[rrd-users] Re: RRD general info about length of storage

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Wed Feb 13 02:21:01 MET 2002

Clay Jones wrote:
> Is it correct that the RRD would contain 1 year's worth of data points if I
> specify an RRA with a yearly average?  Is keeping 1 year's work of 5 minute
> data points the only way to generate a yearly average graph?


It works like this:
 - The database is working on intervals of "x" seconds.  The default is 300.
 - Each RRA works on a certain amount of intervals per slot
 - Each RRA has a certain amount of slots

Suppose the database works with intervals of 300 seconds, the RRA works
with slots of 12 intervals, this would mean that each slot is worth
3600 (12*300) seconds of data (this is an hour).  If you store enough
of those slots (366*24), you can display one year of data.

You could also work with an RRA of 288 intervals.  This stores 86400
seconds per slot (one day) and you'd need 366 of such intervals.

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