[mrtg] Re: Basic question

[Matt Walkowiak]

MRTG's job is to grab numbers from sources that you tell it to get them
from.  So if the device (OID) you are polling (with SNMP) gives the 5 minute
average, then the spike will be reflected.  If, however, the number MRTG
gets is just a snapshot number, then the spike will not be reflected.
One of the biggest mistakes that MRTG newbies make is the assumption that
MRTG is "smart."  While it is an awesome tool (especially for how much it
costs :) for graphing the trends and getting baseline numbers, it cannot
tell you more about the device it is monitoring than the device can tell you
about itself.

opps! almost forgot... ahem... RTFM.  Thank you.

Ok, fine.  In this case, the best place to go RTFM'ing is here:
http://faq.mrtg.org/intro/mrtg2.html
Its pretty well written and kinda gives you the philosophy of MRTG and what
it can and cannot do for you.

blah...  Matt

-----Original Message-----
From: Adam Waltman [mailto:AWaltman at docHarbor.net]
Sent: Thursday, August 02, 2001 10:16 AM
To: MRTG (E-mail)
Subject: [mrtg] Basic question



Does mrtg, when run every 5 minutes, go out and collect a snapshot of what
is happening at 5 minute intervals and then average it or does it find out
what has been going on for the entire 5 minutes?  The reason I ask is that
if something were to spike the bandwidth in between the polling interval,
would that show up on the graphs?

Thanks,
Adam Waltman
Senior Network Engineer
docHarbor, Inc.
awaltman at docharbor.net


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