Iostat

Storage monitoring

apt install sysstat

iostat

iostat

Show just device utilization (no cpu)

iostat -d

Human-readable output

iostat -h

See all partitions

iostat -p ALL

See just a partition

iostat -p sda

Refresh io statistics every 5 seconds

iostat 5

pidstat

pidstat -d

Refresh pid statistics every 5 seconds

pidstat -d 5 

dmsetup

sudo dmsetup info /dev/dm-0