excellent. now I have just started looking at rrd over the last couple of
days, maybe thinking of replacing my mrtg setup with it. there a couple of
questions for now:

first, a simple one, if I have many different objects/processess being
monitored, is it a good ides to segregate them into individual rrd files or
do you just chuck them all in together?

and now one in at the deep end: the tutorial at people.ee.ethz.ch/ gives the
following example:

rrdtool graph speed4.gif                           \
	--start 920804400 --end 920808000               \
	--vertical-label km/h                           \
	DEF:myspeed=test.rrd:speed:AVERAGE              \
	"CDEF:kmh=myspeed,3600,*"                       \
	CDEF:fast=kmh,100,GT,100,0,IF			\
	CDEF:over=kmh,100,GT,kmh,100,-,0,IF		\
	CDEF:good=kmh,100,GT,0,kmh,IF			\
	HRULE:100#0000FF:"Maximum alllowed"             \
	AREA:good#00FF00:"Good  speed"			\
	AREA:fast#550000:"Too fast"			\
	STACK:over#FF0000:"Over speed"			

the line I am interested in is the CDEF that calculates the 'over' variable.
I have an rrd which stores in and out traffic for eth0 on my development
machine and I graph (from a perl script) it like so:

system("rrdtool graph /var/www/html/rrdtool/eth0.gif \\
	--start -43200 --vertical-label bytes/second \\
	--title \"eth0 Traffic Monitor\" \\
	DEF:inoctets=/var/www/html/rrdtool/eth0.rrd:input:AVERAGE
	DEF:outoctets=/var/www/html/rrdtool/eth0.rrd:output:AVERAGE
	HRULE:20000#0F0000:\"Limit of Sensible Load\" \\
	LINE2:inoctets#00FF00:\"In traffic\" \\
	LINE2:outoctets#0000FF:\"Out traffic\"");

I want to be able to do something like the CDEF and STACK from the turorial
example where if the in or outgoing eth0 traffic is above a certain
ammount, then print it in a different color like the example. I have tried
adding the line and jst changing 'kmh' for 'inoctets', but it just makes the
graph go strange. Please can someone explain how that CDEF works so I can
customise it.

Thanks guys

On Sat, Oct 26, 2002 at 10:47:57 -0400, Derek Belrose wrote:
> Mat Harris wrote:
> 
> >have i got the right address to post to the rrd-users mailing list? i hope
> >so because i have loads of questions for you gurus.
> >
> > 
> >
> yep, most responses will be sent back to your private email as opposed 
> to the list (such as this one has)
> 
> But you have the right email.

-- 
Mat Harris			OpenGPG Public Key ID: C37D57D9
mat.harris@genestate.com	matthewh.genestate.com	

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