[rrd-users] Re: icmp measurements with rrd?

[BAARDA, Don]

G'day yet again,

> -----Original Message-----
> From:	BAARDA, Don [SMTP:don.baarda at baesystems.com]
> Sent:	Thursday, November 02, 2000 11:36 AM
> To:	'm.vernimmen at chello.nl'; BAARDA, Don
> Cc:	rrd-users at list.ee.ethz.ch
> Subject:	[rrd-users] Re: icmp measurements with rrd?
> 
> 
> G'day again,
> 
> > -----Original Message-----
> > From:	m.vernimmen at chello.nl [SMTP:m.vernimmen at chello.nl]
> > Sent:	Thursday, November 02, 2000 1:28 AM
> > To:	BAARDA, Don
> > Cc:	rrd-users at list.ee.ethz.ch
> > Subject:	Re: RE: [rrd-users] icmp measurements with rrd?
> > 
> > > Resampling is not a scary thing that needs to be worked around. All it
> > does
> > > is adjust input samples to fixed interval times. If you know the
> sample
> > > values at the exact times, entering them at those times will avoid
> > > resampling. If you don't know the true sample values at the exact
> times,
> > > then you probably really want resampling, despite any uneasiness you
> > feel
> > > about it :-)
> > 
> > I know that, but like I stated it's impossible to enter the values at
> the
> > moment they ocurred, because they are known only at a variable time
> after
> > the moment the value ocurred.
> > But I'll take this as a "no it's not possible".
> 
	I just re-read this, and I'm not sure I answered your question last
time. I think I confused you with 'entering at those [exact] times'. I
didn't mean feeding the sample to rrd at the moment the sample occurred, I
was referring to feeding the data to rrd with a timestamp exactly aligned
with an rrd "step", known as a "Primary Data Point" (PDP). This is a
(normally dodgy) way to avoid 'resampling', which is what rrd does to align
arbitrary timed samples to fixed interval PDPs.

	When entering data into rrd, you can specify the time of the sample
(it doesn't have to be 'now'). The moment you feed the data to rrd and the
timestamp on the sample are different things. 

	Don

--
Unsubscribe mailto:rrd-users-request at list.ee.ethz.ch?subject=unsubscribe
Help        mailto:rrd-users-request at list.ee.ethz.ch?subject=help
Archive     http://www.ee.ethz.ch/~slist/rrd-users
WebAdmin    http://www.ee.ethz.ch/~slist/lsg2.cgi