zfs auto expand, scrub, and trim

nixos/hosts/varda/default.nix

@@ -1,5 +1,8 @@
-{ pkgs, config, ... }:
 {
+  pkgs,
+  config,
+  ...
+}: {
   imports = [./resources/prune-backup.nix];
 
   networking.hostId = "cdab8473";
@@ -30,11 +33,9 @@
       device = "//u370253-sub2.your-storagebox.de/u370253-sub2";
       fsType = "cifs";
 
-      options =
-        let
+      options = let
         automount_opts = "x-systemd.automount,noauto,x-systemd.idle-timeout=60,x-systemd.device-timeout=5s,x-systemd.mount-timeout=5s,user,vers=3";
-        in
-        [
+      in [
         "${automount_opts},credentials=${config.sops.secrets.sambaCredentials.path},uid=994,gid=993" # evaluated and deployed from another machine
       ];
     };
@@ -51,6 +52,14 @@
     };
   };
 
+  services = {
+    zfs = {
+      expandOnBoot = "all";
+      autoScrub.enable = true;
+      trim.enable = true;
+    };
+  };
+
   # System settings and services.
   mySystem = {
     purpose = "Production";