Reorganise hardware vs host config, tidy settings and services

hosts/hardware/FredOS-Mediaserver.nix

@@ -15,14 +15,53 @@
     fsType = "ext4";
   };
 
+  # Individual Data Disks
+  fileSystems."/mnt/disk1" = {
+    device = "/dev/disk/by-uuid/90ae3493-38c1-4473-b409-e9d99c3b315e";
+    fsType = "ext4";
+  };
+
+  fileSystems."/mnt/disk2" = {
+    device = "/dev/disk/by-uuid/7145223e-f285-424a-a114-cb0b1b64e068";
+    fsType = "ext4";
+  };
+
+  fileSystems."/mnt/disk3" = {
+    device = "/dev/disk/by-uuid/58cecfd5-2fd7-4c4b-b3a1-0bf5e9d0beab";
+    fsType = "ext4";
+  };
+
+  fileSystems."/mnt/disk4" = {
+    device = "/dev/disk/by-uuid/317660ef-bd75-4fa4-bd20-f96a3926bf7b";
+    fsType = "ext4";
+  };
+
+  # The Combined MergerFS Pool
+  fileSystems."/mnt/storage" = {
+    device = "/mnt/disk1:/mnt/disk2:/mnt/disk3:/mnt/disk4";
+    fsType = "fuse.mergerfs";
+    options = [
+      "defaults"
+      "allow_other"
+      "use_ino"
+      "cache.files=partial"
+      "dropcacheonclose=true"
+      "category.create=mfs"
+    ];
+  };
+
   swapDevices = [ ];
 
   nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
   hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
-
   networking.hostName = "FredOS-Mediaserver";
 
-  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  boot.loader.grub = {
+    enable = true;
+    # Includes all 4 physical disks for redundancy
+    devices = [ "/dev/sda" "/dev/sdb" "/dev/sdc" "/dev/sdd" "/dev/sde" ];
+    useOSProber = true;
+  };
 
   system.stateVersion = "25.11";
-}
+}