Difference between revisions of "Iostat"

From Linuxintro
imported>ThorstenStaerk
(New page: iostat is a program that shows how many I/O operations happen in a specified timeframe. = Install it = To install iostat, install the package sysstat. For example with SUSE Linux 11.3...)
 
imported>ThorstenStaerk
(iostat -xmt)
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</pre>
 
</pre>
 
You will get a new block every 10 seconds in this case.
 
You will get a new block every 10 seconds in this case.
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 +
Zoom in to one device, 1 second interval:
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<pre>
 +
# iostat -xmt 1 -d /dev/sda
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Linux 2.6.34.7-0.7-desktop (tweedleburg)        03/03/11        _x86_64_        (8 CPU)
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 +
03/03/11 08:46:33
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Device:        rrqm/s  wrqm/s    r/s    w/s    rMB/s    wMB/s avgrq-sz avgqu-sz  await  svctm  %util
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sda              0.03    1.63    0.06    0.72    0.00    0.01    26.56    0.08  108.28  4.64  0.36
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 +
03/03/11 08:46:34
 +
Device:        rrqm/s  wrqm/s    r/s    w/s    rMB/s    wMB/s avgrq-sz avgqu-sz  await  svctm  %util
 +
sda              0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00    0.00  0.00  0.00
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</pre>

Revision as of 07:42, 3 March 2011

iostat is a program that shows how many I/O operations happen in a specified timeframe.

Install it

To install iostat, install the package sysstat. For example with SUSE Linux 11.3 you open a console and enter:

yast -i sysstat

Run it

Just call IOstat plus the time interval in seconds:

# iostat 10
Linux 2.6.34.7-0.5-desktop (tweedleburg)        12/11/10        _x86_64_        (8 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.67    0.00    0.17    0.07    0.00   99.09

Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
sdb               1.35         5.76        28.55    1387011    6870465
sda               1.35         5.56        28.55    1337701    6870465
md126             4.26        11.32        28.38    2723674    6830024

You will get a new block every 10 seconds in this case.

Zoom in to one device, 1 second interval:

# iostat -xmt 1 -d /dev/sda
Linux 2.6.34.7-0.7-desktop (tweedleburg)        03/03/11        _x86_64_        (8 CPU)

03/03/11 08:46:33
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.03     1.63    0.06    0.72     0.00     0.01    26.56     0.08  108.28   4.64   0.36

03/03/11 08:46:34
Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await  svctm  %util
sda               0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00   0.00   0.00