fo0@tuna:~$ /usr/bin/iostat -xtc 5 2
                 extended device statistics                    tty         cpu
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b  tin tout  us sy wt id
sd1       3.3  219.9  102.0 1048.0  3.6  0.7   19.2  46  43    1 18326   4  5  0 92
sd2       3.2  219.9  100.8 1048.0  3.6  0.7   19.3  47  43
sd3       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0
                 extended device statistics                    tty         cpu
device    r/s    w/s   kr/s   kw/s wait actv  svc_t  %w  %b  tin tout  us sy wt id
sd1       0.8  280.8    1.8 1128.5  4.0  0.5   15.9  46  47    0   75   8  6  0 86
sd2       2.0  280.8   54.2 1128.5  4.6  0.5   18.2  56  55
sd3       0.0    0.0    0.0    0.0  0.0  0.0    0.0   0   0