void writePage() throws PersistitException {
        _persistit.checkFatal();
        final Volume volume = getVolume();
        if (volume != null) {
            clearSlack();
            save();
            _vol.getStorage().writePage(this);
            clearDirty();
            volume.getStatistics().bumpWriteCounter();
            _pool.bumpWriteCounter();
        }
    }