nixos/profiles/systems/zfs.nix

   1 { pkgs, lib, config, ... }:
   2 {
   3 # none is the recommended elevator with ZFS (which has its own I/O scheduler)
   4 # and/or for SSD, whereas HDD could use mq-deadline.
   5 services.udev.extraRules = ''
   6   # set none scheduler for non-rotating disks
   7   ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="none"
   8   ACTION=="add|change", KERNEL=="nvme[0-9]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="none"
   9 '';
  10
  11 boot.supportedFilesystems = [ "zfs" ];
  12
  13 # Ensure extra safeguards are active that zfs uses to protect zfs pools.
  14 boot.zfs.forceImportAll  = false;
  15 boot.zfs.forceImportRoot = false;
  16
  17 boot.zfs.enableUnstable = true;
  18 boot.zfs.requestEncryptionCredentials = true;
  19
  20 # Enables periodic scrubbing of ZFS pools.
  21 services.zfs.autoScrub.enable = true;
  22
  23 environment.systemPackages = [
  24   pkgs.mbuffer
  25   pkgs.zfs
  26 ];
  27 }