[rrd-users] Re: Help Setting Up RRDatabase

Alex van den Bogaerdt alex at ergens.op.het.net
Thu Oct 16 00:18:00 MEST 2003

On Wed, Oct 15, 2003 at 02:54:59PM -0400, Blake Crosby wrote:
> I'm havng difficulty understanding the relationship between heartbeat and
> step.

Don't look for a close relationship; there isn't.

> I have 4 values that I would like to place in the rrd database every 30 min
> (11 and 44 minutes past each hour). However I would like the graph to be as
> smooth as possible (especially when only 24-36 hours worth of data is
> displayed).
> I'm assuming id set up the step to be 300 seconds (5 minutes) and the
> heartbeat to be 1800 seconds (30 minutes). This way rrdtool will average the
> values between the 30 minute updates.

Why?  If you're going to set step to 300 and update every 6*300 seconds,
all you achieve is that you'll be updating 6 intervals in one command.

There's no smoothing going on.

You're right about the heartbeat, although I'd set it to something larger
than 1800 (say 2000 or so).

> When I create the rrdatabase then do a dump, each row is a multiple of 5
> minutes (regardless of what time the --start value is). Since I am updating
> the database at 11 and 44 minutes past each hour are those values going to
> get lost?

Plenty of information available on the normalizing process so I won't
repeat that.  Please google for it.


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