[global] ioengine=libaio direct=1 filename=t0002file iodepth=128 size=1G loops=1 group_reporting=1 readwrite=write do_verify=0 verify=md5 numjobs=1 thread bssplit=512/50:1M/50 [thread0] offset=0G [thread-mix0] offset=4G readwrite=rw size=1G bsrange=512:1M