server.nix/drives.nix

{ lib, pkgs, ... }: {
  environment.systemPackages = with pkgs; [
    mergerfs
    mergerfs-tools
  ];

  fileSystems = {
    "/mnt/seagate-8tb-1" = {
      device = "/dev/disk/by-uuid/94471772-5f7e-4a59-b731-4cac02cb1c86";
      fsType = "btrfs";
      options = [ "nofail" ];
    };
    "/mnt/seagate-8tb-2" = {
      device = "/dev/disk/by-uuid/e970d4e0-8019-4d04-9a23-e89e5c82081d";
      fsType = "btrfs";
      options = [ "nofail" ];
    };
    "/mnt/drive2" = {
      device = "/dev/disk/by-uuid/3203fc16-136f-4b17-b844-7584394ea870"; # 18tb hdd
      fsType = "ext4";
      options = [ "nofail" ];
    };
    "/mnt/drive1" = {
      device = "/dev/disk/by-uuid/23aa13b8-3e1a-4cd7-890d-68a54d8f13fa"; # 16tb hdd
      fsType = "btrfs";
      options = [ "nofail" ];
    };
    "/mnt/media" = rec {
      device = lib.concatStringsSep ":" depends;
      fsType = "fuse.mergerfs";
      depends = [
        "/mnt/drive1/media"
        "/mnt/drive2/media"

        "/mnt/seagate-8tb-1/media"
        "/mnt/seagate-8tb-2/media"
      ];
      options = [
        "cache.files=partial"
        "dropcacheonclose=true"
        "category.create=mfs"
      ];
    };
  };
}