add nfss host

flake.nix

@@ -62,6 +62,15 @@
       ];
     };
 
+    nixosConfigurations."nfss" = nixpkgs.lib.nixosSystem {
+      system = "x86_64-linux";
+      modules = [
+        disko.nixosModules.disko
+        ./hosts/nixos/nfss/system.nix
+        ./hosts/nixos/nfss/disk-config.nix
+      ];
+    };
+
     homeConfigurations = {
       "yanlin@macbook" = home-manager.lib.homeManagerConfiguration {
         pkgs = nixpkgs.legacyPackages.aarch64-darwin;
@@ -92,6 +101,12 @@
         modules = [ ./hosts/nixos/thinkpad/home.nix ];
         extraSpecialArgs = { inherit claude-code nixvim firefox-addons; };
       };
+
+      "yanlin@nfss" = home-manager.lib.homeManagerConfiguration {
+        pkgs = nixpkgs.legacyPackages.x86_64-linux;
+        modules = [ ./hosts/nixos/nfss/home.nix ];
+        extraSpecialArgs = { inherit claude-code nixvim; };
+      };
     };
   };
 }

hosts/nixos/nfss/disk-config.nix

@@ -0,0 +1,137 @@
+{
+  disko.devices = {
+    disk = {
+      # First drive of ZFS mirror pair (ZHITAI 1TB #1)
+      main1 = {
+        type = "disk";
+        device = "/dev/disk/by-id/ata-ZHITAI_SC001_XT_1000GB_ZTB401TAB244431J4R";
+        content = {
+          type = "gpt";
+          partitions = {
+            # GRUB BIOS boot partition
+            boot = {
+              size = "1M";
+              type = "EF02";
+            };
+            # EFI System Partition (mirrored manually)
+            esp1 = {
+              size = "500M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+                mountOptions = [ "umask=0077" ];
+              };
+            };
+            # ZFS partition
+            zfs = {
+              size = "100%";
+              content = {
+                type = "zfs";
+                pool = "rpool";
+              };
+            };
+          };
+        };
+      };
+
+      # Second drive of ZFS mirror pair (ZHITAI 1TB #2)
+      main2 = {
+        type = "disk";
+        device = "/dev/disk/by-id/ata-ZHITAI_SC001_XT_1000GB_ZTB401TAB244431KEG";
+        content = {
+          type = "gpt";
+          partitions = {
+            # GRUB BIOS boot partition
+            boot = {
+              size = "1M";
+              type = "EF02";
+            };
+            # EFI System Partition (backup)
+            esp2 = {
+              size = "500M";
+              type = "EF00";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+              };
+            };
+            # ZFS partition
+            zfs = {
+              size = "100%";
+              content = {
+                type = "zfs";
+                pool = "rpool";
+              };
+            };
+          };
+        };
+      };
+
+    };
+
+    zpool = {
+      rpool = {
+        type = "zpool";
+        mode = "mirror";
+        rootFsOptions = {
+          compression = "lz4";
+          acltype = "posixacl";
+          xattr = "sa";
+          relatime = "on";
+          normalization = "formD";
+          canmount = "off";
+          dnodesize = "auto";
+        };
+        mountpoint = "/";
+
+        datasets = {
+          # Root dataset
+          root = {
+            type = "zfs_fs";
+            options = {
+              canmount = "off";
+              mountpoint = "none";
+            };
+          };
+
+          # Root filesystem
+          "root/nixos" = {
+            type = "zfs_fs";
+            mountpoint = "/";
+            options = {
+              canmount = "noauto";
+              mountpoint = "/";
+              "com.sun:auto-snapshot" = "true";
+            };
+          };
+
+          # Home directory
+          "root/home" = {
+            type = "zfs_fs";
+            mountpoint = "/home";
+            options = {
+              canmount = "on";
+              mountpoint = "/home";
+              "com.sun:auto-snapshot" = "true";
+            };
+          };
+
+          # Nix store (no snapshots needed)
+          "root/nix" = {
+            type = "zfs_fs";
+            mountpoint = "/nix";
+            options = {
+              canmount = "on";
+              mountpoint = "/nix";
+              "com.sun:auto-snapshot" = "false";
+            };
+          };
+        };
+      };
+
+    };
+
+  };
+}

hosts/nixos/nfss/hardware-configuration.nix

@@ -0,0 +1,38 @@
+# Hardware configuration for nfss (nix-based full ssd server)
+# Same hardware as hs - generated by nixos-generate-config
+
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];
+
+  # Boot configuration - detected kernel modules for this hardware
+  boot.initrd.availableKernelModules = [
+    "xhci_pci"
+    "ahci"
+    "usb_storage"
+    "sd_mod"
+    "sdhci_pci"
+  ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  # ZFS filesystems are managed by disko configuration
+  # No filesystem declarations needed here - disko handles all mounts
+
+  # No swap devices configured
+  swapDevices = [ ];
+
+  # Networking hardware
+  networking.useDHCP = lib.mkDefault true;
+
+  # Hardware-specific settings
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+
+  # CPU microcode updates
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+
+  # Enable firmware updates
+  hardware.enableRedistributableFirmware = lib.mkDefault true;
+}

