iostat performance monitoring 2

[spamly]

Have you seen any issues with enabling collections of disk input/output statistics?

I'd like to enable stats with the following.

chdev -l sys0 -a iostat=true

I am a little hesitant because I read the following in the iostat man page.

Disk Input/Output History

To improve performance, the collection of disk input/output statistics
has been disabled. To enable the collection of this data, type:

chdev -l sys0 -a iostat=true

To display the current settings, type:

lsattr -E -l sys0 -a iostat

If the collection of disk input/output history is disabled and iostat
is called without an interval, the iostat output displays the message
Disk History Since Boot Not Available instead of disk statistics.

Any ideas?

 

[lpblauen]

I use nmon and have iostat=true. I have seen no impact when monitoring the system. I capture data and run it through the nmon analyzer all the time to see how the system is working. If you want to look at nmon go to the IBM web page and search for nmon. Download it and I think you will like it.

 

[hirschaj]

I enable this on my servers and have not really noticed an poor performance due to it being turned on. This data is usually very helpful.


Jim Hirschauer

http://www.aixexpert.com

 

[spamly]

Thanks for the responses!

I'm an nmon junky myself. I just wanted to see if anyone has seen any problems. Good to know it's working at other sites.

Thanks!
-me