };
  };
}