[rrd-users] Re: A doubt on RRD database

[McCann, Brian]

	If I may add, this is why it helps to know how you are going to
want to analyze the data up-front.  For example, we have several RRAs,
holding various size samples for periods of 8 hours, 28 hours, 8 days,
35 days, and 380 some days.  This way, we can get a fairly good estimate
for any data period we would like, up to a year ago.  It took some
tuning to get this to work right, and it wasn't magic..and in fact quite
a few of our RRAs are still giving some horrible averages, but we're
patiently working through them.  It just requires a lot of time, logic,
and staring at examples. :)

--Brian

-----Original Message-----
From: rrd-users-bounce at list.ee.ethz.ch
[mailto:rrd-users-bounce at list.ee.ethz.ch] On Behalf Of Serge Maandag
Sent: Wednesday, January 26, 2005 9:48 AM
To: nero freak
Cc: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] Re: A doubt on RRD database

> So RRD is a FIFO. Is this a file-based DB?

Yes.

> Looked at the docs and it says that we can define the database size at

> creation time. By this, if I define a size for x samples during a 
> month, then after a month, the saved data will be overwritten with new

> collected data for the following month. In this situation how can I 
> analize the flow for, e. g., 5 months?
> 


Well it's a FIFO, so everytime a value is added the oldest value Gets
shifted out.

say your RRA holds 5 minute samples for a month, starts at
2000-01-01 00:00:00 and ends at 2000-01-31 23:55:00.

Then after an update on 2000-02-01 00:00:00, the RRA will start at
2000-01-01 00:05:00 and end at 2000-02-01 00:00:00.

And this is valid for every RRA.

Serge.

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