Hi, I am using fio to test performance of a large amount of small files. I use rbd of ceph and map the image to a device, mount the device and write a lot of small files. I want to know whether fio can test performance of small files well. I use the engine libaio, my config is: [global] ioengine=libaio buffered=0 rw=randwrite bs=4k size=1G io_size=1G iodepth=256 filesize=4k nrfiles=256000 [job1] directory=rbdmap/rbdmap0 I don't know whether my config is correct. Because I increase the filesize from 4k to 256k, and modify size and io_size. The result of bandwidth and iops is as following: I don't know whether the performance is correct, or fio is not suitable for a lot of small files. Thanks. -- Shaonan Ma Tsinghua University
