Hi Alex, Thanks for your answer. I would like to add a zoom function into cacti (very good rrd frontend), I would like to use cactistoric and it has a readme file what says that raise the number of rows in the RRA. I guess it will create nicer graphs if it has more rows in the daily rra.
Well my fronted create graphs in this manner (focusing --start --end option): So, do I have to worry about my graphs? Daily (5 Minute Average) /usr/bin/rrdtool graph - \ --imgformat=PNG \ --start=-86400 \ --end=-300 \ Weekly (30 Minute Average) /usr/bin/rrdtool graph - \ --imgformat=PNG \ --start=-604800 \ --end=-1800 \ Monthly (2 Hour Average) /usr/bin/rrdtool graph - \ --imgformat=PNG \ --start=-2678400 \ --end=-7200 \ Yearly (1 Day Average) /usr/bin/rrdtool graph - \ --imgformat=PNG \ --start=-33053184 \ --end=-86400 \ Thanks, Andras >On Thu, Jul 08, 2004 at 12:00:20PM +0200, Andras Horvai wrote: >> Hi All, >> >> I plan to resize my rrd files. Plan to raise the daily RRA (5 minutes >> average) from 600 rows to 17280 rows to >> have 2 months of 5 minutes average data. I read somewhere (perhaps in cacti >> forum) that this can cause >> problems eg. I lost the data what 2 weeks earlier. I read a opinion that >> resize the rrds more than one step. >> My question is what steps do you recommend? eg. first raise from 600 rows to >> 800 rows and wait 1 day (or less) >> and after raise from 800 rows to 1000 rows etc. Can you advise? > >This depends on what you want and what you need. The "problem" is >in auto-selecting the correct RRA. > >If you ask for "--start end-5d --end now", RRDtool currently has no >other choice than to use the 2-hour RRA. > >Next you are adding more rows to the 5-minute RRA. > >RRDtool may use the 5-minute RRA where it used to use the 2-hour RRA. >Since this data is not yet known (you will be adding "NaN" rows) the >data _seems_ lost. > >If your front end is careful and sets both "--start" and "--end" to >suitable values, RRDtool will select the 2-hour RRA (or even the >1-day RRA) in stead of the 5-minute RRA and no harm is done. -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://www.ee.ethz.ch/~slist/rrd-users WebAdmin http://www.ee.ethz.ch/~slist/lsg2.cgi
