[rrd-users] Re: Creating RRD/RRA

[Alex van den Bogaerdt]

On Wed, May 11, 2005 at 05:22:43PM -0400, Mike M wrote:
> > There is no "--step", something you probably want.
> > The default of 300 seconds is now used.
> 
> Okay, I understand this.  So then for 1-hour increments, I need to set
> this to 3600, right?

Yep.

> > The heartbeat is set to 3600 so you need updates >at_most< 3600
> > seconds apart.
> 
> This should be okay - I'm planning on writing a shell script that runs
> from cron hourly to update the database.  Is there any harm in making
> this a little less, maybe 3300?

Runs from cron, hourly.  A small delay, sometimes the system is
under load, sometimes not...

> > And what time is "N" ?  And the next "N" ?  How far are they apart?
> 
> Isn't "N" = now?  The other two values (876123:987123) are the
> document counts, the first for the "webdocs" datasource, the second

... let's say the following is true:

now == around 12:00 METDST today == 1115805601 seconds since epoch
now == around 13:00 METDST today == 1115809202 seconds since epoch
now == around 14:00 METDST today == 1115812800 seconds since epoch
now == around 15:00 METDST today == 1115816401 seconds since epoch

Assume step == 3600 and heartbeat == 3600.  What do you think
happens at time 1115809202 (_around_ 13:00) ?  And at 1115816401 ?
And why?

What do you think if heartbeat is set to 3300 ?  Why ?

Alex

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