> Assuming that the datafiles are mail1.rrd, mail2.rrd and mail3.rrd
> is it permissable to graph data from different RRD sources? It's not
> implied that you can, so Im guessing. ie
> 
> /usr/local/bin/rrdtool  graph   $DIR/messages-day.gif           \
>         -v "No. of Messages"                                    \
>         -i                                                      \
>         -w 800                                                  \
>         -h 300                                                  \
>         -t "Rolling 24hr graph of Aggregate Mail totals Date: `date \"+%a %D [ %T ]\"`"       \
>         --start -86400                                          \
>         DEF:msgs_from_1=$DIR/mail1.rrd:msgs_from:AVERAGE        \
>         DEF:msgs_to_1=$DIR/mail1.rrd:msgs_to:AVERAGE            \
>         DEF:msgs_from_2=$DIR/mail2.rrd:msgs_from:AVERAGE        \
>         DEF:msgs_to_2=$DIR/mail2.rrd:msgs_to:AVERAGE        	\
>         COMMENT:"Colour Key:"                                   \
>         AREA:msgs_total#00ff00:msgs_total                       \
> 	CDEF:Total_out=msgs_from_1+msgs_from_2			\
> 	CDEF:Total_in=msgs_to_1+msgs_to_2			\
>         LINE1:msgs_from#ff0000:Total_out                        \
>         LINE1:msgs_to#ff00ff:Total_in                           
> 

Why not try it ?
My understanding is that it should be possible and if memory serves me
right, I've seen this somewhere in the docs or on the mail list.

> Incidentally, is there a way of getting two or three lines depth in the
> legend rather than one? I couldn't make out how that could be done
> 
After LINE1, put a GPRINT and make sure it ends in "\n"


Regards,
Alex

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