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

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