@Override
  protected final void postSetUp() throws Exception {
    diskProps.setOverFlowCapacity(100000);
    region = DiskRegionHelperFactory.getSyncOverFlowOnlyRegion(cache, diskProps);

    log = ds.getLogWriter();
  }
Disk region Perf test for Overflow only with Sync writes. 1) Performance of get operation for
entry in memory.
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/diskPerf/DiskRegOverflowSyncGetInMemPerfJUnitPerformanceTest.java