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rrdresize can help: it (just) adds or removes locations for rows.
In my case it was not good enough because zenoss uses a variety of resolutions (step sizes), and so if you add rows to all of them rrdtool - when graphing - will often pick a higher resolution RRA that just had rows added (and hence contain unknown values), even though you have the values, albeit at a lower resolution.
So you need a way to update all rows in the RRA's.
I found a perl tool that does just that. (I think, I didn't study all details). So, you install that in your /home/zenoss for instance and then you run the following script, which creates new rrd files with the new settings and uses the perl script to copy all data into it.
> newrrd-logfile file=$1 backupdir=/home/zenoss/rrds-backup newdir=/home/zenoss/rrds-new [ -d "$backupdir" ] || mkdir -p "$backupdir" || exit 2 [ -d "$newdir" ] || mkdir -p "$newdir" || exit 2 [ -f "$file" ] || exit 3 echo "Processing $file .." base="`basename "$file"`" [ ! -f "$backupdir/$base" ] || mv "$backupdir/$base" "$backupdir/$base".old || exit 4 cp "$file" "$backupdir/$base" cd "$newdir" && rrdtool create "$base" \ --step '300' \ --start '1230768000' \ 'DS:ds0:GAUGE:900:U:U' \ 'RRA:AVERAGE:0.5:1:122640' \ 'RRA:AVERAGE:0.5:6:55536' \ 'RRA:MAX:0.5:6:55536' /home/zenoss/rrdremove.pl "$backupdir/$base" "$base" | grep -v 2009 # hide some output cp "$base" "$file" || exit 5 echo "Done" ]]>
Oh and btw, rrdwizard is a cool webapp when you're feeling too lazy/have forgotten how to write rrdtool commands
After modifying the script for my need, adding multiple ds(s), i did some comparison of the graphs of before and after.
i see the graph after is much more smoother than before and there are noticeable difference in average and max. I guess this is kind of expected ?
do you agree?
Posted by daniel on Thu Feb 25 18:10:00 2010
Well, the point was indeed to have higher resolution data, as Zenoss is very conservative (low-res after 50 hours) by default.
There shouldn't be big differences in average/max.
Although i have to add when i ran the script i noticed there were some graphs for which the data had become incorrect. But most of the graphs were fine.
Rely on your own judgement to see if it still looks correct afterwards. And make a backup. ;)
Posted by Dieter_be on Fri Feb 26 13:02:41 2010
Btw, I can integrate any useful patch to rrdmove you might send me :-)
Posted by Steve Schnepp on Fri Jun 11 07:30:25 2010
Posted by Michael on Wed Mar 30 14:25:36 2011
Posted by Michael on Fri May 13 09:55:54 2011