[rrd-users] rrdtool 1.3 and 'expiry' type graphs

[Phil Stoneman]

On Tue, Nov 10, 2009 at 09:27, Phil Stoneman <rrd at galaxy.org.uk> wrote:
> Hi guys
>
> We're using rrdtool to generate expiry graphs, using something like this:
>
> rrdtool graph - ";
>       --imgformat=PNG ";
>       --start=$graphstart";
>       --end=$graphend ";
>       --title=\"$caption\" ";
>       --base=1000 ";
>       --height=120 ";
>       --width=500 ";
>       -l 0 ";
>       --alt-autoscale-max ";
>       -r ";
>       --vertical-label=\"\" ";
>       --slope-mode ";
> DEF:a=\"/var/www/cacti/rra/upsa1_snmp_oid_1682.rrd\":snmp_oid:MAX:end=+315360000
> ";
>
> AREA:a#4444FFFF:\"Power\:\" ";
> VDEF:slope=a,LSLSLOPE ";
> VDEF:int=a,LSLINT ";
> CDEF: trend=a,POP,slope,COUNT,*,int,+ ";
> COMMENT:\"Current limit 100\" ";
> LINE:trend#FF00000:\"Predicted overflow\\:\" ";
> CDEF:overlimit=trend,100,INF,LIMIT ";
> VDEF:firstoverlimit=overlimit,FIRST ";
> GPRINT:firstoverlimit\" %d %b %Y\\\n\":strftime ";
>
>
> (Ignore the syntactic stuff at the ends of the lines, that's just our
> generation script)
>
> As you can see, I force the DEF to read a bunch of future data from
> the rrd, in order that my data sets have data into the future. This
> lets me get an expiry date even if it's beyond the right-hand side of
> the graph. Otherwise, rrdtool will only read data as far as the --end
> parameter, and the expiry value won't show properly.
>
> The question is - this ability seems to be broken in rrdtool 1.3; my
> expiry dates show as the epoch. I guess that rrdtool might be
> truncating the data sets if they extend beyond the graph period...
>
> This all works fine in rrdtool 1.2.
>
> Can anyone shed any light on this, and let me know if I'm doing something wrong?

Hi folks

Did anyone get any ideas on the above?

Thanks

Phil