private static void cleanupOffline() {
    if (offlineCache != null) {
      offlineCache.close();
      offlineCache = null;
    }
    if (offlineDS != null) {
      offlineDS.disconnect();
      offlineDS = null;
    }
  }
Release the lock that is preventing operations on this disk store during the backup process.
geode-core/src/main/java/org/apache/geode/internal/cache/DiskStoreImpl.java