diff --git a/pkg/compute/models/disks.go b/pkg/compute/models/disks.go
index ee7475b64c..47e0c7e26a 100644
--- a/pkg/compute/models/disks.go
+++ b/pkg/compute/models/disks.go
@@ -725,10 +725,13 @@ func (self *SDisk) PerformResize(ctx context.Context, userCred mcclient.TokenCre
 	}
 
 	guests := self.GetGuests()
-	if len(guests) != 1 {
-		return nil, httperrors.NewBadRequestError("Cann't resize disk when attach to mutil guest")
+
+	var guest *SGuest
+	if len(guests) == 1 {
+		guest = &guests[0]
 	}
-	return nil, self.StartDiskResizeTask(ctx, userCred, int64(sizeMb), "", &pendingUsage, &guests[0])
+
+	return nil, self.StartDiskResizeTask(ctx, userCred, int64(sizeMb), "", &pendingUsage, guest)
 }
 
 func (self *SDisk) GetIStorage() (cloudprovider.ICloudStorage, error) {
diff --git a/pkg/compute/tasks/disk_resize_task.go b/pkg/compute/tasks/disk_resize_task.go
index cc8113b6c0..f415de1d3b 100644
--- a/pkg/compute/tasks/disk_resize_task.go
+++ b/pkg/compute/tasks/disk_resize_task.go
@@ -47,7 +47,7 @@ func (self *DiskResizeTask) OnInit(ctx context.Context, obj db.IStandaloneModel,
 	}
 
 	disk.SetStatus(self.GetUserCred(), models.DISK_START_RESIZE, "")
-	if masterGuest == nil {
+	if masterGuest != nil {
 		masterGuest.SetStatus(self.GetUserCred(), models.VM_RESIZE_DISK, "")
 	}
 	self.StartResizeDisk(ctx, host, storage, disk, masterGuest)