update changes, to not remove/disconnect MDMs on maintenance

Author: sureshanaparti

plugins/storage/volume/scaleio/src/main/java/org/apache/cloudstack/storage/datastore/driver/ScaleIOPrimaryDataStoreDriver.java

@@ -1497,6 +1497,12 @@ public boolean canDisconnectHostFromStoragePool(Host host, StoragePool pool) {
             return false;
         }
 
+        List<StoragePoolHostVO> poolHostVOsBySdc = storagePoolHostDao.findByLocalPath(sdcId);
+        if (CollectionUtils.isNotEmpty(poolHostVOsBySdc) && poolHostVOsBySdc.size() > 1) {
+            logger.debug(String.format("There are other connected pools with the same SDC of the host %s, shouldn't disconnect SDC", host));
+            return false;
+        }
+
         try {
             final ScaleIOGatewayClient client = getScaleIOClient(pool);
             return client.listVolumesMappedToSdc(sdcId).isEmpty();