[rrd-users] Re: Quick heartbeat, step and update question

[Alex van den Bogaerdt]

Vishal Suri wrote:

> If the heartbeat is 600 and the step time is 300; what happens to the
> updates that might show up between the 5 intervals? In other words if the
> cron job runs every 5 minutes and was started at 10:02, would the RRD be
> updated with this value or does it expect only to be updated at the
> intervals such as 10:00, 10:05 and so forth. Any help will be appreciated.

The updates are, after normalizing them, placed at a whole number times
the step size.  N * 300 in your case, which translates into 10:00, 10:05.

> The reason for this question is that even though there is no error being
> reported by the update command in the perl script, when I dump the database,
> i see none of those values. All i see is the intervals that I mentioned
> above and NaN as the value.

There can be other reasons for this:
- you are looking at the wrong part of the dump; are you really seeing
  NaN values and nothing else?  When you start your database, much of
  it content will be in the past and you have not updated the past
- you have set minimum and maximum values and the updates are outside
  these values

The examples in the tutorial should work.  Try them.

cheers,
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