home/hosts/odin/system.nix

{ config, ... }:
{
  # Boot configuration
  boot = {
    # Use systemd-boot for UEFI systems
    loader.systemd-boot.enable = true;
    loader.efi.canTouchEfiVariables = true;
    loader.grub.devices = [
      config.disko.devices.disk.main.device
    ];
    loader.timeout = 3;

    # Kernel parameters for server workload
    kernelParams = [ "rootflags=compress=zstd:1,noatime" ];
    kernelModules = [ "nct6775" ];

    # Enable KSM for memory efficiency with containers
    kernel.sysctl = {
      "kernel.sysrq" = 1;
      "vm.swappiness" = 10;
      "net.core.default_qdisc" = "cake";
    };
  };

  hardware.fancontrol = {
    enable = true;
    config = ''
      INTERVAL=10
      DEVPATH=hwmon1=devices/pci0000:00/0000:00:02.2/0000:04:00.0/nvme/nvme0 hwmon2=devices/platform/nct6775.656
      DEVNAME=hwmon1=nvme hwmon2=nct6798
      FCTEMPS=hwmon2/pwm7=hwmon1/temp1_input hwmon2/pwm2=hwmon1/temp1_input
      FCFANS=hwmon2/pwm7=hwmon2/fan7_input hwmon2/pwm2=hwmon2/fan2_input
      MINTEMP=hwmon2/pwm7=30 hwmon2/pwm2=30
      MAXTEMP=hwmon2/pwm7=60 hwmon2/pwm2=60
      MINSTART=hwmon2/pwm7=95 hwmon2/pwm2=150
      MINSTOP=hwmon2/pwm7=75 hwmon2/pwm2=0
    '';
  };

  services.hddfancontrol.enable = true;
  services.hddfancontrol.settings = {
    harddrives =
      let
        devices = config.disko.devices.disk;
      in
      {
        disks = [
          devices.parity1.device
          devices.data1.device
          devices.data2.device
        ];
        pwmPaths = [
          "/sys/class/hwmon/hwmon2/pwm1:20:0"
          "/sys/class/hwmon/hwmon2/pwm4:80:60"
        ];
        logVerbosity = "DEBUG";
        extraArgs = [
          "--min-fan-speed-prct=0"
        ];
      };
  };

  # Btrfs maintenance
  services.btrfs.autoScrub = {
    enable = true;
    interval = "monthly";
    fileSystems = [ "/" ];
  };
}