diff --git a/common.nix b/common.nix
index 0cd559c..998dd4b 100644
--- a/common.nix
+++ b/common.nix
@@ -36,6 +36,18 @@ in
   services.zfs.autoScrub.enable = true;
   services.zfs.trim.enable = true;
 
+  # persistent nix
+  fileSystems."/nix" = {
+    device = "zroot/nix";
+    fsType = "zfs";
+  };
+
+  # persistent homes
+  fileSystems."/home" = {
+    device = "zroot/home";
+    fsType = "zfs";
+  };
+
   # non persistent root
   fileSystems."/" = {
     device = "none";
diff --git a/kuro/hardware-configuration.nix b/kuro/hardware-configuration.nix
index 7618d97..3eb66db 100644
--- a/kuro/hardware-configuration.nix
+++ b/kuro/hardware-configuration.nix
@@ -13,16 +13,6 @@
   boot.kernelModules = [ "kvm-amd" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/nix" =
-    { device = "zroot/root/nix";
-      fsType = "zfs";
-    };
-
-  fileSystems."/home" =
-    { device = "zroot/root/home";
-      fsType = "zfs";
-    };
-
   fileSystems."/boot" =
     { device = "/dev/disk/by-uuid/5326-AA38";
       fsType = "vfat";
diff --git a/liku/hardware-configuration.nix b/liku/hardware-configuration.nix
index b50f1a6..6e4bccd 100644
--- a/liku/hardware-configuration.nix
+++ b/liku/hardware-configuration.nix
@@ -13,16 +13,6 @@
   boot.kernelModules = [ "kvm-intel" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/nix" =
-    { device = "zroot/root/nix";
-      fsType = "zfs";
-    };
-
-  fileSystems."/home" =
-    { device = "zroot/root/home";
-      fsType = "zfs";
-    };
-
   fileSystems."/boot" =
     { device = "/dev/disk/by-uuid/D95E-E4E3";
       fsType = "vfat";
diff --git a/neko/hardware-configuration.nix b/neko/hardware-configuration.nix
index b90f66f..4665392 100644
--- a/neko/hardware-configuration.nix
+++ b/neko/hardware-configuration.nix
@@ -13,16 +13,6 @@
   boot.kernelModules = [ "kvm-intel" ];
   boot.extraModulePackages = [ ];
 
-  fileSystems."/nix" =
-    { device = "zroot/nix";
-      fsType = "zfs";
-    };
-
-  fileSystems."/home" =
-    { device = "zroot/home";
-      fsType = "zfs";
-    };
-
   fileSystems."/boot" =
     { device = "/dev/disk/by-uuid/9CF2-12FF";
       fsType = "vfat";