diff --git a/services/enclosure.py b/services/enclosure.py
index ad2b8bf..b142200 100644
--- a/services/enclosure.py
+++ b/services/enclosure.py
@@ -51,6 +51,18 @@ def discover_enclosures() -> list[dict]:
         slots = list_slots(enc_id)
         total = len(slots)
         populated = sum(1 for s in slots if s["populated"])
+        has_devices = any(s["device"] for s in slots)
+
+        # Skip secondary/passive IOM paths: enclosures where SES reports
+        # populated slots but the kernel has no device symlinks for any of
+        # them (the drives are owned by the primary IOM enclosure entry).
+        if populated > 0 and not has_devices:
+            logger.info(
+                "Skipping enclosure %s (%s %s) — %d populated slots but no "
+                "device links (likely a secondary IOM path)",
+                enc_id, vendor, model, populated,
+            )
+            continue
 
         enclosures.append({
             "id": enc_id,