[Nix-dev] how to set the prefered IO scheduler for a disk on nixos ?

[Peter Simons]

Hi Azul,

I use the following configuration.nix snippet:

  systemd.services.set-io-scheduler = {
    description = "Configure I/O Scheduler";
    wantedBy = [ "multi-user.target" ];
    unitConfig.RequiresMountsFor = "/sys/block/sda/queue";
    serviceConfig = {
      Type = "oneshot";
      RemainAfterExit = true;
      ExecStart = "${pkgs.stdenv.shell} -c 'echo deadline >/sys/block/sda/queue/scheduler'";
    };
  };

Best regards,
Peter