diff --git a/mini/hardware-configuration.nix b/mini/hardware-configuration.nix
index b9a2ac5..69d8a69 100644
--- a/mini/hardware-configuration.nix
+++ b/mini/hardware-configuration.nix
@@ -24,8 +24,7 @@
     neededForBoot = true;
   };
 
-  # encrypted system - on a md device
-  boot.swraid.enable = true;
+  # encrypted system
   boot.initrd.luks.devices."crypt-system" = {
     device = "/dev/disk/by-uuid/565695e2-a09b-412b-9f26-4da10402b967";
     allowDiscards = true;
diff --git a/share/common.nix b/share/common.nix
index bf1d577..6b20bdd 100644
--- a/share/common.nix
+++ b/share/common.nix
@@ -26,6 +26,12 @@ in
   # use the latest kernel
   boot.kernelPackages = pkgs.linuxPackages_latest;
 
+  # allow md devices
+  boot.swraid.enable = true;
+  boot.swraid.mdadmConf = ''
+    MAILADDR=christoph@cullmann.io
+  '';
+
   # my kernel parameters
   boot.kernelParams = [
     # don't check for split locks, for KVM and Co.