[mrtg] heartbeat

Alex van den Bogaerdt alex at ergens.op.het.net
Wed Jun 27 16:51:24 CEST 2007

On Wed, Jun 27, 2007 at 12:22:15PM +0200, Matthias Laug wrote:

> I want to update my rrd database once a day with 24 values. So one for each
> hour.
> so I created this:
> rrd create --step 3600 myrrd.rdd DS:cputime:Counter:??????:U:U
> [...]
> what should be the value for heartbeat, so that my values are not set to
> unknown, or does the update overwrite such settings?

The way it is supposed to work (or so I think):  The current update
time, minus the last update time, should not exceed the heartbeat

This translates to: if you want to update once a day, on exactly
the same time each day, you need to set heartbeat to
25 * 3600 = 90000.  Why 25 hours?  Because of daylight saving.

Alex van den Bogaerdt

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