diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-1.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-1.json
index f52e603cb3d2d024f724461a676e980257819ffc..3c359a7cc9c3ade0d3737330ce67b7a0070c9b25 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-1.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-1.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-10.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-10.json
index d907154d9239bd930dbaf7f102f6e9f7ee3cdacf..7d55a7080d2e084655bb3d13d3e463afe29a2165 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-10.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-10.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-11.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-11.json
index 981099767f9e175224a07b2abb7c4273b7d96e82..675f77367a88788f92258d24dae22a8d8104be44 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-11.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-11.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-12.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-12.json
index 3bf14d592ff258179b0ffb4c8691ed1dec17ed20..f4eceafb5c1a09e815824f47e07b7e1ac56d7f0e 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-12.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-12.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-13.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-13.json
index 05506702393a1cfa825fa6dbe2d328ef9fab46ec..42f58937cba3a00eeff15a76f3b8923571652d66 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-13.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-13.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-14.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-14.json
index c3ff30b9339bc312a9fbfa731968f60ef5558e34..f597104019a47c23f6065a91319e39e488cdcb58 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-14.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-14.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-2.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-2.json
index 22837c419fc144cb676cb5a90dc22f38b952c256..fcaeae64a805581d3da78df02619e7aa38375bc3 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-2.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-2.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-3.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-3.json
index 089492acda715c197f0038c8b8f4e722fa46c5ff..ac70162bbd7ad8951cd0adcead0bb2750a2d2cf0 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-3.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-3.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-4.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-4.json
index 60b418dad9a84c24f50d6512c269b9643b9533f5..6ef272c545a2f1285a3ea2bcd6e9b1a9a5777654 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-4.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-4.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-5.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-5.json
index 2e709ebf763a31bf64b27351a59ad33f7c981043..606a738a4321f3dbc93f0176baadab1b3b52d2ea 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-5.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-5.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-6.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-6.json
index 12b0afa69d5715397d92174fa5ee7b6a68242c53..af79556c011d7ad5b7423c13b71116ea9c3d7a99 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-6.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-6.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-7.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-7.json
index 23a628d5677e2416986e166040daf3f0d40af49b..8b655103ea3e324995e2f83cedd72b8555147fdb 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-7.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-7.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-8.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-8.json
index 70c235ac1cb731dec6cb9121d2b493f819b04408..aaee1252e203d002d2c9feeb83dcb0b6630e5927 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-8.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-8.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-9.json b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-9.json
index f8094773fdc28933eaff032c1a5eb80e1851cf79..4d2944bceb4c0d4c3043c346645134d55af41a1c 100644
--- a/data/grid5000/sites/nancy/clusters/grele/nodes/grele-9.json
+++ b/data/grid5000/sites/nancy/clusters/grele/nodes/grele-9.json
@@ -127,6 +127,7 @@
     "name": "debian",
     "pstate_driver": "intel_pstate",
     "pstate_governor": "performance",
+    "release": "Jessie",
     "turboboost_enabled": true,
     "version": 8.8
   },
diff --git a/grid5000-all.json b/grid5000-all.json
index 39359deaa50bc98aff6c49cd15d99264043aaee9..298fafa57ac1a5c1ff8214f8ae700c8f03b067f2 100644
--- a/grid5000-all.json
+++ b/grid5000-all.json
@@ -102833,6 +102833,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -103043,6 +103044,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -103253,6 +103255,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -103463,6 +103466,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -103673,6 +103677,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -103883,6 +103888,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -104093,6 +104099,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -104303,6 +104310,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -104513,6 +104521,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -104723,6 +104732,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -104933,6 +104943,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -105143,6 +105154,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -105353,6 +105365,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
@@ -105563,6 +105576,7 @@
                 "name": "debian",
                 "pstate_driver": "intel_pstate",
                 "pstate_governor": "performance",
+                "release": "Jessie",
                 "turboboost_enabled": true,
                 "version": 8.8
               },
diff --git a/input/grid5000/sites/nancy/clusters/grele/grele.yaml b/input/grid5000/sites/nancy/clusters/grele/grele.yaml
index 4c1e4e47c202e3b96f2fe9bc9a767218a1fd92be..2d70cfdd2ddb51846f28fac9e5043859f4e982ec 100644
--- a/input/grid5000/sites/nancy/clusters/grele/grele.yaml
+++ b/input/grid5000/sites/nancy/clusters/grele/grele.yaml
@@ -21,6 +21,8 @@ nodes:
     performance:
       core_flops: 15690000000
       node_flops: 398100000000
+    operating_system:
+      release: Jessie
     gpu:
       gpu: true
       gpu_count: 2