From 6b4521b38a688cf6072d6fc849171022af1e1490 Mon Sep 17 00:00:00 2001
From: "ye.zou" <ye.zou@zstack.io>
Date: Thu, 12 Feb 2026 12:02:19 +0800
Subject: [PATCH] <fix>[vm]: use max of virtual and actual size for root disk
 when no disk offering

Resolves: ZSTAC-74683

Change-Id: Id0339ed0221e92e506f60745cde972cc3ee6d9ae
---
 header/src/main/java/org/zstack/header/vm/VmInstanceSpec.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/header/src/main/java/org/zstack/header/vm/VmInstanceSpec.java b/header/src/main/java/org/zstack/header/vm/VmInstanceSpec.java
index 7007c592aea..99ee2173b98 100755
--- a/header/src/main/java/org/zstack/header/vm/VmInstanceSpec.java
+++ b/header/src/main/java/org/zstack/header/vm/VmInstanceSpec.java
@@ -847,7 +847,9 @@ public void setBootMode(String bootMode) {
 
     public long getRootDiskAllocateSize() {
         if (rootDiskOffering == null) {
-            return this.getImageSpec().getInventory().getSize();
+            long virtualSize = this.getImageSpec().getInventory().getSize();
+            long actualSize = this.getImageSpec().getInventory().getActualSize();
+            return Math.max(virtualSize, actualSize);
         }
         return rootDiskOffering.getDiskSize();
     }