diff --git a/nicohack202002/uncloud/opennebula/management/commands/syncvm.py b/nicohack202002/uncloud/opennebula/management/commands/syncvm.py
index 205b066..136e145 100644
--- a/nicohack202002/uncloud/opennebula/management/commands/syncvm.py
+++ b/nicohack202002/uncloud/opennebula/management/commands/syncvm.py
@@ -32,7 +32,11 @@ class Command(BaseCommand):
                     except get_user_model().DoesNotExist:
                         user = get_user_model().objects.create_user(username=vm_owner)
 
-                    vm_object = VMModel.objects.create(vmid=vm_id, owner=user, data=vm)
-                    vm_object.save()
+                    VMModel.objects.update_or_create(
+                        defaults= { 'data': vm,
+                                    'owner': user },
+                        vmid=vm_id
+                    )
+
             else:
                 print(response)
diff --git a/nicohack202002/uncloud/opennebula/models.py b/nicohack202002/uncloud/opennebula/models.py
index cd1a044..babba26 100644
--- a/nicohack202002/uncloud/opennebula/models.py
+++ b/nicohack202002/uncloud/opennebula/models.py
@@ -1,8 +1,32 @@
 from django.db import models
 from django.contrib.auth import get_user_model
 
+from django.contrib.postgres.fields import JSONField
 
 class VM(models.Model):
-    vmid = models.IntegerField()
+    vmid = models.IntegerField(primary_key=True)
     owner = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
-    data = models.CharField(max_length=65536, null=True)
+    data = JSONField()
+
+
+    def cores(self):
+        return self.data['TEMPLATE']['VCPU']
+
+    def ram_in_gb(self):
+        return (int(self.data['TEMPLATE']['MEMORY'])/1024.)
+
+    def disks(self):
+        """
+        If there is no disk then the key DISK does not exist.
+
+        If there is only one disk, we have a dictionary in the database.
+
+        If there are multiple disks, we have a list of dictionaries in the database.
+        """
+
+        if not 'DISK' in self.data['TEMPLATE']['DISK']:
+            return []
+        elif type(self.data['TEMPLATE']['DISK']) is dict:
+            return [ self.data['TEMPLATE']['DISK'] ]
+        else:
+            return self.data['TEMPLATE']['DISK']