beautiful! Thank you. (example i pasted back is 3 ds's - working.)
/apps/epic/rrdtool-1.2.99907080300/bin/rrdtool graph
/apps/epic/apache-2.0.61/htdocs/test/test.png -aPNG -se-3d -e1207628520 -l0
DEF:defwww100=/data01/epic/rrd/net/snmp/www100/.1.3.6.1.2.1.25.1.6.0.rrd:epoch:AVERAGE
DEF:defwww101=/data01/epic/rrd/net/snmp/www101/.1.3.6.1.2.1.25.1.6.0.rrd:epoch:AVERAGE
DEF:defwww102=/data01/epic/rrd/net/snmp/www102/.1.3.6.1.2.1.25.1.6.0.rrd:epoch:AVERAGE
CDEF:ds_u0=TIME,1207369320,LT,defwww100,TIME,1207455720,LT,defwww101,defwww102,IF,IF
VDEF:vdsmax0=ds_u0,MAXIMUM "LINE1:ds_u0#ff0000:blah" "GPRINT:vdsmax0:Max
%10.3lf %S"
Simon Hobson <[EMAIL PROTECTED]> wrote: Ryan Kubica wrote:
>What I am trying to do is take two or more datasources with
>different time ranges and merge them into one CDEF for display
>(graph and legend.)
>
>Example:
>
> ds foo1 - start 7 days ago, end 6 days ago
> ds foo2 - start 6 days ago, end 5 days ago
> ds foo3 - start 5 days ago, end now
>
> cdef is foo1 or foo2 or foo3
>
>I have the correct time alignments for the adjacent time intervals,
>ie: foo1 ends 60 seconds before foo2 starts on a 60 second interval
>step.
OK, for two data sources I have this in a graph definition :
DEF:data1=${RRDPath1}/${RRDName1}:${Selection}:AVERAGE
DEF:data2=${RRDPath2}/${RRDName2}:${Selection}:AVERAGE
CDEF:data=TIME,${ChangeDate},LT,data1,data2,IF
It's part of a shell script, so using normal Bash variable sustitutions.
For three sources just expand as required, I think this would do it
(with the proviso that changedate2>changedate1) :
CDEF:data=TIME,${ChangeDate1},LT,data1,TIME,${ChangeDate2},LT,data2,data3,IF,IF
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