[rrd-users] Re: Changing Average value in SRG.conf to MAX

Alex van den Bogaerdt alex at ergens.op.het.net
Thu Dec 7 19:03:50 MET 2006

On Thu, Dec 07, 2006 at 11:46:41AM -0400, Edgar Humberto Parra wrote:

> I have almost a year worth of data in my RRD files, and my manager asked
> me, if I can change the value of the graphic value of RRA from AVERAGE
> to MAX, what are the consequences of doing this?

If you currently have no MAX RRA, you cannot recover that data.  The
consolidation process has already computed averages and stored those.

> I am using RRDTOOL with an application called Spectrum Report Gateway
> Do I have to modify only the value of RRD:AVERAGE:0:5:288:797 to
> RRD:MAX:0:5:288:797 in SRG.conf file and that's it? Or are there other
> considerations to take care of? What will it happen to my rrd files
> containing 1 year of data?

If you have questions about tht SRG program, you probably should
ask them (or a mailing list, or whatever they have). Maybe they
have a script to add new RRAs to your RRD (such scripts do exist).

What you really want to avoid is that you have to start all over
again.  I would not be surprised if such a program will create a
new database when it notices an incompatibility.  On the other hand,
I would also not be surprised if it does not create a new database
unless you manually remove the old one.

If you can change AVERAGE into MAX in the RRD, it will *seem* as if
you suddenly have a year's worth of maxima, but in reality this is
not the case.  Any new data will be true maxima.

Alex van den Bogaerdt

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