nixos/profiles/zfs.nix

   1 { pkgs, lib, config, hostName, ... }:
   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 boot.initrd.supportedFilesystems = [ "zfs" ];
  13 boot.zfs.requestEncryptionCredentials = lib.mkDefault [ hostName ];
  14
  15 # Using ZFS together with hibernation (suspend to disk)
  16 # may cause filesystem corruption.
  17 # See https://github.com/openzfs/zfs/issues/260
  18 boot.kernelParams = [ "nohibernate" ];
  19
  20 # Ensure extra safeguards are active that zfs uses to protect zfs pools.
  21 boot.zfs.forceImportAll  = false;
  22 boot.zfs.forceImportRoot = false;
  23
  24 boot.zfs.enableUnstable = false;
  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 environment.systemPackages = [
  35   pkgs.sanoid
  36 ];
  37 }