[mrtg] Re: reducing interval below 5 minutes

Carl Friedberg friedberg at exs.esb.com
Wed May 15 05:05:33 MEST 2002


Thanks for your helpful and thoughtful reply, my comments mixed in:

-----Original Message-----
>From: PAUL WILLIAMSON [mailto:pwilliamson at mandtbank.com] 
>Sent: Tuesday, May 14, 2002 7:03 PM
>To: Carl Friedberg; mrtg at list.ee.ethz.ch
>Subject: [mrtg] Re: reducing interval below 5 minutes
>Yeah, make the refresh 300 seconds or more.
This should be documented (I don't believe it is).
>Or switch to RRDTool.
I don't know RRDTool, I'll look into that
>...the resolution of the graph...
1000 points for the 120 second interval seems fine (2.5x more data for
2.5x shorter intervals)
>... error correction...
This is an excellent point. Given the ability of computer hardware to
accurately measure time, this should not be a big deal, but a start
would be to trigger the next "event" at the start of the current event
plus a time lapse, e.g. trigger collections at 15:00:00.00, 15:02:00.00,
etc. Of course there are going to be both systematic and random
variations here, and perhaps this is the limit that one can achieve with
MRTG (I assume that the engineers who designed this gave some thought to
making 5 minutes the interval, so mucking with that might not be a good


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