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Operating Systems AIX IBM AIX I/O Performance Tuning Post 303032108 by rowswell on Monday 11th of March 2019 05:05:14 PM
Old 03-11-2019
Hi - as you can see in your results the xdisk tool with 1 MB block size drove the V7000 up to 3.4 Gigabytes per second.
The reason I mentioned using 0x40000 for the hdisk max_transfer is because that is what the SDDPCM driver used by default and I have seen better V7000 performance with this value compared to the 0x80000 default that AIX MPIO uses.
You can leave the FC adapter at 0x100000 or you could change it to 0x200000. This tunable is independent of the hdisk one.

If you do reduce the hdisk max_transfer from 0x80000 to 0x40000 you can then compare the xdisk results now that you have already run it once.

Thanks
Dean

--- Post updated at 09:05 PM ---

Regarding your question of tuning max_xfer_size you can do it dynamically assuming your LUN's have multiple paths. (lspath to confirm)
Code:
rmdev -l fscsiX -R
chdev -l fcsX -a max_xfer_size=0x200000
cfgmgr

 

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tuned-main.conf(5)				      tuned-main.conf file format description					tuned-main.conf(5)

NAME
tuned-main.conf - Tuned global configuration file SYNOPSIS
/etc/tuned/tuned-main.conf DESCRIPTION
This man page documents format of the Tuned global configuration file. The tuned-main.conf file uses the ini-file format. dynamic_tuning=BOOL This defines whether the dynamic tuning is enabled. It is boolean value. It can be True or 1 if the dynamic tuning is enabled and False or 0 if disabled. In such case only the static tuning will be used. Please note if it is enabled here, it is still possible to individually disable it in plugins. sleep_interval=INT Tuned daemon is periodically waken after INT seconds and checks for events. By default this is set to 1 second. If you have Python 2 interpreter with applied patch from Red Hat Bugzilla #917709 this controls responsiveness time of Tuned to commands (i.e. if you request profile switch, it may take up to 1 second until Tuned reacts). Increase this number for higher responsiveness times and more power savings (due to lower number of wakeups). In case you have unpatched Python 2 interpreter, this settings will have no visible effect, because the intepreter will poll 20 times per second. update_interval=INT Update interval for dynamic tuning (in seconds). Tuned daemon is periodically waken after INT seconds, updates its monitors, calcu- lates new tuning parameters for enabled plugins and applies the changes. Plugins that have disabled dynamic tuning are not pro- cessed. By default the INT is set to 10 seconds. Tuned daemon doesn't periodically wake if dynamic tuning is globally disabled (see dynamic_tuning) or this setting set to 0. This must be multiple of sleep_interval. EXAMPLE
dynamic_tuning = 1 sleep_interval = 1 update_interval = 10 FILES
/etc/tuned/tuned-main.conf SEE ALSO
tuned(8) AUTHOR
Written by Jaroslav karvada <jskarvad@redhat.com>. REPORTING BUGS
Report bugs to <power-management@lists.fedoraproject.org>. Jaroslav karvada 15 Oct 2013 tuned-main.conf(5)
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