private File getDiskDir(int vmId) {
    File diskDir = diskDirs.get(vmId);
    diskDir.mkdirs();
    return diskDir;
  }
Tests to make sure that after we get a conflicting persistent data exception, we can still
recover.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/persistence/PersistentRecoveryOrderDUnitTest.java