abh1sar commented on code in PR #12451:
URL: https://github.com/apache/cloudstack/pull/12451#discussion_r2703669346


##########
server/src/main/java/com/cloud/storage/StorageManagerImpl.java:
##########
@@ -1564,8 +1564,12 @@ protected String 
getStoragePoolNonDestroyedVolumesLog(long storagePoolId) {
 
         sb.append("[");
         for (VolumeVO vol : nonDestroyedVols) {
-            volInstance = _vmInstanceDao.findById(vol.getInstanceId());
-            logMessageInfo.add(String.format("Volume [%s] (attached to VM 
[%s])", vol.getUuid(), volInstance.getUuid()));
+            if (vol.getInstanceId() != null) {
+                volInstance = _vmInstanceDao.findById(vol.getInstanceId());
+                if (volInstance != null) {
+                    logMessageInfo.add(String.format("Volume [%s] (attached to 
VM [%s])", vol.getUuid(), volInstance.getUuid()));
+                }
+            }

Review Comment:
   I think we should log detached volumes also is that all non-destroyed 
volumes are logged in the caller
   
   ```               
    logger.debug("Cannot delete storage pool {} as the following non-destroyed 
volumes are on it: {}.", sPool::toString, () -> 
getStoragePoolNonDestroyedVolumesLog(sPool.getId()));
   ```
   
   Something like
   
   `logMessageInfo.add(String.format("Volume [%s] (not attached to any VM)", 
vol.getUuid());`
   



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