Disc benchmark

bench.md

1. Preferable stop any process that using that disc a lot.
2. cd to a directory on disc
3. mkdir bench && cd bench
4. Random read and write performance IOPS. (it will use 8GB for tmp file)

fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=fiotest --filename=testfio --bs=4k --iodepth=64 --size=8G --readwrite=randrw --rwmixread=75

1. latency

ioping -c 20 .