how can I access data stored by pnp4nagios

[Rahul Nabar]

I just updated my nagios installation so that I can get cpu-core
temperatures with lm_sensors. Works fine. I have pnp4nagios which give good
time series trends of temperatures as well.

But the problem is if I want a snapshot of CPU temperatures right now for my
whole server room hardware (or at any other past instance of time)
pnp4nagios is not useful. It gives a time series but not a spatial (trend
over servers at a point in time) graph. If I wanted to hack together my own
graphing tool what's the best place to pull out data from?

Digging in I noticed the /nagios/share/perfdata/serverxxx/ directory which
does have the xml and rrd files. Is this a good spot to pull data out from
for each monitored server?

Unfortunately that would only be for the latest time instance , right? But
since pnp4nagios can plot over a time range it must have access to historic
temperatures too. So, where are these stored? I suspect internally  as a
binary produced my rrdtool?

In which case is there another way for me to access historic_perf_quantity
at a given point in time for all servers? Or perhaps it is possible to
generate something like this using custom rrdtool queries?

Any sugesstions?

-- 
Rahul
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