base/zfs.nix

   1 { pkgs, lib, config, ... }:
   2 {
   3 # The 32-bit host id of the machine, formatted as 8 hexadecimal characters.
   4 # You should try to make this id unique among your machines.
   5 # Manually generated with : head -c4 /dev/urandom | od -A none -t x4 | cut -d ' ' -f 2
   6 networking.hostId = "69c40b03";
   7
   8 # none is the recommended elevator with ZFS (which has its own I/O scheduler)
   9 # and/or for SSD, whereas HDD could use mq-deadline.
  10 services.udev.extraRules = ''
  11   # set none scheduler for non-rotating disks
  12   ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="none"
  13 '';
  14
  15 boot.supportedFilesystems = [ "zfs" ];
  16
  17 # Ensure extra safeguards are active that zfs uses to protect zfs pools.
  18 boot.zfs.forceImportAll  = false;
  19 boot.zfs.forceImportRoot = false;
  20
  21 boot.zfs.enableUnstable = true;
  22 boot.zfs.requestEncryptionCredentials = true;
  23
  24 # Enables periodic scrubbing of ZFS pools.
  25 services.zfs.autoScrub.enable = true;
  26
  27 environment = {
  28   systemPackages = [
  29     pkgs.mbuffer
  30     pkgs.zfs
  31   ];
  32 };
  33 }