diff --git a/plugin/kvm/src/main/java/org/zstack/kvm/hypervisor/KvmHypervisorInfoManagerImpl.java b/plugin/kvm/src/main/java/org/zstack/kvm/hypervisor/KvmHypervisorInfoManagerImpl.java
index f9501fe279e..df330171cf6 100644
--- a/plugin/kvm/src/main/java/org/zstack/kvm/hypervisor/KvmHypervisorInfoManagerImpl.java
+++ b/plugin/kvm/src/main/java/org/zstack/kvm/hypervisor/KvmHypervisorInfoManagerImpl.java
@@ -275,13 +275,15 @@ private boolean saveMetadataList(List<HypervisorMetadataDefinition> definitions)
 
     @Transactional
     protected boolean saveHostOsCategoryList(List<HostOsCategoryVO> categoryVOS) {
+        if (CollectionUtils.isEmpty(categoryVOS)) {
+            logger.warn("no hypervisor metadata collected from DVD, skip refresh to preserve existing metadata");
+            return false;
+        }
+
         // refresh all metadata with current management node
         SQL.New(KvmHostHypervisorMetadataVO.class)
                 .eq(KvmHostHypervisorMetadataVO_.managementNodeUuid, Platform.getManagementServerId())
                 .delete();
-        if (CollectionUtils.isEmpty(categoryVOS)) {
-            return false;
-        }
 
         Set<String> requestArchitectures = categoryVOS.stream()
                 .map(HostOsCategoryVO::getArchitecture)