[rrd-users] Re: DS Choice

[paul at oninit.com]

Alex van den Bogaerdt wrote:
> 
> On Thu, Oct 23, 2003 at 09:52:47AM +0100, paul at oninit.com wrote:
> > I have a data source that steadily increases and I've been using
> > a DS of COUNTER and I get a nice spiky line - just what I'm after.
> 
> good.
> 
> > However, if for some reason the data counter is reset I loose
> > all the history data and start a 'new' spiky line.  The resetting
> > would typically only happen once/twice per year but the counter
> > will probably wrap the 2G every few months.
> 
> What program is deleting your history?  Surely this isn't rrdtool.

No definitely not.  Most of the data is disk/buffer activity.  If
left they will wrap at 2GB, but they can be reset manually back to zero.
By history data, I mean the rrdtool graphs don't show the old spikey
line.  I.e  Nice spiky line, reset the data at 12:00, spikey from 
before 12:00 is no longer displayed and a new line starting at
12:00 is displayed.

Hope that makes sense.  I'm trying to leave things running for longer
to make sure that I'm not causing the problem by unrealistically
resetting the data too often

> 
> > Am I using the correct DS?
> 
> >From what I read here, it is.  The worst thing that can happen is
> that rrdtool detects a ___HUGE___ spike.  This is why setting min
> and max (during rrdtool create) is a good idea.


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