linux中从IO的每秒读写，及使用带宽的值获取最大值

iostat -dmx 1 | awk '{ if ( $1 !~/(Linux|dm)/ ){ if ($1 != "Device:"){ a[$1] = a[$1] < $4 ? $4 : a[$1];b[$1] = b[$1] < $5 ? $5 : b[$1];c[$1] = c[$1] < $6 ? $6 : c[$1];d[$1] = d[$1] < $7 ? $7 : d[$1];print $1"\t\t"a[$1]"\t\t"b[$1]"\t\t"c[$1]"\t\t"d[$1];}else{print $1"\t\t"$4"\t\t"$5"\t\t"$6"\t\t"$7;}}}'