Disk speed and utilization

// quest test of disk write speed
dd if=/dev/zero of=diskbench bs=1M count=1024 conv=fdatasync

// see how busy your disk is
atop
iotop -oPa
iostat

// make atop capture utilization continuously
systemctl enable --now atop-rotate.timer
systemctl status atop-rotate.timer
// configuration is at /etc/sysconfig/atop

// test sequential read speed
ioping -RL <device>

// test disk seek rate
ioping -R <device>

// disk latency (tests device hosting current directory)
ioping .

// disk read and write test (tests device hosting current directory)
fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75