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nix-configuration/modules/system/raid.nix

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{ lib, config, ... }:
let
cfg = config.aux.system.raid;
in
{
options = {
aux.system.raid = {
enable = lib.mkEnableOption "Enables RAID support.";
storage = {
enable = lib.mkEnableOption "Enables support for the storage array.";
mailAddr = lib.mkOption {
default = "";
type = lib.types.str;
description = "Address to email in case of issues.";
example = "admin@example.com";
};
keyFile = lib.mkOption {
default = "";
type = lib.types.str;
description = "Path to the key file to use to auto-unlock the array.";
example = "/home/user/storage.key";
};
};
};
};
config = lib.mkMerge [
(lib.mkIf cfg.enable { boot.swraid.enable = true; })
(lib.mkIf cfg.storage.enable {
aux.system.raid.enable = true;
boot.swraid.mdadmConf = ''
ARRAY /dev/md/Sapana metadata=1.2 UUID=51076daf:efdb34dd:bce48342:3b549fcb
MAILADDR ${cfg.storage.mailAddr}
'';
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# Auto-unlock RAID array with a key file
environment.etc."crypttab" = lib.mkIf (cfg.storage.keyFile != "") {
text = "storage /dev/md/Sapana ${cfg.storage.keyFile} nofail,keyfile-timeout=5s";
};
fileSystems."/storage" = {
device = "/dev/mapper/storage";
# Keep booting even if the array fails to unlock
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options = [ "nofail" ];
};
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# Automatically scrub the array monthly
systemd = {
services."raid-scrub" = {
description = "Periodically scrub RAID volumes for errors.";
serviceConfig = {
Type = "oneshot";
User = "root";
};
script = "echo check > /sys/block/md127/md/sync_action";
};
timers."raid-scrub" = {
description = "Periodically scrub RAID volumes for errors.";
wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar = "monthly";
Persistent = true;
Unit = "raid-scrub.service";
};
};
};
})
];
}