phase 2: move host files to hosts/{mreow,yarn,muffin}/

legacy/server-config/modules/hardware.nix

@@ -1,62 +0,0 @@
-{
-  config,
-  lib,
-  pkgs,
-  service_configs,
-  ...
-}:
-let
-  hddTuneIosched = pkgs.writeShellScript "hdd-tune-iosched" ''
-    # Called by udev with the partition kernel name (e.g. sdb1).
-    # Derives the parent disk and applies mq-deadline iosched params.
-    parent=''${1%%[0-9]*}
-    dev="/sys/block/$parent"
-    [ -d "$dev/queue/iosched" ] || exit 0
-    echo 500 > "$dev/queue/iosched/read_expire"
-    echo 15000 > "$dev/queue/iosched/write_expire"
-    echo 128 > "$dev/queue/iosched/fifo_batch"
-    echo 16 > "$dev/queue/iosched/writes_starved"
-    echo 4096 > "$dev/queue/max_sectors_kb" 2>/dev/null || true
-  '';
-in
-{
-  boot.initrd.availableKernelModules = [
-    "xhci_pci"
-    "ahci"
-    "usb_storage"
-    "usbhid"
-    "sd_mod"
-  ];
-  boot.initrd.kernelModules = [ "dm-snapshot" ];
-  boot.kernelModules = [ "kvm-amd" ];
-  boot.extraModulePackages = [ ];
-
-  swapDevices = [ ];
-
-  hardware.cpu.amd.updateMicrocode = true;
-  hardware.enableRedistributableFirmware = true;
-
-  # HDD I/O tuning for torrent seeding workload (high-concurrency random reads)
-  # sharing the pool with latency-sensitive sequential reads (Jellyfin playback).
-  #
-  # mq-deadline sorts requests into elevator sweeps, reducing seek distance.
-  # read_expire=500ms keeps reads bounded so a Jellyfin segment can't queue for
-  # seconds behind a torrent burst; write_expire=15s lets the scheduler batch
-  # writes for coalescence (torrent writes are async and tolerate delay).
-  # The bulk of read coalescence already happens above the scheduler via ZFS
-  # aggregation (zfs_vdev_aggregation_limit=4M, read_gap_limit=128K,
-  # async_read_max=32), so the scheduler deadline only needs to be large enough
-  # to keep the elevator sweep coherent -- 500ms is plenty on rotational disks.
-  # fifo_batch=128 keeps sweeps long; writes_starved=16 heavily favors reads.
-  # 4 MiB readahead matches libtorrent piece extent affinity for sequential prefetch.
-  #
-  # The NixOS ZFS module hardcodes a udev rule that forces scheduler="none" on all
-  # ZFS member partitions' parent disks (on both add AND change events). We counter
-  # it with lib.mkAfter so our rule appears after theirs in 99-local.rules — our
-  # rule matches the same partition events and sets mq-deadline back, then a RUN
-  # script applies the iosched params. Only targets rotational, non-removable disks
-  # (i.e. HDDs, not SSDs or USB).
-  services.udev.extraRules = lib.mkAfter ''
-    ACTION=="add|change", KERNEL=="sd[a-z]*[0-9]*", ENV{ID_FS_TYPE}=="zfs_member", ATTR{../queue/rotational}=="1", ATTR{../removable}=="0", ATTR{../queue/scheduler}="mq-deadline", ATTR{../queue/read_ahead_kb}="4096", ATTR{../queue/nr_requests}="512", RUN+="${hddTuneIosched} %k"
-  '';
-}

legacy/server-config/modules/home.nix

@@ -1,31 +0,0 @@
-{
-  pkgs,
-  lib,
-  ...
-}:
-{
-  home.stateVersion = "24.11";
-  programs.fish = {
-    enable = true;
-
-    interactiveShellInit = ''
-      # disable greeting
-      set fish_greeting
-
-      # pfetch on shell start (disable pkgs because of execution time)
-      PF_INFO="ascii title os host kernel uptime memory editor wm" ${lib.getExe pkgs.pfetch-rs}
-    '';
-
-    shellAliases =
-      let
-        eza = "${lib.getExe pkgs.eza} --color=always --group-directories-first";
-      in
-      {
-        # from DistroTube's dot files: Changing "ls" to "eza"
-        ls = "${eza} -al";
-        la = "${eza} -a";
-        ll = "${eza} -l";
-        lt = "${eza} -aT";
-      };
-  };
-}