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What is %idle means in SAR?

 
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# 8  
Old 01-01-2015
Quote:
Originally Posted by Scrutinizer
So are you saying that %usr %sys %wait and %idle do not add up to 100.. in an LPAR?
No, i did not say this and i didn't mean it either. In fact i haven't used - for the explained deficiencies - sar for the last 10 years on AIX machines. In fact i do not know why the numbers do not add up to 100%, but since sar is the wrong tool to use on LPARs anyway i don't care why this is so.

I know of (small) deviations from "100%" in vmstat and iostat, which is usually an artefact of rounding. The delta, though, is too big for being a rounding effect, so i don't know.

bakunin
# 9  
Old 01-02-2015
I'd usually use vmstat instead. The same risk of rounding errors, but it gives the entitled capacity % (which can burst over 100% if the LPAR is not limited) as below along with the paging/swap information that can be useful if the server is not performing as expected:-
Code:
> vmstat 3                      

System configuration: lcpu=2 mem=1024MB ent=0.10

kthr    memory              page              faults              cpu          
----- ----------- ------------------------ ------------ -----------------------
 r  b   avm   fre  re  pi  po  fr   sr  cy  in   sy  cs us sy id wa    pc    ec
 1  0 229548 14588   0   0   0   0    0   0  23  103 161 99  1  0  0  0.89 889.9
 1  0 229548 14588   0   0   0   0    0   0   2   16 151 99  0  0  0  0.89 892.0

I'd put in a tight while true loop for a few seconds just to generate load. I still can't explain why the original posted output exceeds 100% for user, system, idle & wait though Smilie



Robin
# 10  
Old 01-02-2015
Why loop when there is an interval switch e.g. vmstat 3 5 or something.
# 11  
Old 01-02-2015
I was just illustrating that the EC value can exceed 100%.
# 12  
Old 01-05-2015
Hi
here i want to know only what does %idle reflect?
is higher value of %idle is good
or lower value of %idle is good
# 13  
Old 01-05-2015
You need to say what good means in your context, as suggested by Don in post 5
# 14  
Old 01-05-2015
Quote:
Originally Posted by scriptor
is higher value of %idle is good
or lower value of %idle is good
Both are good. Actually any value of %idle comprised between 0% and 100% inclusive is good, i.e. shouldn't be a concern.
 
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