Pick cheapest GPU SKU and pin the VM to an existing disk AZ.

Scan ru-6 by Nova availability zones (a/b/c). First boot uses FLAVOR_SIZE_PRESET=cheap; reruns stay on the disk segment.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_inventory.py

@@ -9,13 +9,25 @@ from gpu_rent.inventory import (
 
 
 class FakeFlavor:
-    def __init__(self, flavor_id: str, name: str, extra=None, disabled: bool = False):
+    def __init__(
+        self,
+        flavor_id: str,
+        name: str,
+        extra=None,
+        disabled: bool = False,
+        vcpus: int = 8,
+        ram: int = 32768,
+        disk: int = 0,
+        availability_zones=None,
+    ):
         self.id = flavor_id
         self.name = name
         self.extra_specs = extra or {}
         self.is_disabled = disabled
-        self.vcpus = 8
-        self.ram = 32768
+        self.vcpus = vcpus
+        self.ram = ram
+        self.disk = disk
+        self.availability_zones = list(availability_zones or [])
 
 
 def test_match_4090_24_not_48():
@@ -74,6 +86,46 @@ def test_resolve_flavor_no_fallback_requires_default():
     assert picked.id == "ok"
 
 
+def test_rank_cheap_prefers_1gpu_min_sku():
+    extra = {"aggregate_instance_extra_specs:gpu": "RTX4090", "gpu_memory": "24"}
+    flavors = [
+        FakeFlavor("dual", "GL10.8-65536-0-2GPU", extra, vcpus=8, ram=65536),
+        FakeFlavor("fat", "GL10.8-32768-0-1GPU", extra, vcpus=8, ram=32768),
+        FakeFlavor("tiny", "GL10.4-16384-0-1GPU", extra, vcpus=4, ram=16384),
+    ]
+    ranked = rank_flavors(flavors, ("4090-24",), size_preset="cheap")
+    assert ranked[0].id == "tiny"
+    assert ranked[0].gpu_count == 1
+    balanced = rank_flavors(flavors, ("4090-24",), size_preset="balanced")
+    assert balanced[0].id == "fat"
+
+
+def test_rank_filters_availability_zone():
+    extra = {"aggregate_instance_extra_specs:gpu": "RTX4090", "gpu_memory": "24"}
+    flavors = [
+        FakeFlavor(
+            "a",
+            "GL10.4-16384-0-1GPU",
+            extra,
+            vcpus=4,
+            ram=16384,
+            availability_zones=["ru-6a"],
+        ),
+        FakeFlavor(
+            "h200",
+            "GL-H200",
+            {"aggregate_instance_extra_specs:gpu": "H200"},
+            vcpus=12,
+            ram=120000,
+            availability_zones=["ru-6b"],
+        ),
+    ]
+    in_a = rank_flavors(flavors, ("4090-24", "a5000"), az="ru-6a")
+    assert [x.id for x in in_a] == ["a"]
+    in_b = rank_flavors(flavors, ("4090-24",), az="ru-6b")
+    assert in_b == []
+
+
 def test_pick_boot_image_prefers_24_580_without_docker():
     class Img:
         def __init__(self, name):