1 { pkgs, lib, config, hostName, ... }:
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"
11 boot.supportedFilesystems = [ "zfs" ];
12 boot.initrd.supportedFilesystems = [ "zfs" ];
13 boot.zfs.requestEncryptionCredentials = lib.mkDefault [ hostName ];
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" ];
20 # Ensure extra safeguards are active that zfs uses to protect zfs pools.
21 boot.zfs.forceImportAll = false;
22 boot.zfs.forceImportRoot = false;
24 boot.zfs.enableUnstable = false;
26 # Enables periodic scrubbing of ZFS pools.
27 services.zfs.autoScrub.enable = true;
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;
34 environment.systemPackages = [