Hi Cephers, I did some experiment today to compare the latency between one P3500(2T nvme SSD) and bluestore(fio + libfio_objectstore.so): For iodepth = 1, the random write latency of bluestore is 276.91us, compare with 14.71 of SSD, big overhead. I also test iodepth = 16, Still, there is a big overhead.(143 us -> 642 us) What is your opinion? Thanks Pan -- 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