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