Package iotop

Top like utility for I/O

http://guichaz.free.fr/iotop/

Linux has always been able to show how much I/O was going on
(the bi and bo columns of the vmstat 1 command).
iotop is a Python program with a top like UI used to
show of behalf of which process is the I/O going on.
System Administration (Section 8)
iotop
iotop watches I/O usage information output by the Linux kernel (requires 2.6.20 or later) and displays a table of current I/O usage by processes or threads on...