[rrd-users] Questions about manipulating the data

[Philip Lawatsch]

Hi,

I'm trying to get some things working but need some help:


I've got a data source created by

$rrdtool create /opt/rrd/disk0.rrd -s 60         \
             DS:used:GAUGE:600:U:U   \
             DS:free:GAUGE:600:U:U  \
             RRA:AVERAGE:0.5:1:3000      \
             RRA:AVERAGE:0.5:30:700      \
             RRA:AVERAGE:0.5:120:775     \
             RRA:AVERAGE:0.5:1440:797    \
             RRA:MAX:0.5:1:3000          \
             RRA:MAX:0.5:30:700          \
             RRA:MAX:0.5:120:775         \
             RRA:MAX:0.5:1440:797        \
             RRA:MIN:0.5:1:3000          \
             RRA:MIN:0.5:30:700          \
             RRA:MIN:0.5:120:775         \
             RRA:MIN:0.5:1440:797

Now I want to plot this using an AREA (used) and then STACK the free on 
top of this.

Thats working fine, but now i've got some problems.

Sometimes I wont get data for more than one hour and of course have a 
hole in the Graph.

Since this does not look too good I'd like to use the last known value. 
How can I do this?

And, another problem:

I've got 5 such data sources and some of them where started after the 
first ones.

Thus I do a
	    CDEF:rused_disk0=used_disk0,UN,0,used_disk0,IF

To make these values appear as 0 in case there was no data.

The problem is, i want these values to be 0 only if the time for the 
value still lies inside the time of the other sources.

Otherwise my yearly graph's average value will be wrong.

Any ideas?

kind regards Philip

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