I need command line disk useage monitor app !!!
 

I have a big file server, I want to real time kown the server I/O performance, for example the I/O Mb_read/s Mb_write/s ... but all is runing at command line.

I have find one is sysstat that include a sub application that is iostat , but I doubt that report data is not very nicety, so i want to
find the other one.

help me, thank :D

Isn't that what top does?

System Activity Report - SAR

I would advise performing a man on sar via the command line to understand how to use it correctly.