[rrd-users] Re: RRA selection

[Dan Winslow]

Ahh. ok. I bet its the step switch, right? If I specify a step of 1 day, it
will choose the second RRA?

-----Original Message-----
From: rrd-users-bounce at list.ee.ethz.ch
[mailto:rrd-users-bounce at list.ee.ethz.ch]On Behalf Of Alex van den
Bogaerdt
Sent: Friday, September 07, 2001 9:47 AM
To: Dan Winslow
Cc: RRD users
Subject: [rrd-users] Re: RRA selection



Dan Winslow wrote:

> Given a definition like :
>
> rrdtool create test.rrd -s 900
> DS:inutil:GAUGE:1800:0:200
> DS:oututil:GAUGE:1800:0:200
> RRA:AVERAGE:0.5:1:35040
> RRA:AVERAGE:0.5:96:365
>

[snip]

> Which RRA is being plotted by the above statement? Both?

It depends.  What is the best match:

If the data you ask for is available in the first RRA (the one with
the smaller intervals) then this one will be used.

When you ask for more than one days worth of data, the request
cannot be satisfied by the first RRA.  The second RRA will be
used.  Any interval not (yet) available in that RRA will be read
as unknown.

cheers,
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