Enforce 20GiB minimum vm_size

roles/global_defaults/tasks/main.yml

@@ -52,10 +52,7 @@
           install_type == "physical"
           or (
             vm_size is defined
-            and (
-              (filesystem == "btrfs" and (vm_size | int) >= 10)
-              or (filesystem != "btrfs" and (vm_size | int) >= 20)
-            )
+            and (vm_size | int) >= 20
           )
         )
       - >-
@@ -64,15 +61,19 @@
           or (
             vm_size is defined
             and vm_memory is defined
+            and filesystem is defined
             and (
-              (vm_size | float)
-              >= (
-                (vm_memory | float / 1024 >= 16.0)
-                | ternary(
-                    (vm_memory | float / 2048),
-                    [vm_memory | float / 1024, 4.0] | max
-                  )
-                + 16
+              filesystem != "btrfs"
+              or (
+                (vm_size | float)
+                >= (
+                  (vm_memory | float / 1024 >= 16.0)
+                  | ternary(
+                      (vm_memory | float / 2048),
+                      [vm_memory | float / 1024, 4.0] | max
+                    )
+                  + 5.5
+                )
               )
             )
           )