diff --git a/hosts/physiques/cephiroth/default.nix b/hosts/physiques/cephiroth/default.nix
index 196ed0a..d82fa5b 100644
--- a/hosts/physiques/cephiroth/default.nix
+++ b/hosts/physiques/cephiroth/default.nix
@@ -6,7 +6,7 @@
     ./networking.nix
   ];
 
-  networking.hostId = "121cdcb4";
+  networking.hostId = "bbdd1133";
   networking.hostName = "cephiroth";
 
   boot.loader.grub = {
@@ -18,12 +18,20 @@
       #   devices = ["/dev/sdi"];
       #   path = "/boot";
       # }
+      # {
+      #   devices = [ "/dev/sdj" ];
+      #   path = "/boot-fallback";
+      # }
       {
-        devices = [ "/dev/sdj" ];
+        devices = ["nodev"];
         path = "/boot-fallback";
       }
     ];
-    devices = ["/dev/sdi" "/dev/sdj"];
+  };
+
+  boot.tmp = {
+    useTmpfs = true;
+    cleanOnBoot = true;
   };
 
 
diff --git a/hosts/physiques/cephiroth/networking.nix b/hosts/physiques/cephiroth/networking.nix
index c1b540b..d43206f 100644
--- a/hosts/physiques/cephiroth/networking.nix
+++ b/hosts/physiques/cephiroth/networking.nix
@@ -10,6 +10,10 @@
         id = 3;
         interface = "bond0";
       };
+      ceph = {
+        id = 6;
+        interface = "bond0";
+      };
       adm = {
         id = 10;
         interface = "bond0";
@@ -22,6 +26,9 @@
     };
 
     interfaces = {
+      enp11s0f0.mtu = 9000;
+      enp11s0f1.mtu = 9000;
+      
       srv-nat = {
         ipv4 = {
           addresses = [
@@ -32,6 +39,16 @@
           ];
         };
       };
+      ceph = {
+        ipv4 = {
+          addresses = [
+            {
+              address = "172.16.6.3";
+              prefixLength = 24;
+            }
+          ];
+        };
+      };
       adm = {
         ipv4 = {
           addresses = [