[HOWTO] RESIZE existing RRAs of existing RRDs

gandalf · Posted: Wed Apr 19, 2006 5:00 am Post subject:

Why do you suppose this to be odd? If you've only the yearly rra left and defined this with loads of data points, this is the expected result.
Please try again to give me an idea of what you're trying to get. As I'm german, this may need some extra effort ...

Reinhard

warenet · Posted: Wed Apr 19, 2006 10:24 am Post subject:

I guess I find this odd:

rra[0].pdp_per_row = 115200

But maybe I'm wrong??

My goal would be to have Cacti create the "proper" RRAs for these files automatically. Barring that I'd prefer to not have to switch to the "old" non ZLVM RRAs in the data template each time I want to add a new graph, and then to have to resize, and then switch the RRAs back to the ZLVM ones in the data template.

Is this possible?

gandalf · Posted: Wed Apr 19, 2006 2:03 pm Post subject:

My question was the other way round. What settings are you aiming at
- which rra settings do you need? How many data points at 5min interval, how many at 30 min, at 2h and at 1 day (or at other settings, if you like)
- which detail display do you want? That is, when selecting the "normal" graph, do you want to see 4 graphs (as usual), or 5, or 3? And what timespan should they incorporate?
Reinhard

warenet · Posted: Sat Apr 22, 2006 11:16 am Post subject:

Reinhard,

Thanks as always for the assistance.

What I'm aiming for is a year worth of 5 minute resolution data.

As for graphs, I'm not too picky. I guess day, week, month, and year would be good.

I have three different data source types: a "standard" traffic-in/traffic-out from a Cisco Router, one from nfsen (netflow collector data, with essentially only "traffic" that's selected by a tcp filter), and a custom script that collects outbound data from streaming servers.

I'd like all of these to have the same resolution and same number of graphs.

Does this help?

gandalf · Posted: Sun Apr 23, 2006 2:18 pm Post subject:

Ok, I understand. As my first quick shots missed, I'll have to look at this in more detail. This will take some time. But first, I will check, what cacti 0.9 will give us here. So please allow for some days 'til next response
Reinhard

PS.: I suppose, we should create a new topic out of this, as it may be of interest for others as well

warenet · Posted: Sun Apr 23, 2006 4:04 pm Post subject:

will do...

thanks a ton!

geggart · Joined: 13 Jun 2006 Posts: 2

Hi,

I can't seem to find the RRDp module, from what I understand this should be compiled when the rrdtool binary is created?
However when I list the details of my rrdtool package (RPM on AIX)
then i get the following:

/opt/freeware/lib/perl/5.8.0/aix-thread-multi/RRDs.pm
/opt/freeware/lib/perl/5.8.0/aix-thread-multi/auto/RRDp/.packlist
/opt/freeware/lib/perl/5.8.0/aix-thread-multi/auto/RRDs/.packlist
/opt/freeware/lib/perl/5.8.0/aix-thread-multi/auto/RRDs/RRDs.bs
/opt/freeware/lib/perl/5.8.0/aix-thread-multi/auto/RRDs/RRDs.so
/opt/freeware/lib/perl/5.8.0/aix-thread-multi/ntmake.pl

Can you tell me how I can obtain the RRDp module for this? or how it should be compiled into rrdtool.

Thanks

gandalf · Posted: Tue Jun 13, 2006 5:12 am Post subject:

Sory for not being able to give a satisfying answer. But you may post this question to the rrdtool-users mailing list.
My understanding matches yours. It should be there when compiling from source. AFAIK, there's a ./configure options for creating the perl modules
Reinhard

geggart · Joined: 13 Jun 2006 Posts: 2

Hi folks,

ignore my query above as we have now managed to have the RRDp module compiled into rrdtool for AIX.

Thanks

kelbyc · Joined: 28 Nov 2005 Posts: 44

please see following question

kelbyc · Joined: 28 Nov 2005 Posts: 44

I now have resize.pl working on a Windows XP install. I just commented out line 133 in the rrdp.pm module. HOWEVER, after resizing an RRD I cannot use the zoom function in Cacti to view my historical data. The data shows on the monthly and yearly graph but when I zoom in I get a blank graph. The only data that now shows in any graph for a given RRD is the 5-minute data (which is currently 2 days worth). Anything older than 2 days doesn't show up when using the Zoom-In feature in Cacti. What do I need to change to get that data to show in 30 minute and 2 hour averages like it did before resizing? I understand that once more 5 minute data is collected that it will show but I would like to see the 30 minute and 2 hour data until then.

gandalf · Posted: Fri Sep 01, 2006 3:15 pm Post subject: Re: Can't Zoom after resize

kelbyc · Joined: 28 Nov 2005 Posts: 44

Thanks for the reply. I think my biggest area of misunderstanding is which RRA to specify. This particular RRD has 0-7 RRAs. I assume I just need to resize 0 which is the AVERAGE RRA. Is this correct?

gandalf · Posted: Sat Sep 02, 2006 12:58 pm Post subject: Re:

kelbyc · Joined: 28 Nov 2005 Posts: 44

I figured out what I was doing wrong. When I resized I did it for 2 months of data. I was ony looking at historic data in that time frame. When I looked at some that was 4-5 months old it used the correct RRA, just like you said it would, and displayed the historical data. I just won't have "zoomable" data through those 2 months until new data fills that area. Thanks for the help.

By the way. If anyone is looking for an easy way to resize RRDs without using the command line then check out rrdeditor. It's extremely easy to use. Find it at http://www.thetoolsmith.com/