private void cleanDiskDirsInEveryVM() throws IOException {
    FileUtils.deleteDirectory(getDiskDirFor(vm0));
    FileUtils.deleteDirectory(getDiskDirFor(vm1));
    FileUtils.deleteDirectory(getDiskDirFor(vm2));
    FileUtils.deleteDirectory(getDiskDirFor(vm3));
  }
Test what happens when we restart persistent members while there is an accessor concurrently
performing puts.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/backup/BackupDistributedTest.java