Solved

AIX Disk performance

Posted on 2010-11-10
4
793 Views
Last Modified: 2012-06-27
I have AIX machine that started working very slow, running topas show that one of the disks is almost always 100% busy. How can I find out which processes causing this?

Thanks,
Tal
0
Comment
Question by:questil
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
4 Comments
 
LVL 68

Accepted Solution

by:
woolmilkporc earned 500 total points
ID: 34101253
This sounds quite like a paging problem.
Does the disk in question contain a paging space? Issue "lsps -a" to find out.
If there is a paging space on it, check with topas the values for PgspIn, PgspOut, MEMORY, PAGING SPACE.
What do you see?
If there is no paging space on the disk, start topas and hit "F". Hopefully your AIX is new enough, so you can at least see which filesystem is causing the high I/O load.
Please let me know what you found!
wmp
0
 
LVL 25

Expert Comment

by:madunix
ID: 34101307
Displaying top CPU_consuming processes:
#ps aux | head -1 ;  ps aux | sort -rn +2 | head -10;topas -P

Displaying top 10 memory-consuming processes:
#ps aux | head -1; ps aux | sort -rn +3 | head

Displaying the process in order of real memory use
#ps vx | head -1; ps vx | grep -v PID | sort -rn +6 | head -10

Displaying the process in order of I/O
#ps vx | head -1; ps vx | grep -v PID | sort -rn +4 | head -10

0
 
LVL 68

Assisted Solution

by:woolmilkporc
woolmilkporc earned 500 total points
ID: 34101345
Run "topas -P" and order the columns using the left and right arrow keys, that's faster and easier.
0
 

Author Closing Comment

by:questil
ID: 34101571
Yes, woolmilkporc, the disk contain paging space, but we had to restart the system from other reasons...

Thanks!
0

Featured Post

Use Case: Protecting a Hybrid Cloud Infrastructure

Microsoft Azure is rapidly becoming the norm in dynamic IT environments. This document describes the challenges that organizations face when protecting data in a hybrid cloud IT environment and presents a use case to demonstrate how Acronis Backup protects all data.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Little introduction about CP: CP is a command on linux that use to copy files and folder from one location to another location. Example usage of CP as follow: cp /myfoder /pathto/destination/folder/ cp abc.tar.gz /pathto/destination/folder/ab…
Java performance on Solaris - Managing CPUs There are various resource controls in operating system which directly/indirectly influence the performance of application. one of the most important resource controls is "CPU".   In a multithreaded…
Learn how to find files with the shell using the find and locate commands. Use locate to find a needle in a haystack.: With locate, check if the file still exists.: Use find to get the actual location of the file.:
Connecting to an Amazon Linux EC2 Instance from Windows Using PuTTY.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question