Not fit sysstat version >= 11

[duke5]

With CentOS 8.3 built-in sysstat version is 11.7.3-5.el8
sub items does not work

[t2y]

Thank you for reporting.

I confirmed iostat outputs on CentOS 8.3.

$ lsb_release -a
LSB Version:	:core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID:	CentOS
Description:	CentOS Linux release 8.3.2011
Release:	8.3.2011
Codename:	n/a

$ uname -ar
Linux localhost.localdomain 4.18.0-240.1.1.el8_3.x86_64 #1 SMP Thu Nov 19 17:20:08 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

$ iostat -V
sysstat version 11.7.3
(C) Sebastien Godard (sysstat <at> orange.fr)

$ iostat -ymxt 1 
Linux 4.18.0-240.1.1.el8_3.x86_64 (localhost.localdomain) 	09/24/2021 	_x86_64_	(1 CPU)

09/24/2021 11:45:19 AM
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.00    0.00    0.00    0.00    0.00    0.01

Device            r/s     w/s     rMB/s     wMB/s   rrqm/s   wrqm/s  %rrqm  %wrqm r_await w_await aqu-sz rareq-sz wareq-sz  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     0.00     0.00   0.00   0.00

There was below log format when I made this tool. It seems the log format was changed in new iostat version.

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sdd               0.07    45.88    1.57    0.59     0.08     0.18   246.55     0.26  121.04    1.28  436.94   2.07   0.45
sdh               0.07    45.78    1.59    0.60     0.08     0.18   245.64     0.22  101.97    1.17  367.51   1.89   0.41
sdb               0.25    74.42    5.70    0.87     0.57     0.29   268.00     0.32   49.24   38.06  123.00   1.83   1.20

[t2y]

The iostat-tool parser expects Device: as an identifier, but the new iostat version outputs Device. There is no :(colon).

Then, I found there are new columns.

• aqu-sz
• rareq-sz
• wareq-sz
• %rrqm
• %wrqm

There are no columns in the new iostat version output.

• avgrq-sz
• avgqu-sz
• await

[t2y]

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

              %wrqm
                     The percentage of write requests merged together before being sent to the device.

              areq-sz
                     The average size (in kilobytes) of the I/O requests that were issued to the device.
                     Note: In previous versions, this field was known as avgrq-sz and was expressed in sectors.

              rareq-sz
                     The average size (in kilobytes) of the read requests that were issued to the device.

              wareq-sz
                     The average size (in kilobytes) of the write requests that were issued to the device.

              aqu-sz
                     The average queue length of the requests that were issued to the device.
                     Note: In previous versions, this field was known as avgqu-sz.

[t2y]

I fixed it in 0.3.0. Tell me if you still have some trouble.

• https://pypi.org/project/iostat-tool/0.3.0/