[Orca-users] Question regarding Statistical Calculations...

[Jon Tankersley]

This is a result of the rrdtool consolidation function that is used by
default by Orca - which is AVERAGE, so weekly is averaged again and drops
the peak value, as is monthly, yearly, etc.  We ran into this and have some
'hooks' that I'm trying to put together for Blair to allow you to specify in
the config line (instead of changing the source) how you want data to be
consolidated - currently with min, max, avg separately or all together or
max and avg together (our current default usage).  You then specify in the
plot section how you want to display the data.  I'm hoping to post it to
Blair fairly soon.

This also includes a change in the legend to make it clear that you are
using an average, min or max:
 % Usr        Curr Max:   20.091   Avg:  35.025   Min:  15.099   Max:
60.092
 % Usr        Curr Avg:   19.991   Avg:  34.714   Min:  15.099   Max:
64.012
 % Sys        Curr Max:    5.312   Avg:   8.127   Min:   2.091   Max:
12.209
 % Sys        Curr Avg:    5.102   Avg:   8.018   Min:   2.091   Max:
11.001

Here, the Curr XXX is the last data point (on the right of the graph) and
the other fields are the Avg, Min, and Max of the entire interval.
With this setup, the Weekly, Monthly, and Yearly graphs all have a retained
real peak.


-----Original Message-----
From: orca-users-bounces+jon.tankersley=eds.com at orcaware.com
[mailto:orca-users-bounces+jon.tankersley=eds.com at orcaware.com] On Behalf Of
Sadat Chowdhury
Sent: Wednesday, July 14, 2004 12:29 PM
To: orca-users at orcaware.com
Subject: [Orca-users] Question regarding Statistical Calculations...



We have been using the orca system on a solaris machine and so far we 
have been able to get the system to gather data and generate html/graphs.

The statistics from the graphs, however, look a bit confusing. Here are 
some values quoted:

Daily:
Disk...Max: 3.56
1 min avg Process in Run Queue: Max: 5.753
5 min avg Process in Run Queue: Max: 4.990
15 min avg Process in Run Queue: Max: 4.150

Weekly:
Disk....Max: 2.13
1 min avg Process in Run Queue: Max: 3.901
5 min avg Process in Run Queue: Max: 3.966
15 min avg Process in Run Queue: Max: 3.966

The statistics generated for daily and weekly are from the same data 
set. They were both generated at the same time. How come the weekly max 
values are LOWER than the daily max values, when in fact, one would 
expect them to be at least the same or higher? For instance, if on 
Monday the max is 5.753 for any measure, for the entire week, it can't 
possibly be 3.901 - it has to be at least 5.753 or more (say of the max 
on Friday was 7.901).

Is there a reasonable explanation? anyone else experienced this?

-Sadat.

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