Difference between revisions of "Iostat"

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<code>[[wikipedia:iostat|iostat]]</code>(input/output statistics) is a computer system [[monitor]] tool used to collect and show operating system storage input and output statistics.
  
  
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== See also ==
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Usage:
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{{io performance commands}}
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* <code>iostat</code>
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* <code>iostat -x</code>, includes among other information <code>%util</code> column. <code>[[sar]] -d</code> also display <code>%util</code> information.
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** <code>iostat -x 1 -m</code>
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* <code>iostat -xc</code>
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-c    Display the CPU utilization report
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* iostat: Add --compact option.
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Example:
 +
 
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* <code>iostat -x</code>
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<pre>
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Linux 4.15.0-66-generic (server_name_1) 01/06/2019 _x86_64_ (12 CPU)
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avg-cpu:  %user  %nice %system %iowait  %steal  %idle
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          26.69    0.09    5.45    2.81    0.00  64.95
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Device            r/s    w/s    rkB/s    wkB/s  rrqm/s  wrqm/s  %rrqm  %wrqm r_await w_await aqu-sz rareq-sz wareq-sz  svctm  %util
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loop0            0.00    0.00      0.00      0.00    0.00    0.00  0.00  0.00    0.03    0.00  0.00    2.49    0.00  0.00  0.00
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loop1            0.00    0.00      0.00      0.00    0.00    0.00  0.00  0.00    0.11    0.00  0.00    10.11    0.00  0.00  0.00
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loop2            0.08    0.00      0.08      0.00    0.00    0.00  0.00  0.00    0.46    0.00  0.00    1.07    0.00  0.01  0.00
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loop3            0.07    0.00      0.07      0.00    0.00    0.00  0.00  0.00    0.23    0.00  0.00    1.03    0.00  0.01  0.00
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loop4            0.00    0.00      0.00      0.00    0.00    0.00  0.00  0.00    0.00    0.00  0.00    2.50    0.00  0.00  0.00
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sda              9.24  13.63    61.04    338.74    2.22    5.29  19.36  27.97    0.22    0.37  0.01    6.61    24.85  0.09  0.20
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sdb            62.13  185.19  10293.49  7751.52    0.93    0.95  1.47  0.51    1.70  17.34  3.32  165.69    41.86  0.42  10.46
 +
sdc            46.22  203.85  9157.51  10073.27    0.91    0.57  1.94  0.28    1.59  17.32  3.60  198.14    49.42  0.44  11.11
 +
sdd            59.95    9.98  10592.98  9774.97    0.20    3.44  0.34  25.63    1.62  173.61  1.83  176.71  979.46  1.75  12.21
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dm-0          110.19  301.03  19451.00  28437.01    0.00    0.00  0.00  0.00    1.88    7.24  2.39  176.52    94.47  0.44  18.29
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</pre>
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%rrqm The percentage of read requests merged together before being sent to the device.
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== Related commands ==
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* <code>[[iotop]]</code>
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* <code>[[nfsiostat]]</code>
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* [[Device mapper]]
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==See also==
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* <code>[[hdparm]]</code>
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*  <code>[[nice]]</code> and <code>[[ionice]]</code>
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* [[Performance]]: {{io performance commands}}
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* {{sysstat}}
  
  
 
[[Category:Linux]]
 
[[Category:Linux]]
 
[[Category:Linux commands]]
 
[[Category:Linux commands]]

Latest revision as of 09:42, 18 April 2023

iostat(input/output statistics) is a computer system monitor tool used to collect and show operating system storage input and output statistics.


Usage:

  • iostat
  • iostat -x, includes among other information %util column. sar -d also display %util information.
    • iostat -x 1 -m
  • iostat -xc
-c     Display the CPU utilization report
  • iostat: Add --compact option.

Example:

  • iostat -x
Linux 4.15.0-66-generic (server_name_1) 	01/06/2019 	_x86_64_	(12 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
          26.69    0.09    5.45    2.81    0.00   64.95

Device            r/s     w/s     rkB/s     wkB/s   rrqm/s   wrqm/s  %rrqm  %wrqm r_await w_await aqu-sz rareq-sz wareq-sz  svctm  %util
loop0            0.00    0.00      0.00      0.00     0.00     0.00   0.00   0.00    0.03    0.00   0.00     2.49     0.00   0.00   0.00
loop1            0.00    0.00      0.00      0.00     0.00     0.00   0.00   0.00    0.11    0.00   0.00    10.11     0.00   0.00   0.00
loop2            0.08    0.00      0.08      0.00     0.00     0.00   0.00   0.00    0.46    0.00   0.00     1.07     0.00   0.01   0.00
loop3            0.07    0.00      0.07      0.00     0.00     0.00   0.00   0.00    0.23    0.00   0.00     1.03     0.00   0.01   0.00
loop4            0.00    0.00      0.00      0.00     0.00     0.00   0.00   0.00    0.00    0.00   0.00     2.50     0.00   0.00   0.00
sda              9.24   13.63     61.04    338.74     2.22     5.29  19.36  27.97    0.22    0.37   0.01     6.61    24.85   0.09   0.20
sdb             62.13  185.19  10293.49   7751.52     0.93     0.95   1.47   0.51    1.70   17.34   3.32   165.69    41.86   0.42  10.46
sdc             46.22  203.85   9157.51  10073.27     0.91     0.57   1.94   0.28    1.59   17.32   3.60   198.14    49.42   0.44  11.11
sdd             59.95    9.98  10592.98   9774.97     0.20     3.44   0.34  25.63    1.62  173.61   1.83   176.71   979.46   1.75  12.21
dm-0           110.19  301.03  19451.00  28437.01     0.00     0.00   0.00   0.00    1.88    7.24   2.39   176.52    94.47   0.44  18.29

%rrqm The percentage of read requests merged together before being sent to the device.

Related commands[edit]

See also[edit]

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