• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 804
  • Last Modified:

AIX Disk performance

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
questil
Asked:
questil
  • 2
2 Solutions
 
woolmilkporcCommented:
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
 
madunixChief Information Security Officer Commented:
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
 
woolmilkporcCommented:
Run "topas -P" and order the columns using the left and right arrow keys, that's faster and easier.
0
 
questilAuthor Commented:
Yes, woolmilkporc, the disk contain paging space, but we had to restart the system from other reasons...

Thanks!
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now