[HOWTO] RESIZE existing RRAs of existing RRDs

maxclark · Joined: 09 Feb 2006 Posts: 12

Thanks for posting this.

fmangeant · Posted: Thu Nov 23, 2006 9:26 am Post subject:

Thanks Reinhard !

I used to modify RRAs juste after installing Cacti, but I forgot to do so on my secondary server. A few minutes after running the script, RRD files were at the desired size

BTW, this thread should be made sticky...

mokeybrains · Joined: 22 Aug 2005 Posts: 38 Location: San Francisco, CA

I resized a bunch or RRAs. my test one (which I did first and verified) I accidentally resized twice and 'grew' it twice. Is there an easy way to shrink the RRA? Feature request for next resize.pl version!

Also, RE: wanting to see fine granularity a year ago: that's absurd, no one should be looking that far back.

Move on to the future!

gandalf · Posted: Tue Mar 06, 2007 2:58 pm Post subject: Re: resize ... with shrink?

mokeybrains · Joined: 22 Aug 2005 Posts: 38 Location: San Francisco, CA

Ha! You would think that Cactitians would care about system performance... but then again, load and cpu graphs near 0 are boring.

Attached is a little patch to allow you to us resize to grow or unGrow your RRD files.

The '-G' flag will shrink, while the -g flag will still grow. You can, in a fit of confusion, use them both and the difference of the two will be applied to your RRD file.

Ahuber · Joined: 16 Nov 2006 Posts: 44 Location: BC, kootenays

I just wanted to mention, ... My rrd's are 32mb, some are 80mbs (depending on how many DS). And they only hold 1 minute resolution for the entire year (365 days)
After reading this post, that's not right, is it?

mokeybrains · Joined: 22 Aug 2005 Posts: 38 Location: San Francisco, CA

I find it hard to believe that anyone would really want to look at any data on a minute granularity from half a year ago. No, I am not trying to bait any one, but really, I monitor 51 devices, and the last thing I need is granularity from a long time ago: it just doesn't help in debugging machines or billing customers...

Ahuber · Joined: 16 Nov 2006 Posts: 44 Location: BC, kootenays

Unfortunatley I agree with you monkey brains. But I'm trying to work out that mistake, by saving my graphs, becuase if it's more than 2 months old data, I only want to see what it averaged over 2 or 4 hours. We do need some granularity to detect trends over the course of 8 to 12 or more months, but not at a minute. I am reading many posts to consolidate, it's kinda hard right now, but I am determined. I don't know how large an rra should be at a per minute over 12 months, does anyone know?