Using sysbench

gistfile1.txt

# install sysbench with
# sudo yum --enablerepo=epel install -y sysbench
 
 
targetDir=/data/benchmark # pick a directory inside your target file system
fileSize=300G # pick large enough size that you aren't using FS cache effectively
threads=128
test=rndrw # can also use rndrd
blockSize=4096
 
mkdir $targetDir
cd $targetDir
 
# first time step - build the files it will use
sysbench --num-threads=$threads --test=fileio --file-total-size=$fileSize  prepare
 
# run the actual benchmark
sysbench --test=fileio --file-test-mode=$test --file-extra-flags=direct --file-fsync-freq=0 --file-total-size=$fileSize --max-time=300 --num-threads=$threads