Cacti RRD sizes

frist44 · Post by **frist44** » Fri Feb 13, 2009 2:35 pm

It's my understanding that Cacti collects 5 min buckets for a specified period of time and then generalizes it into much larger time segments to help save disk space. Is there something that can be done to allow cacti to retain 5 min. intervals for say 1000 days or something like that?

Post by **gandalf** » Fri Feb 13, 2009 3:15 pm

This is a feature of rrdtool, not of cacti. And yes, you may change those settings, see http://docs.cacti.net/?q=node/393
Reinhard

frist44 · Post by **frist44** » Fri Feb 13, 2009 3:25 pm

I tried to follow this, but I'm not getting any results for my new graph.

http://docs.cacti.net/?q=node/54

has anyone been through this successfully?

Post by **gandalf** » Fri Feb 13, 2009 3:32 pm

Sure. Please post more information
Reinhard

frist44 · Post by **frist44** » Fri Feb 13, 2009 3:37 pm

I ran through the steps, and I'm getting the graph, but not data is on it. I realize it may take a few days to fully populate, but the more concerning thing is that the rrd associated with the particular device is the same size as the previous rrd created when the normal time Interface statistics was chosen. Since I created an RRA to keep 5 min intervals for 1000 days, I was under the impression the file size of the rrd would be significantly larger on disk.

Is this true?

Post by **gandalf** » Fri Feb 13, 2009 3:41 pm

The file size will be larger, indeed. Please tell me how you've run this script and post all results
Reinhard

frist44 · Post by **frist44** » Fri Feb 13, 2009 3:52 pm

As I mentioned below, I didn't run a script, I followed this:

http://docs.cacti.net/?q=node/54

frist44 · Post by **frist44** » Fri Feb 13, 2009 4:09 pm

The only difference that I put in is the RRA sizes. I entered:

Steps = 1
Rows = 288000 -> 1000 days
Timespan = 777600000 -> 900 days

frist44 · Post by **frist44** » Fri Feb 13, 2009 4:13 pm

I deleted the device and tried it again and noticed that the first time the poller runs, it creates the rrd's. However the one with the larger interval isn't created.

Why wouldn't it create that one?

Post by **gandalf** » Fri Feb 13, 2009 4:36 pm

Please post DEBUG output for the data source from "Data Sources"
Reinhard

frist44 · Post by **frist44** » Fri Feb 13, 2009 5:03 pm

Data source Debug:

/usr/bin/rrdtool create \
/var/www/cacti/rra/pnm9_traffic_out_89.rrd \
--step 300 \
DS:traffic_in:COUNTER:600:0:100000000 \
DS:traffic_out:COUNTER:600:0:100000000 \
RRA:AVERAGE:0.5:1:288000 \

Post by **gandalf** » Sat Feb 14, 2009 7:19 am

And now a rrdtool info of the very same file to compare it to the requested file layout
Reinhard

frist44 · Post by **frist44** » Sat Feb 14, 2009 8:31 am

Well that's the thing, it never actually created the file on disk, so I can't see it. When you debug info on the interface traffic, it says the rrd file can not be found.

Why wouldn't it create it?

Post by **gandalf** » Sat Feb 14, 2009 8:44 am

This may be due to host down detection. Do other graphs work for this host?
Reinhard

frist44 · Post by **frist44** » Sat Feb 14, 2009 8:58 am

yeah they are all working fine. And I see their rrd's in the file system.

Cacti RRD sizes

Cacti RRD sizes

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