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Full Discussion: IBM AIX I/O Performance Tuning
Operating Systems AIX IBM AIX I/O Performance Tuning Post 303031793 by c3rb3rus on Wednesday 6th of March 2019 12:24:44 AM
Old 03-06-2019
Sorry for the delayed response, I have ran the xdisk bench and the output is below.

Code:
root@xxxxx:./bench.sh
    BS Proc AIO read% IO  Flag    IO/s   MB/s rMin-ms rMax-ms rAvg-ms   WrAvg wMin-ms wMax-ms wAvg-ms   WwAvg
    1M    4   0   100 R     -C    3071   3071   0.857    8.41    1.30    1.27     0.0     0.0     0.0     0.0
    1M    4   0    80 R     -C    2780   2780   0.846    3.94    1.39    1.30    1.16    3.71    1.56    1.51
    1M    4   0    80 S     -C    2753   2753   0.837    6.12    1.40    1.30    1.15    3.75    1.57    1.51
    1M    4   0     0 R     -C    1878   1878     0.0     0.0     0.0     0.0    1.19    4.43    2.06    2.03
    1M    4   0     0 S     -C    1768   1768     0.0     0.0     0.0     0.0    1.15    6.00    2.19    2.21
    1M    4   0   100 R     -C    3017   3017   0.816    13.9    1.32    1.27     0.0     0.0     0.0     0.0
    1M   10   0   100 R     -C    3164   3164   0.806    22.5    3.15    3.17     0.0     0.0     0.0     0.0
    1M   10   0   100 S     -C    3105   3105   0.001    17.4    3.21    3.18     0.0     0.0     0.0     0.0
    1M   10   0    80 S     -C    3426   3426   0.001    16.0    3.03    2.96    1.32    6.13    2.38    2.22
    1M   10   0    80 R     -C    3423   3423   0.971    19.1    3.02    2.96    1.32    7.93    2.43    2.24
    1M   10   0     0 R     -C    1890   1890     0.0     0.0     0.0     0.0    2.42    12.5    5.20    5.20
    1M   10   0     0 S     -C    1659   1659     0.0     0.0     0.0     0.0    2.54    11.0    5.94    5.89

The settings on the hdisk2 were updated to use shortest_queue with no_reserve policy.

Code:
root@xxxxx:lsattr -El hdisk2
algorithm       shortest_queue                                      Algorithm                        True+
reserve_policy  no_reserve                                          Reserve Policy                   True+

I did not modify the hdisk max_transfer size during this test as there was a suggestion made to change max_transfer (which is part of the hdisk) and max_xfer_size which is part of the fc hba - do I change both?

Below are current values and possible values.

Code:
root@xxxxx:lsattr -El hdisk2 | grep "max_transfer"
max_transfer    0x80000

root@xxxxx:lsattr -Rl hdisk2 -a max_transfer
0x20000
0x40000
0x80000
0x100000
0x200000
0x400000
0x800000
0x1000000

lsattr -Rl fcs2 | grep "max_xfer_size"
root@xxxxx:lsattr -El fcs2
max_xfer_size 0x100000   Maximum Transfer Size

root@xxxxx:lsattr -Rl fcs2 -a max_xfer_size
0x100000
0x200000
0x400000
0x800000
0x1000000

Thanks for your help.
 

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LEARN ABOUT MINIX

lsattr

LSATTR(1)						      General Commands Manual							 LSATTR(1)

NAME

       lsattr - list file attributes on a Linux second extended file system

SYNOPSIS

       lsattr [ -RVadlpv ] [ files...  ]

DESCRIPTION

       lsattr lists the file attributes on a second extended file system.  See chattr(1) for a description of the attributes and what they mean.

OPTIONS

       -R     Recursively list attributes of directories and their contents.

       -V     Display the program version.

       -a     List all files in directories, including files that start with `.'.

       -d     List directories like other files, rather than listing their contents.

       -l     Print the options using long names instead of single character abbreviations.

       -p     List the file's project number.

       -v     List the file's version/generation number.

AUTHOR

       lsattr was written by Remy Card <Remy.Card@linux.org>.  It is currently being maintained by Theodore Ts'o <tytso@alum.mit.edu>.

BUGS

       There are none :-).

AVAILABILITY

       lsattr is part of the e2fsprogs package and is available from http://e2fsprogs.sourceforge.net.

SEE ALSO

       chattr(1)

E2fsprogs version 1.44.1					    March 2018								 LSATTR(1)
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