Hello, I test my ceph cluster and monitoring the disk utilization while writing into the cluster. First I test my disk can write with a speed of 60MB/s using fio (bs=64k threads=128) when formating it as xfs file system. After that I integrate it to ceph cluster. During writing data into rbd image I find the disk speed is around 10M/s (I monintor the speed using command: iostat -xm 1, and most of the time the disk utils is around 100%), I don't know why the disk is far less speed than that of using it independently. Can anyone give me some hints?
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