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)
can someone tell me a good site to go to in order to learn this. please do not recommen nay books because i dont have interest in that. if you know of any good sites with good straight forward explanation on how to split loads on machines that has excessive loading, please let me know
Also,... (1 Reply)
Hi all,
long time ago I posted something, but now, it is needed again :(
Currently, I am handling with a big NFS Server for more than 200 clients, this sever has to work with 256 NFSDs. Because of this huge amount of NFSDs, there are thousands of small write accesses down to the disk and... (3 Replies)
Hi to all,
I'm interested in finding an introduction about Performance Tuning under Unix (or Linux); can somebody please point me in the right direction?
Best regards (1 Reply)
Sorry,
This is out of scope of this group.But I require the clarification pretty urgently.
My Oracle database is parallely enabled.
Still,in a particular table queries do not work "parallely" always.
How is this? (9 Replies)
Hi All,
In last one week, i have posted many questions in this portal. At last i am succeeded to make my 1st unix script.
following are 2 points where my script is taking tooooo long.
1. Print the total number of records excluding header & footer. I have found that awk 'END{print NR -... (2 Replies)
Hi all,
From Googling, I found that the basics used for troubleshooting UNIX/AIX performance issues are commands like vmstat, iostat and sar. I believe these are generic commands regardless of what UNIX flavour is in used, only difference being is the format of the output.
In a real case... (2 Replies)
Please take a look at this system and give your analysis / advice. Can it be tuned to get a better performance?
We are not getting more hardware ressources at the moment.
We have to live with what we have. Application running on the system is SAS. OS is AIX 6.1
Let me know if you need output of... (7 Replies)
Dear all,
I have a Local zone , where users feel that performance is not good.
Is it wise to collect the inputs from the local zone rather than taking from the global zone.
And also Can I tune from Global zone , so that it will reflect in local zone.
Rgds
rj (2 Replies)
Overview:
Introduction
What Does Success Mean?
What Does Performance Mean?
Every Picture is Worth a Thousand Words
Work Like a Physicist
Work Like You Walk - One Step at a Time
Learn to Know Your System
Choose Your Weapons!
Tools of the Trade 1 - vmstat
A Little Theory Along the Way -... (1 Reply)
Discussion started by: bakunin
1 Replies
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)