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diff --git a/hosts/by-name/tiamat/legacy-disk-module/module.nix b/hosts/by-name/tiamat/legacy-disk-module/module.nix
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+# nixos-config - My current NixOS configuration
+#
+# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# This file is part of my nixos-config.
+#
+# You should have received a copy of the License along with this program.
+# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
+{
+  config,
+  lib,
+  pkgs,
+  modules,
+  ...
+}: let
+  # FIXME: The iso redeploy requires a bigger efi partition  <2024-05-12>
+  cfg = config.legacy.soispha.disks;
+  defaultMountOptions = [
+    "compress=zstd:3" # This saves disk space, at a performance cost
+    "noatime" # should have some performance upsides, and I don't use it anyways
+    "lazytime" # make time changes in memory
+  ];
+in {
+  options.legacy.soispha.disks = {
+    enable = lib.mkEnableOption "disk setup with disko";
+
+    disk = lib.mkOption {
+      type = lib.types.path;
+      example = lib.literalExpression "/dev/disk/by-uuid/0442cb6d-f13a-4635-b487-fa76189774c5";
+      description = "The disk used for installing the OS.";
+    };
+
+    ssd = lib.mkEnableOption "ssd specific improvements, like trim";
+
+    swap = {
+      uuid = lib.mkOption {
+        type = lib.types.str;
+        example = lib.literalExpression "d1d20ae7-3d8a-44da-86da-677dbbb10c89";
+        description = "The uuid of the swapfile";
+      };
+      resumeOffset = lib.mkOption {
+        type = lib.types.str;
+        example = lib.literalExpression "134324224";
+        description = "The resume offset of the swapfile";
+      };
+    };
+  };
+
+  imports = [
+    modules.disko.nixosModules.default
+  ];
+
+  config = lib.mkIf cfg.enable {
+    systemd = lib.recursiveUpdate (import ./hibernate.nix {inherit pkgs;}) (import ./fstrim.nix {inherit pkgs lib cfg;});
+
+    disko.devices = {
+      disk = {
+        main = {
+          device = cfg.disk;
+          content = {
+            type = "gpt";
+            partitions = {
+              root = {
+                size = "100%";
+                name = "root";
+                content = {
+                  type = "luks";
+                  name = "nixos";
+                  extraOpenArgs = ["--allow-discards"];
+                  content = {
+                    type = "btrfs";
+                    extraArgs = ["-f" "--label nixos"]; # Override existing partitions
+                    subvolumes = {
+                      "nix" = {
+                        mountpoint = "/nix";
+                        mountOptions = defaultMountOptions;
+                      };
+                      "persistent-storage" = {
+                        mountpoint = "/srv";
+                        mountOptions = defaultMountOptions;
+                      };
+                      "persistent-storage@snapshots" = {
+                        mountpoint = "/srv/.snapshots";
+                        mountOptions = defaultMountOptions;
+                      };
+                      "swap" = {
+                        mountpoint = "/swap";
+                        mountOptions = [
+                          "noatime" # should have some performance upsides, and I don't use it anyways
+                          "lazytime" # make time changes in memory
+                        ];
+                      };
+                    };
+                  };
+                };
+              };
+              boot = {
+                type = "EF00";
+                size = "512M";
+                name = "boot";
+                content = {
+                  type = "filesystem";
+                  format = "vfat";
+                  mountpoint = "/boot";
+                };
+              };
+            };
+          };
+        };
+      };
+      nodev = {
+        "/" = {
+          fsType = "tmpfs";
+          mountOptions = ["defaults" "size=25%" "mode=0755"];
+        };
+        "/tmp" = {
+          fsType = "tmpfs";
+          mountOptions = ["defaults" "size=50%" "mode=0755"];
+        };
+        "/nix/var/nix/b" = {
+          fsType = "tmpfs";
+          mountOptions = [
+            "defaults"
+            "noswap" # Otherwise, we might run into io-based slowdowns
+            "size=80%"
+            "mode=0755"
+          ];
+        };
+      };
+    };
+    fileSystems = {
+      "/srv" = {
+        neededForBoot = true;
+      };
+      "/swap" = {
+        neededForBoot = true;
+      };
+    };
+    swapDevices = [
+      #{
+      #        device = "/swap/swapfile";
+      #        priority = 1; # lower than zramSwap, just in case
+      #        # size = 2048; # TODO: can nixos create a btrfs swapfile correctly?
+      #}
+    ];
+    zramSwap = {
+      enable = true;
+      priority = 10; # needs to be higher than hardware-swap
+    };
+    boot = {
+      kernelParams = [
+        "resume_offset=${cfg.swap.resumeOffset}"
+        "zswap.enabled=0" # zswap and zram are not really compatible
+      ];
+      resumeDevice = "/dev/disk/by-uuid/${cfg.swap.uuid}";
+    };
+  };
+}