[rrd-users] using rrd-fetch on different rrd versions

[Tobias Oetiker]

Hi Kevin,



>
> Hi all .. I have a question I cant seem to figure out. Its probably
> related to versions of files and rrd itself?
>
> I have a cgi that processes a number of rrd files and gives a quick
> view of our network, similar to this [1].
>
> My cgi utilizes rrdtool fetch and last to get a lot of this info. My cgi
> works (and was build using rrdtool v1.0.45) the rrd files are all
> rrd_version 0001.
>
> I'm now trying to move this cgi to an updated system using rrdtool v1.4.1
> .. the rrd files were created in 0003 from the old .log files.
>
> The cgi did not transfer over as well as I'd hoped... here is what I
> get.
>
> old system (v1.0.45)
>
> #> rrdtool last p-gw/p-gw..domain.48.rrd
> 1270128605
> #> rrdtool fetch p-gw/p-gw..domain.48.rrd AVERAGE -s 1270128605 -e 1270128605
>                        ds0           ds1
>
> 1270128600: 1.0732106860e+07 2.0613049294e+06
> 1270128900: nan nan
>
>
> #>rrdtool fetch p-gw/p-gw..domain.48.rrd AVERAGE -e 1270128605 -s e-1h
>                        ds0           ds1
>
> 1270125000: 9.7269144271e+06 1.0919141715e+06
> 1270125300: 8.8460543158e+06 1.2361113724e+06
> 1270125600: 6.8147858863e+06 1.0363716217e+06
> 1270125900: 6.3934964925e+06 1.2206743095e+06
> 1270126200: 7.2838555685e+06 1.1741172224e+06
> 1270126500: 8.3824834738e+06 1.3510240963e+06
> 1270126800: 7.3780240816e+06 1.4877694660e+06
> 1270127100: 8.2552640772e+06 1.5213092213e+06
> 1270127400: 1.0140057357e+07 2.0537647957e+06
> 1270127700: 1.0411283593e+07 1.7643597675e+06
> 1270128000: 8.9832687010e+06 1.9343601365e+06
> 1270128300: 9.4893042253e+06 2.1962486770e+06
> 1270128600: 1.0732106860e+07 2.0613049294e+06
> 1270128900: 1.0200465016e+07 1.7934596805e+06
>
>
> new system (v1.4.1)
>
> #> rrdtool last
> /opt/netops/logs/p-gw/p-gw..domain.48.rrd
> 1270129817
> #> rrdtool fetch
> /opt/netops/logs/p-gw/p-gw..domain.48.rrd AVERAGE -s 1270129817 -e 1270129817
>                              ds0                 ds1
>
> 1270130100: nan nan
> #> rrdtool fetch /opt/netops/logs/p-gw/p-gw..domain.48.rrd AVERAGE -e 1270129817 -s e-1h
>                              ds0                 ds1
>
> 1270126500: 8.4262543537e+06 1.3438348268e+06
> 1270126800: 7.4725318401e+06 1.4941898914e+06
> 1270127100: 8.2927419247e+06 1.5459414521e+06
> 1270127400: 9.9426773601e+06 2.0037003950e+06
> 1270127700: 1.0518733187e+07 1.7919992178e+06
> 1270128000: 9.0407725630e+06 1.9691786607e+06
> 1270128300: 9.4605819838e+06 2.1231830550e+06
> 1270128600: 1.0684201693e+07 2.0754932151e+06
> 1270128900: 1.0095553905e+07 1.7893792049e+06
> 1270129200: 8.9499901631e+06 1.7249495181e+06
> 1270129500: 1.0585450694e+07 1.4641095182e+06
> 1270129800: 1.0634290170e+07 1.5452405575e+06
> 1270130100: nan nan
>
> Is there a new(er) way to make my fetch query work for the latest entry?
> I've tried lastupdate but that does not give the value my app is
> expecting.

well the problem is that 1.0.x was broken as it sent you more data
then what you asked for ... what you may want todo, is to ask for

now - 1 step instead of 'now' since it is very unlikely that there
is already data within the rrd file for 'now' hence the nan answer

cheers
tobi


>
>
> [1] http://www.people.iup.edu/kpfoote/files/netstats-clip.png
>
> ------
> thanks
>    kevin.foote
>
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>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900