nixos/profiles/zfs.nix

   1 { pkgs, lib, 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     ACTION=="add|change", KERNEL=="sd[a-z]*[0-9]*|mmcblk[0-9]*p[0-9]*|nvme[0-9]*n[0-9]*p[0-9]*", ENV{ID_FS_TYPE}=="zfs_member", ATTR{../queue/scheduler}="none"
   7     ACTION=="add|change", KERNEL=="sd[a-z][0-9]*", ATTR{../queue/rotational}=="0", ATTR{../queue/scheduler}="none"
   8     ACTION=="add|change", KERNEL=="nvme[0-9]*n[0-9]*p[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   services.zfs.autoScrub.interval = "Sun *-*-08..14 00:15:00";
  29
  30   # According to zpool(8), for consumer hardware
  31   # periodic manual TRIM is preferred over the automatic TRIM
  32   # that ZFS implements.
  33   services.zfs.trim.enable = true;
  34   services.zfs.trim.interval = "Sun *-*-01..07 00:15:00";
  35
  36   environment.systemPackages = [
  37     pkgs.lzop # For remote syncoid
  38     pkgs.mbuffer # For remote syncoid
  39     pkgs.sanoid
  40   ];
  41 }