[rrd-users] Best way to track absolute data.

Shem Valentine rrdtool at valentinenews.net
Mon Feb 1 18:38:45 CET 2010

Sorry for the double post.  After reading the email several more times, I 
realized it doesn't make much sense.

I am looking to create an RRD with a 3-month and a 5-year archive.  I have 
a counter which is retrieved and reset every 30-minutes.  The data needs to 
be accurate for the 5-year archive and not an average.  I would like to 
keep the file size to a minimum (ie not store 30-min records for 5 years).

Perhaps the best way to explain is with a sample.

rrdtool create file.rrd --step 1800 \ 
DS:30min:ABSOLUTE:3600:0:U \
DS:10hour:(take last 20 30min PDP's and total them) \

I would prefer to use something like COMPUTE for 10hour (don't know if this 
is possible).  However, as a last resort I could possibly cache the PDPs in 
the script I'm using then update 10hour with their total.  In which case 
would something like the following make sense?

rrdtool create file.rrd --step 1800 \ 
DS:30min:ABSOLUTE:3600:0:U \

Thanks again.

On Monday 01 February 2010 9:27:01 am Shem Valentine wrote:
> Hello all,
> I have an ABSOLUTE counter that I'm trying to monitor (resets after each
> read).  This counter is reset every 30 minutes.
> I'm trying to make my rrd files as minimal as possible, as I will be
> tracking thousands of these monitors.  So I would like to have a
>  30-minute archive for 3-4 months, and a 24-hour archive for 5 years.
> It is important to me that the RRD contains accurate data totals, and
>  not averaged.  The 30-minute archive is simple enough, an ABSOLUTE DS,
>  with a LAST RRA.  However, I'm struggling to get the 24-hour archive.
> I could do it similar to above, a 24-hour RRA using LAST, and have my
> script that gathers the PDPs, total them, and update an ABSOLUTE DS.
> I was wondering if anyone had any ideas if it is possible, and if so,
>  how to accomplish this using RRD,
> Thank you for your time,
> -Shem Valentine
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