règles pour les SSD

public/public.nix

@@ -18,6 +18,7 @@ in
     ./service-haveged.nix
     ./service-monitoring.nix
     ./service-ssh.nix
+    ./udev.nix
 
     # commandées par config-generator
     ## option de configuration spécifique

public/udev.nix

@@ -0,0 +1,18 @@
+{ config, lib, pkgs, ... }:
+
+let
+  inherit (lib) mkIf mkMerge mkThenElse;
+  cfg = config.r6d.config-generator;
+  computers = config.r6d.computers;
+  profiles = config.r6d.profiles;
+in
+
+{
+  # Définition du IO Scheduler pour les SSD
+  services.udev.extraRules = ''
+  # set deadline scheduler for non-rotating disks
+  # according to https://wiki.debian.org/SSDOptimization, deadline is preferred over noop
+  ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="deadline"
+  '';
+
+}