$ iostat
Linux 2.2.16-22smp (zzy02) 02/02/2002

tty: tin tout avg-cpu: %user %nice %sys %idle %iowait
0 0 14.28 0.00 2.29 0.00 24.43
Disks: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
hdisk0 3.29 14.38 11.37 10967902 8334120
hdisk1 12.13 21.39 17.07 15674576 55459256




　　　　　　

Just give a command like this:
man iostat
Come on, You don't need anybody to explain!
Sorry I can't type Chinese.