如果有多个磁盘， 计算的时候就需要计算平均值，显然直接利用linux的iostat的命令不能完成这个需求，下面是个简单的计算磁盘相关平均指标的脚本
#! /bin/bash
#iostat -x 1 2 > 1.txt
#sed -i '1,22'd 1.txt
# $1 is file name
file_name=$1
grep -E "(sd)[b-m]" $file_name | awk '{print $4}' | awk 'BEGIN {sum=0;c=0;}{sum+=$1;c++;} END {print "r/s: \n" c,sum,sum/c}'
grep -E "(sd)[b-m]" $file_name | awk '{print $5}' | awk 'BEGIN {sum=0;c=0;}{sum+=$1;c++;} END {print "w/s: \n" c,sum/c}'
grep -E "(sd)[b-m]" $file_name | awk '{print $4,$5}' | awk 'BEGIN {sum=0;c=0;}{sum+=$1+$2;c++;} END {print "rw/s: \n" c,sum/c}'
grep -E "(sd)[b-m]" $file_name | awk '{print $6}' | awk 'BEGIN {sum=0;c=0;}{sum+=$1;c++;} END {print "rMB/s: \n" c,sum/c,sum/1024/1024*8}'
grep -E "(sd)[b-m]" $file_name | awk '{print $7}' | awk 'BEGIN {sum=0;c=0;}{sum+=$1;c++;} END {print "wMB/s: \n" c,sum/1024/1024*8}'
grep -E "(sd)[b-m]" $file_name | awk '{print $6,$7}' | awk 'BEGIN {sum=0;c=0;}{sum+=$1+$2;c++;} END {print "rwMB/s: \n" c,sum/1024/1024*8}'
grep -E "(sd)[b-m]" $file_name | awk '{print $4,$5,$13}' | awk 'BEGIN {rwsum=0;c=0;svctm=0}{rwsum+=$1+$2;svctm+=$3;c++;} END {print "%util: \n" c,rwsum*(svctm/10)/c/c}'
执行 iostat -x 1,截取第二次的磁盘IO相关值,放在aa文件中， 比如
avg-cpu: %user %nice %system %iowait %steal %idle
22.48 0.00 41.12 36.03 0.00 0.38
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 5.60 50.47 77.13 202.13 6131.73 99.28 4.36 34.18 1.17 55.77 0.36 4.64
sdm 0.00 0.00 51.80 38.53 19755.47 19729.07 874.20 2.08 23.06 12.90 36.72 9.74 87.95
sdj 0.00 0.00 60.87 45.07 21913.07 23074.13 849.35 2.25 21.26 16.18 28.13 9.37 99.31
sdi 1845.93 0.00 94.07 45.33 23076.80 23210.67 664.10 5.00 35.89 30.75 46.56 7.16 99.84
sdd 0.00 0.00 59.87 43.13 22012.00 22084.27 856.24 2.20 21.47 16.49 28.37 9.62 99.09
sdh 0.00 0.00 58.60 43.33 21451.73 22186.67 856.21 2.22 21.89 16.56 29.11 9.64 98.24
sdg 0.00 0.00 63.93 32.87 24493.87 16827.73 853.75 1.82 18.69 13.66 28.47 9.59 92.85
sde 0.00 0.00 57.20 44.80 21725.87 22937.60 875.75 2.27 22.24 16.81 29.18 9.60 97.92
sdb 91.80 0.00 65.60 35.73 24418.13 18295.47 843.03 2.15 21.21 16.13 30.54 9.82 99.52
sdl 0.00 0.00 58.13 38.87 20926.93 19899.73 841.79 2.03 20.98 16.17 28.17 9.89 95.95
sdf 0.00 0.00 56.67 41.80 21868.27 21401.60 878.87 2.05 20.82 16.38 26.85 9.78 96.29
sdk 0.00 0.00 57.53 46.60 20996.53 23859.20 861.51 2.35 22.60 17.13 29.34 9.54 99.36
sdc 0.00 0.00 59.40 44.20 21436.27 22630.40 850.71 2.32 22.29 16.61 29.93 9.60 99.47
直接执行脚本 sh stat_iostat.sh aa
r/s:
12 743.67 61.9725
w/s:
12 500.26 41.6883
rw/s:
12 1243.93 103.661
rMB/s:
12 264075 22006.2 2.01473
wMB/s:
12 256137 21344.7 1.95417
rwMB/s:
12 520211 43351 3.9689
%util:
12 97.916
上面数据解读： 1. 磁盘的读写直接转化成流量就是 3.96G 2. 磁盘的平均%util达到 97%