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 # Using ZFS together with hibernation (suspend to disk)
  14 # may cause filesystem corruption.
  15 # See https://github.com/openzfs/zfs/issues/260
  16 boot.kernelParams = [ "nohibernate" ];
  17
  18 # Ensure extra safeguards are active that zfs uses to protect zfs pools.
  19 boot.zfs.forceImportAll  = false;
  20 boot.zfs.forceImportRoot = false;
  21
  22 boot.zfs.enableUnstable = false;
  23 # Can be overrided with a list of specific datasets
  24 boot.zfs.requestEncryptionCredentials = lib.mkDefault true;
  25
  26 # Enables periodic scrubbing of ZFS pools.
  27 services.zfs.autoScrub.enable = true;
  28
  29 # According to zpool(8), for consumer hardware
  30 # periodic manual TRIM is preferred over the automatic TRIM
  31 # that ZFS implements.
  32 services.zfs.trim.enable = true;
  33
  34 # Add tools useful with zfs send/receive
  35 environment.systemPackages = [
  36   pkgs.lzop
  37   pkgs.mbuffer
  38 ];
  39 }