def _get_cache_slabs(server_name=None):
    """
    Get slabs info.
    """
    server_info = {}
    for svr in mc_client.get_slabs():
        svr_info = svr[0].split(' ')
        svr_name = svr_info[0]
        if server_name and server_name == svr_name:
            return svr[1]
        server_info[svr_name] = svr[1]
    return server_info