Dstat

dstat for monitoring io usage

We can use dstat for monitoring hard disk or IO usage. From man page we can see that 'dstat -M time,cpu,net,disk,sys,load,proc,topcpu' command gives good enough information on process which is using disk a lot. dstat man pages also lists names of various other monitoring tools that can be very handy.

From dstat man page:

Performance tools	ifstat(1), iftop(8), iostat(1), mpstat(1), netstat(1), nfsstat(1), nstat, vmstat(1), xosview(1)
Debugging tools	htop(1), lslk(1), lsof(8), top(1)
Process tracing	ltrace(1), pmap(1), ps(1), pstack(1), strace(1)
Binary debugging	ldd(1), file(1), nm(1), objdump(1), readelf(1)
Memory usage tools	free(1), memusage, memusagestat, slabtop(1)
Accounting tools	dump-acct, dump-utmp, sa(8)
Hardware debugging tools	dmidecode, ifinfo(1), lsdev(1), lshal(1), lshw(1), lsmod(8), lspci(8), lsusb(8), smartctl(8), x86info(1)
Application debugging	mailstats(8), qshape(1)
Xorg related tools	xdpyinfo(1), xrestop(1)
Other useful info	collectl(1), proc(5), procinfo(8)