[mrtg] Re: Business Hours and 95%ile.

[Forthofer Russ]

Jay:
You are probably right that the "business hours only" is not for everyone.
I would agree that in using MRTG to look for anomalies in utilization you
want to look at the whole day.  However, IMHO, there are some cases where it
can be quite helpful to look only at the business day.  For example, if a
line is used primarily during business hours, average utilization across a
24-hour day is pretty meaningless.  Average utilization and 95th percentile
utilization across the business day, however, can be useful statistics,
especially in terms of gathering historical data and tracking growth.  If
the business day "average" is what is being sought (in my case it is), then
simply zeroing out the non-business hours does not resolve the issue, as the
zeroes would skew the average. 

Russ

-----Original Message-----
From: Jay Hennigan [mailto:jay at west.net]
Sent: Thursday, September 06, 2001 2:25 PM
To: Mark Pugh
Cc: mrtg at list.ee.ethz.ch
Subject: [mrtg] Re: Business Hours and 95%ile.



On Thu, 6 Sep 2001, Mark Pugh wrote:

> I'm currently using MRTG, RRD, and 14all to monitor all my border routers
for bandwidth usage.  I'd like to be able to customize the data collection
and/or reporting to get a business hours (8-5) usage graph and a weekly
95%ile usage graph.  Are there any suggestions?  I've done very little PERL
work before, but can usually manage my way through scripts.  Any help would
be appreciated.

An excellent 95th percentile package is available from

http://www.seanadams.com/95/

As far as business hours, I'm not sure what you're trying to do.  If you're
calling MRTG from cron, you can edit the crontab to only run it during
business hours.  You'll probably want the unknown-as-zero switch set in
your config file.

IMHO, the business hours idea doesn't seem like a good one for most people.
DOS attacks, viruses, etc. often occur and cause unusual traffic patterns
at all hours.  Generally, it's good to know about such things.  Perhaps RRD
can generate the daily graph with specified begin and end times?

-- 
Jay Hennigan - CCIE #7880 - Network Administration - jay at west.net
NetLojix Communications, Inc.  -  http://www.netlojix.com/
WestNet:  Connecting you to the planet.  805 884-6323


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