raidz2/fio-jobs/rand-write-qd4-nj1.fio
[global] ioengine=libaio direct=1 directory=/tank-raidz2/bench filename_format=fiofile.$jobnum size=64G runtime=180 time_based=1 ramp_time=10 group_reporting=1 [rand-write-qd4-nj1] rw=randwrite bs=4k iodepth=4 numjobs=1