You should have a look to the IOPS instead bandwidth root@instantcloud:~# fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filen

You should have a look to the IOPS instead bandwidth root@instantcloud:~# fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=16 --size=4G --readwrite=randwrite test: (g=0): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=16 fio-2.1.11 Starting 1 process Jobs: 1 (f=1): [w(1)] [100.0% done] [0KB/18714KB/0KB /s] [0/4678/0 iops] [eta 00m:00s] root@instantcloud:~# fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=16 --size=4G --readwrite=randread test: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=libaio, iodepth=16 fio-2.1.11 Starting 1 process Jobs: 1 (f=1): [r(1)] [100.0% done] [22307KB/0KB/0KB /s] [5576/0/0 iops] [eta 00m:00s]