Added snapRAID and MergerFS Nix config.

configuration.nix

@@ -1,5 +1,17 @@
 { modulesPath, config, lib, pkgs, inputs, ... }:
 
+let
+  # Create a list of data disk mount points, e.g. [ "/mnt/data-1" "/mnt/data-2" ]
+  dataDisks = lib.lists.catAttrs "mountpoint" (
+    lib.attrsets.filterAttrs (n: v: lib.strings.hasPrefix "data-" n) config.disko.devices.disk
+  );
+
+  # Create a list of parity disk mount points
+  parityDisks = lib.lists.catAttrs "mountpoint" (
+    lib.attrsets.filterAttrs (n: v: lib.strings.hasPrefix "parity-" n) config.disko.devices.disk
+  );
+in
+
 {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
@@ -153,5 +165,36 @@
   # Enable NixOS flakes
   nix.settings.experimental-features = [ "nix-command" "flakes" ];
 
+  # --- Storage Configuration (MergerFS & SnapRAID) ---
+
+  # Create the mount point for the MergerFS pool
+  fileSystems."/mnt/data-storage" = {
+    device = "mergerfs";
+    fsType = "fuse";
+    options = [
+      "defaults"
+      "allow_other"
+      "use_ino"
+      "cache.files=off"
+      "moveonenospc=true"
+      "category.create=mfs"
+      "srcmounts=${lib.strings.concatStringsSep ":" dataDisks}"
+    ];
+  };
+
+  # SnapRAID for data redundancy
+  services.snapraid = {
+    enable = true;
+    content = map (disk: "${disk}/snapraid.content") dataDisks;
+    parity = map (disk: "${disk}/snapraid.parity") parityDisks;
+    data = dataDisks;
+
+    runner = {
+      enable = true;
+      diffAndSyncOn = "04:00"; # Daily at 4am
+      scrubOn = "Sun 05:00";   # Weekly on Sunday at 5am
+    };
+  };
+
   system.stateVersion = "25.05";
 }