Add two new servers

hosts/elder/boot/default.nix

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+{ pkgs, ... }:
+{
+  boot = {
+    kernelPackages = pkgs.linuxPackages_hardened;
+    kernelParams = [
+      "amdgpu.si_support=1"
+      "radeon.si_support=0"
+    ];
+    loader.grub.enable = true;
+  };
+}

hosts/elder/default.nix

@@ -0,0 +1,20 @@
+{ ... }:
+{
+  imports = [
+    ./boot
+    ./disko
+    ./filesystems
+    ./hardware
+  ];
+
+  system = {
+    nixos.tags = [ "server" ];
+    stateVersion = "25.05";
+  };
+
+  deployment.targetHost = "570:3651:7f2:c26b:bccd:725b:be00:8a18";
+
+  networking.hostId = "447645a9";
+
+  services.nfs.server.enable = true;
+}

hosts/elder/disko/default.nix

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+{ config, disko, ... }:
+{
+  imports = [ disko.nixosModules.disko ];
+
+  disko.devices = {
+    disk = {
+      "${config.networking.hostName}" = {
+        type = "disk";
+        device = "/dev/sda";
+        content = {
+          type = "gpt";
+          partitions = {
+            boot = {
+              size = "1M";
+              type = "EF02";
+            };
+            ESP = {
+              size = "2G";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            main = {
+              size = "100%";
+              content = {
+                type = "lvm_pv";
+                vg = "${config.networking.hostName}";
+              };
+            };
+          };
+        };
+      };
+    };
+
+    lvm_vg = {
+      "${config.networking.hostName}" = {
+        type = "lvm_vg";
+        lvs = {
+          root = {
+            size = "100%";
+            content = {
+              type = "btrfs";
+              extraArgs = [ "-f" ];
+              subvolumes = {
+                "/root" = {
+                  mountpoint = "/";
+                  mountOptions = [
+                    "compress=zstd"
+                    "ssd"
+                  ];
+                };
+                "/prev" = {
+                  mountpoint = "/prev";
+                  mountOptions = [
+                    "compress=zstd"
+                    "noexec"
+                    "ssd"
+                  ];
+                };
+                "/nix" = {
+                  mountpoint = "/nix";
+                  mountOptions = [
+                    "compress=zstd"
+                    "ssd"
+                  ];
+                };
+
+                # Impermanence
+                "/persist" = {
+                  mountpoint = "/persist";
+                  mountOptions = [ 
+                    "compress=zstd"
+                    "ssd"
+                  ];
+                };
+                "/persist/.snapshots" = { };
+                "/persist/home" = { };
+                "/persist/home/.snapshots" = { };
+              };
+            };
+          };
+          swap = {
+            size = "8G";
+            content = {
+              type = "swap";
+              discardPolicy = "both";
+            };
+          };
+        };
+      };
+    };
+  };
+
+  # Needed for impermanence
+  fileSystems."/persist".neededForBoot = true;
+}

hosts/elder/filesystems/default.nix

@@ -0,0 +1,16 @@
+{ ... }:
+{
+  fileSystems = {
+    "/persist/storage" = {
+      device = "/dev/disk/by-uuid/5c3c533b-1c70-4411-854a-37fa794fc17c";
+      fsType = "btrfs";
+      options = [
+        "nofail"
+        "nosuid"
+        "subvol=storage"
+      ];
+    };
+
+    "elder".enable = false;
+  };
+}

hosts/elder/hardware/default.nix

@@ -0,0 +1,23 @@
+{ modulesPath, ... }:
+{
+  imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];
+
+  boot = {
+    initrd = {
+      availableKernelModules = [
+        "ahci"
+        "ehci_pci"
+        "sd_mod"
+        "sr_mod"
+        "uhci_hcd"
+        "usbhid"
+      ];
+      kernelModules = [ "dm-snapshot" ];
+    };
+    kernelModules = [ "kvm-intel" ];
+  };
+
+  hardware.cpu.intel.updateMicrocode = true;
+
+  nixpkgs.hostPlatform = "x86_64-linux";
+}