hosts/nixos/nfss/home.nix

@@ -0,0 +1,13 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    ../home-default.nix
+    ../../../modules/tex.nix
+    ../../../modules/schedule.nix
+  ];
+
+  home.packages = with pkgs; [
+  ];
+
+}

hosts/nixos/nfss/system.nix

@@ -0,0 +1,122 @@
+{ config, pkgs, ... }: {
+  imports = [
+    ./hardware-configuration.nix
+    ../system-default.nix
+    ../../../modules/login-display.nix
+  ];
+
+  # GRUB bootloader with ZFS support
+  boot.loader.grub = {
+    enable = true;
+    devices = [
+      "/dev/disk/by-id/ata-ZHITAI_SC001_XT_1000GB_ZTB401TAB244431J4R"
+      "/dev/disk/by-id/ata-ZHITAI_SC001_XT_1000GB_ZTB401TAB244431KEG"
+    ]; # Install GRUB on both ZFS mirror drives
+    efiSupport = true;
+    efiInstallAsRemovable = true;
+    zfsSupport = true;
+  };
+
+  # Disable systemd stage-1 (use traditional initrd for ZFS compatibility)
+  boot.initrd.systemd.enable = false;
+  boot.supportedFilesystems = [ "zfs" ];
+  boot.zfs.forceImportRoot = false;
+
+  # ZFS ARC memory configuration for 32GB system
+  boot.kernelParams = [
+    "zfs.zfs_arc_max=17179869184"  # 16GB max ARC size
+    "zfs.zfs_arc_min=2147483648"   # 2GB min ARC size
+  ];
+
+  # Network configuration
+  networking = {
+    hostName = "nfss";
+    hostId = "8425e349"; # Required for ZFS
+    networkmanager.enable = true;
+    firewall = { enable = false; };
+  };
+
+  # Host-specific SSH configuration
+  services.openssh = {
+    settings = {
+      PermitRootLogin = "yes";
+    };
+    openFirewall = true;
+  };
+
+  # Define a user account
+  users.users.root = {
+    hashedPassword = null;
+    hashedPasswordFile = null;
+    password = null;
+    initialHashedPassword = null;
+    initialPassword = null;
+    openssh.authorizedKeys.keys = [
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIG35m0DgTrEOAM+1wAlYZ8mvLelNTcx65cFccGPQcxmo yanlin@imac"
+    ];
+  };
+
+  # Host-specific user configuration
+  users.users.yanlin = {
+    extraGroups = [ "networkmanager" "wheel" ];
+    hashedPassword = "$6$8NUV0JK33hs3XBYe$osnYKzENDLYHQEpj8Z5F6ECpLdc8Y3RZcVGxQ0bc/6DepTwugAkfX8h6ItI01dJyk8RstiGsWVVCKGwXaL.sN.";
+    openssh.authorizedKeys.keys = [
+      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIG35m0DgTrEOAM+1wAlYZ8mvLelNTcx65cFccGPQcxmo yanlin@imac"
+    ];
+  };
+
+  # Intel graphics for hardware acceleration (QSV/VA-API)
+  hardware.graphics = {
+    enable = true;
+    extraPackages = with pkgs; [
+      intel-media-driver
+      intel-vaapi-driver
+      libva-vdpau-driver
+      libvdpau-va-gl
+      vpl-gpu-rt
+      intel-compute-runtime
+    ];
+  };
+
+  # Host-specific packages
+  environment.systemPackages = with pkgs; [
+    smartmontools
+    zfs
+    intel-gpu-tools
+  ];
+
+  # ZFS services configuration
+  services.zfs = {
+    autoScrub = {
+      enable = true;
+      interval = "monthly";
+      pools = [ "rpool" ];
+    };
+    autoSnapshot = {
+      enable = true;
+      frequent = 4;
+      hourly = 24;
+      daily = 7;
+      weekly = 4;
+      monthly = 12;
+    };
+    trim = {
+      enable = true;
+      interval = "weekly";
+    };
+  };
+
+  # Login display with SMART disk health status
+  services.login-display = {
+    enable = true;
+    showSystemInfo = true;
+    showSmartStatus = true;
+    smartDrives = {
+      "/dev/disk/by-id/ata-ZHITAI_SC001_XT_1000GB_ZTB401TAB244431J4R" = "ZFS_Mirror_1";
+      "/dev/disk/by-id/ata-ZHITAI_SC001_XT_1000GB_ZTB401TAB244431KEG" = "ZFS_Mirror_2";
+    };
+    showDiskUsage = true;
+    diskUsagePaths = [ "/" "/home/" ];
+  };
+
+}