void confirmMultiDirStrategy() {
    if (getMultiDirStrategyClassName() == null) {
      multiDirStrategyClassName = DEFAULT_MULTI_DIR_STRATEGY;
    }
    if (!getMultiDirStrategyClassName().contains(TsFileConstant.PATH_SEPARATOR)) {
      multiDirStrategyClassName = MULTI_DIR_STRATEGY_PREFIX + multiDirStrategyClassName;
    }

    try {
      Class.forName(multiDirStrategyClassName);
    } catch (ClassNotFoundException e) {
      logger.warn(
          "Cannot find given directory strategy {}, using the default value",
          getMultiDirStrategyClassName(),
          e);
      setMultiDirStrategyClassName(MULTI_DIR_STRATEGY_PREFIX + DEFAULT_MULTI_DIR_STRATEGY);
    }
  }
if the folders are relative paths, add IOTDB_DATA_HOME as the path prefix
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/conf/IoTDBConfig.java