[rrd-users] Re: DEF: CDEF: absolute path!!

[Alex van den Bogaerdt]

Siva.Namburi at nokia.com wrote:
> 
> 	The DEF and CDEF doesn't seem to take the
> absolute path... for ex
> 
>  DEF:mydelay=filename.rrd works but
>  DEF:mydelay=C:\netmonitor\netid\filename.rrd 
> doesn't work. Is there a way to get around this problem on NT.

I'm not sure but my guess is that the back slash is used as an escape
character inside perl.  Try both "C:\\netmonitor\\netid\\filename.rrd"
and "C:/netmonitor/netid/filename.rrd" as they may both do okay.

> 
> RRA:AVERAGE:0.5:1:24
> Does 0.5 here means it is half a second or 30 minutes. 

Neither. In the manual you can read that this is the xff setting which
is describes as:
               xff The xfiles factor defines what part of a
               consolidation interval may be made up from
               *UNKNOWN* data while the consolidated value is
               still regarded as known.
This is also discussed in the rrdtool tutorial.
It means that if RRDtool should use 10 samples to create one entry in
an RRA, 5 of them can be unknown and you still get a valid entry in the
RRA.  If 6 of the samples were unknown, you get an unknown entry.

> Also,
> lets say you have created three RRA's like for the
> same DS "delay".
> 
> RRA:AVERAGE:0.5:1:600
> RRA:AVERAGE:0.5:6:700
> RRA:AVERAGE:0.5:24:700 
> How do you plot all the three at the same time
> hoping that they had gone thru one cycle of averages,
> since the "graph" command only knows about one average
> DEF:mydelay=$filename.rrd:delay:AVERAGE.
> 
You can't.  RRDtool will use the RRA with the best possible resolution
and depending on the interval graphed, this is fetched from one of those
RRAs.

regards,
-- 
   __________________________________________________________________
 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
| work                                                         private |
| My employer is capable of speaking therefore I speak only for myself |
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