private DiskStore createDiskStoreWithSizeInBytes(String diskStoreName,
      DiskStoreFactory diskStoreFactory,
      long maxOplogSizeInBytes) {
    ((DiskStoreFactoryImpl) diskStoreFactory).setMaxOplogSizeInBytes(maxOplogSizeInBytes);
    ((DiskStoreFactoryImpl) diskStoreFactory).setDiskDirSizesUnit(DiskDirSizesUnit.BYTES);
    return diskStoreFactory.create(diskStoreName);
  }
Regression test for TRAC #41770: ConcurrentRegionOperationsJUnitTest fails with duplicate
create in an oplog
geode-core/src/integrationTest/java/org/apache/geode/internal/cache/DiskRegionJUnitTest.java