servers/mermet/zfs.nix

   1 { pkgs, lib, config, ... }:
   2
   3 {
   4   imports = [];
   5
   6   boot.supportedFilesystems = [ "zfs" ];
   7
   8   # The 32-bit host id of the machine, formatted as 8 hexadecimal characters.
   9   # You should try to make this id unique among your machines.
  10   # Manually generated with : head -c4 /dev/urandom | od -A none -t x4 | cut -d ' ' -f 2
  11   networking.hostId = "69c40b03";
  12
  13   # none is the recommended elevator with ZFS (which has its own I/O scheduler)
  14   # and/or for SSD, whereas HDD could use mq-deadline.
  15   services.udev.extraRules = ''
  16     # set none scheduler for non-rotating disks
  17     ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="none"
  18   '';
  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 = true;
  25   boot.zfs.requestEncryptionCredentials = true;
  26
  27   # Enables periodic scrubbing of ZFS pools.
  28   services.zfs.autoScrub.enable = true;
  29
  30   environment = {
  31     systemPackages = [
  32       pkgs.mbuffer
  33       pkgs.zfs
  34     ];
  35   };
  36
  37   /*
  38   # Enable the (OpenSolaris-compatible) ZFS auto-snapshotting service.
  39   services.zfs.autoSnapshot = {
  40     enable   = true;
  41     frequent = ;
  42     hourly   = ;
  43     daily    = ;
  44     weekly   = ;
  45     monthly  = ;
  46   };
  47   */
  48
  49   /*
  50   fileSystems."/boot" =
  51     { device = "bpool/boot";
  52       fsType = "zfs";
  53     };
  54   */
  55   fileSystems."/" =
  56     { device = "rpool/root";
  57       fsType = "zfs";
  58     };
  59
  60   fileSystems."/home" =
  61     { device = "rpool/home";
  62       fsType = "zfs";
  63     };
  64
  65   fileSystems."/nix" =
  66     { device = "rpool/nix";
  67       fsType = "zfs";
  68     };
  69
  70   fileSystems."/var" =
  71     { device = "rpool/var";
  72       fsType = "zfs";
  73     };
  74
  75   fileSystems."/var/cache" =
  76     { device = "rpool/var/cache";
  77       fsType = "zfs";
  78     };
  79
  80   fileSystems."/var/log" =
  81     { device = "rpool/var/log";
  82       fsType = "zfs";
  83     };
  84
  85   fileSystems."/var/mail" =
  86     { device = "rpool/var/mail";
  87       fsType = "zfs";
  88     };
  89
  90   fileSystems."/var/tmp" =
  91     { device = "rpool/var/tmp";
  92       fsType = "zfs";
  93     };
  94
  95   fileSystems."/var/www" =
  96     { device = "rpool/var/www";
  97       fsType = "zfs";
  98     };
  99 }