fio

fio(flexible I/O tester) is a tool that will spawn a number of threads or processes doing a particular type of I/O action as specified by the user. The typical use of fio is to write a job file matching the I/O load one wants to simulate.

Order R/W

fio --name=seq_write_test \
         --rw=write \
         --bs=1M \
         --filename=/sda2_testfile.fio \
         --size=4G \
         --iodepth=64 \
         --ioengine=libaio \
         --direct=1 \
         --runtime=60 \
         --numjobs=4 \
         --group_reporting