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Full Discussion: IBM AIX I/O Performance Tuning
Operating Systems AIX IBM AIX I/O Performance Tuning Post 303031803 by bakunin on Wednesday 6th of March 2019 03:25:16 AM
Old 03-06-2019
Quote:
Originally Posted by c3rb3rus
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?
I would not (at least not without imminent pressure to do so) change the "max_transfer" property of the hdisk. If you use disks (that includes virtual disks) AIX (or, rather, the driver it uses) recognizes this is alreay set up fairly. You should change the HBAs property "max_xfer_size", though: optimal values depend on the "environment" of the other components involved so that the driver cannot estimate it.

I have successfully used a value of 0x400000 in a similar surrounding so i'd start in your case with probably a value of 0x800000, test that thoroughly and eventually go back to 0x400000 if it doesn't work out.

I hope this helps.

bakunin
Last edited by bakunin; 03-06-2019 at 05:16 AM..
 

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LEARN ABOUT CENTOS

dsktune

DSKTUNE(1)						      General Commands Manual							DSKTUNE(1)

NAME

       dsktune - reports memory, network, and file system tuning settings which can affect the performance of the Directory Server

SYNOPSIS

       dsktune [-q] [-c] [-D] [-v] [-i installdir]

DESCRIPTION

       Reports memory, network, and file system tuning settings which can affect the performance of the Directory Server

OPTIONS

       A summary of options is included below:

       -q     dsktune only reports essential settings

       -c     dsktune only reports tuning information for client machines

       -D     dsktune also reports the commands executed

       -v     dsktune only reports its release version date

       -i installdir
	      specify alternate server installation directory

AUTHOR

       dsktune was written by the 389 Project.

REPORTING BUGS

       Report bugs to http://bugzilla.redhat.com.

COPYRIGHT

       Copyright (C) 2001 Sun Microsystems, Inc. Used by permission.
       Copyright (C) 2008 Red Hat, Inc.
       This manual page was written by Michele Baldessari <michele@pupazzo.org>, for the Debian project (but may be used by others).
       This is free software.  You may redistribute copies of it under the terms of the Directory Server license found in the LICENSE file of this
       software distribution.  This license is essentially the GNU General Public License version 2 with an exception for plug-in distribution.

								   May 18, 2008 							DSKTUNE(1)
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