how to identified this iostat value


 
Thread Tools Search this Thread
Operating Systems AIX how to identified this iostat value
# 1  
Old 04-22-2009
how to identified this iostat value

Hi All AIX expert
i'm using AIX 5.2
When i execute this command which is :

----------------------------------------------------------------------
>> iostat -a

System configuration: lcpu=4 disk=30

tty: tin tout avg-cpu: % user % sys % idle % iowait
0.1 7.9 80.6 2.0 17.1 0.4
" Disk history since boot not available. "

----------------------------------------------------------------------

In linux, if the % idle is below 20%, then the explanation is "If '%idle' goes below 20%, the system maybe queuing up disk I/Os and response time suffers."

But i'm not sure with AIX, what does that % idle represent and the rest such as % user and % iowait....

When i have above read, does that mean my disk I/O in a danger situation??
# 2  
Old 04-22-2009
from the man page:

Code:
       % user
            Shows the percentage of CPU utilization that occurred while executing at the user level (application).
       % sys
            Shows the percentage of CPU utilization that occurred while executing at the system level (kernel).
       % idle
            Shows the percentage of time that the CPU or CPUs were idle and the system did not have an outstanding disk I/O request.
       % iowait
            Shows the percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O request.

your machine is running a cpu-intensive application, low kernel activity, almost no wait for io
# 3  
Old 04-30-2009
Is this a database box - maybe oracle - with CIO enabled or using raw devices and/or using async IO a lot?
Your output looks healthy if this is a peak time of the day - you should still monitor cpu it if goes up in peak times - eg during batches - and as IBM states, if you see all the time cpu usage above 80% you might want to think about adding one to avoid problems in times of high usage ...
I would like to see the output of vmstat -I 5 5 too if you dont mind ?

Kind regards
zxmaus
Login or Register to Ask a Question

Previous Thread | Next Thread

8 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Perl to identify specific runs in input and print only lines identified

In the perl one-liner below I am identifying the runs of 6a or 6A in each line starting with >. The code seems close but it prints each > line no matter if it has 6a or 6A in it. Only the line with the 6a or 6A needs to be printed. So using the input file, only the >hg19_refGene_NM_001918_3... (10 Replies)
Discussion started by: cmccabe
10 Replies

2. AIX

Help with iostat

Hello, I support Oracle 11g on AIX 7.1. Using the command $iostat -D hdisk2 hdisk4 hdisk5 5 I get the following output: hdisk5 xfer: %tm_act bps tps bread bwrtn 44.0 1.4M 178.2 1.4M 14.7K read: ... (3 Replies)
Discussion started by: oracledba1024
3 Replies

3. Solaris

How to use IOSTAT command

Hello everyone, Can you please explain me what kind of information do IOSTAT show ? iostat -xnz 3 show me those informations: The I/O of the c0t0d0 disk is normal ? extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 0.0 ... (3 Replies)
Discussion started by: adilyos
3 Replies

4. Solaris

iostat -En errors

I all, I would like to know what are the causes of : -soft error -harderror -transport error and how to avoid and repare them. I got the iostat out put below: atng-mm01% iostat -En | grep -i hard c0t0d0 Soft Errors: 1 Hard Errors: 0 Transport Errors: 0 c0t0d1 ... (3 Replies)
Discussion started by: zaza
3 Replies

5. Red Hat

iostat on Redhat 5

A find for the "iostat" command on a redhat 5 update 4 comes back with no results. Any separate rpm needs to be installed to get the binary for this ? Thanks in advance. (1 Reply)
Discussion started by: uxadmin007
1 Replies

6. Shell Programming and Scripting

iostat on solaris

Friends. I have to compare iostat -x output with a tool on solaris. Now there is column called wait in the output field which is showing zero. Now, in order to create some load on my system this is what i am doing I am creating a file using dd command , the size of which is... (5 Replies)
Discussion started by: achak01
5 Replies

7. Solaris

iostat -Eni

Sorry for asking basics. What exactly is the situation if device ID is same in iostat -Eni. What we must do then? Is there any relation b/w iostat and cfgadm? (3 Replies)
Discussion started by: mayahari
3 Replies

8. Filesystems, Disks and Memory

Help with iostat ...

All, I am attempting to help tune a Sun for better performance (mainly for SAS 9.1), and have found indicators pointing to poor I/O utilization. I have run iostat -cx, and found one device in particular where the %w is in the 90's during processing. I have a feeling that this is where the SAS... (3 Replies)
Discussion started by: dj_is
3 Replies
Login or Register to Ask a Question