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iostat

IOStat

Apr 2017


IOStat gives information (disk performance) about the disk activity in a Linux environment. Useful information such as disk reads/writes and activity (% busy).

IOStat is a handy tool to ensure that you are not overworking the disks, this is especially useful on products like VSPP where disk usage can be exceeded before any CPU performance issues occur.

To use, from the command line simply enter iostat

iostat

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          33.60    0.00    0.50    0.02    0.00   65.87

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sda               7.36         0.19      1112.01     967702 5556997874
sdb               0.00         0.00         0.00       1496          0
dm-0            139.00         0.19      1112.01     956514 5556997832
dm-1              0.00         0.00         0.00       2400          0
dm-2              0.00         0.00         0.00       2178         24

We can use another command line to get periodica.iostat updates iostat 10 -x
iostat 10 -x


avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          33.61    0.00    0.50    0.02    0.00   65.86

Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sda               0.00   132.62    0.00    7.36     0.19  1112.07   151.05     0.05    6.75    2.34    6.75   3.01   2.22
sdb               0.00     0.00    0.00    0.00     0.00     0.00     8.00     0.00    0.18    0.18    0.00   0.18   0.00
dm-0              0.00     0.00    0.00  139.01     0.19  1112.07     8.00     0.71    5.13    3.92    5.13   0.16   2.22
dm-1              0.00     0.00    0.00    0.00     0.00     0.00     8.00     0.00    1.42    1.42    0.00   0.60   0.00
dm-2              0.00     0.00    0.00    0.00     0.00     0.00     7.92     0.00    0.59    0.51    5.00   0.44   0.00


iostat.txt · Last modified: 2017/07/12 18:27 by walkeradmin