{ pkgs, lib, config, ... }:
{
# The 32-bit host id of the machine, formatted as 8 hexadecimal characters.
# You should try to make this id unique among your machines.
# Manually generated with : head -c4 /dev/urandom | od -A none -t x4 | cut -d ' ' -f 2
networking.hostId = "69c40b03";

# none is the recommended elevator with ZFS (which has its own I/O scheduler)
# and/or for SSD, whereas HDD could use mq-deadline.
services.udev.extraRules = ''
  # set none scheduler for non-rotating disks
  ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="none"
'';

boot.supportedFilesystems = [ "zfs" ];

# Ensure extra safeguards are active that zfs uses to protect zfs pools.
boot.zfs.forceImportAll  = false;
boot.zfs.forceImportRoot = false;

boot.zfs.enableUnstable = true;
boot.zfs.requestEncryptionCredentials = true;

# Enables periodic scrubbing of ZFS pools.
services.zfs.autoScrub.enable = true;

environment = {
  systemPackages = [
    pkgs.mbuffer
    pkgs.zfs
  ];
};
}