static boolean isInstanceofOverflowOnlyWithLongOffset(DiskId diskId) {
    return diskId instanceof OverflowOnlyWithLongOffset;
  }
Test method to verify if the passed DiskId is an instance of PersistenceWithLongOffset.

@param diskId - the DiskId instance
@return true if the given DiskId is an instance of LongOplogOffsetDiskId
geode-core/src/main/java/org/apache/geode/internal/cache/DiskId.java