Hi, Sage and all Cepher I find that CEPH_FEATURE bit uses uint64_t and only 64 bits can be used totally. However, it will be exhausted soon. What should we do then? Thanks Regards Ning Yao -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html