diff --git a/uncloud/uncloud_vm/models.py b/uncloud/uncloud_vm/models.py
index b1aab40..bba01c5 100644
--- a/uncloud/uncloud_vm/models.py
+++ b/uncloud/uncloud_vm/models.py
@@ -1,12 +1,41 @@
 from django.db import models
 
 
+class VMHost(models.Model):
+    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+
+    # 253 is the maximum DNS name length
+    hostname = models.CharField(max_length=253)
+
+    # indirectly gives a maximum number of cores / VM - f.i. 32
+    physical_cores = models.IntegerField()
+
+    # determines the maximum usable cores - f.i. 320 if you overbook by a factor of 10
+    usable_cores = models.IntegerField()
+
+    # ram that can be used of the server
+    usable_ram_in_gb = models.FloatField()
+
+
 class VM(models.Model):
     uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
     owner = models.ForeignKey(get_user_model(), on_delete=models.CASCADE)
 
     cores = models.IntegerField()
-    ram = models.FloatField()
+    ram_in_gb = models.FloatField()
+
+    vmhost   = models.ForeignKey(VMHost, on_delete=models.CASCADE)
 
 
 class VMDisk(models.Model):
+    uuid = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
+    vm   = models.ForeignKey(VM, on_delete=models.CASCADE)
+    size_in_gb = models.FloatField()
+
+    storage_class = models.CharField(max_length=32,
+                              choices = (
+                                  ('hdd', 'HDD'),
+                                  ('ssd', 'SSD'),
+                              ),
+                              default='ssd'
+    )