Iostat

Linux tool for monitoring I/O info over time interval.

Documentation

man iostat

https://man.archlinux.org/man/iostat.1

Usage

iostat -dx 5

rrqm/s, wrqm/s:  number of read/write requests per second that could be 'meged' into a single read/write request

r/s, w/s:        number of read/write requests per second

rsec/s, wsec/s:  number of sectors read/written per second

avgqu-sz:        number of requests waiting

await:           avg ms for request queue time