private void restoreDisk() throws IOException {
    File tmpDir = new File(dirs[0].getParent(), "backupDir");
    for (File file : dirs) {
      FileUtils.deleteDirectory(file);
      FileUtils.copyDirectory(new File(tmpDir, file.getName()), file);
    }
  }
Validate that values are, or are not, in memory
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/DiskRegionAsyncRecoveryJUnitTest.java