[rrd-users] Custom CDEF for Sum is Missing

[Yurek, Matt]

I'm trying to generate a graph of hits per day across an entire server
cluster.  Three servers handle the traffic to this one site, and the
hits per day per server are located in 3 RRDs.

When I generate the graph with the following command, if one server is
missing data (i.e. it was down for a day for maintainance, etc), the
entire day is left blank, even though 2 out of 3 RRDs have valid data.

I've tried a bunch of things like putting IF's in the CDEF line, and
have tried googling for it, to no avail.

Any assistance would be appreciated.

--
   rrdtool graph images/hitsPerMonth.gif 
	--start -31556926
	--height=200
	--lower-limit=0
	DEF:r1=rrds/server1-siteHits.rrd:data:LAST
	DEF:r2=rrds/server2-siteHits.rrd:data:LAST
	DEF:r3=rrds/server3-siteHits.rrd:data:LAST
	CDEF:custom=r3,r2,r1,+,+ AREA:custom#339999
	GPRINT:custom:AVERAGE:"Average\: %2.2lf"
	GPRINT:custom:MIN:"Minimum\: %2.2lf"
	GPRINT:custom:MAX:"Maximum\: %2.2lf \j"
--

Thanks,
Matt


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