[rrd-users] Re: bogus spikes with Infiniband traffic

[Andy Riebs]

Thanks Alex,

I'll give it a try

/andy

On Monday 23 October 2006 18:37, Alex van den Bogaerdt wrote:
> On Mon, Oct 23, 2006 at 11:51:04PM +0200, Alex van den Bogaerdt wrote:
> > Then either:
> > -1- As soon as possible, read the counters and feed this known data
> >     to rrdtool.
> > -2- make sure to know the exact reset time, and perform an update:
> >     "rrdtool update yourfile.rrd <timstamp>:0
> >     (assuming the counters start at zero; they probably will!)
> >
> > Either way you will loose some data.  The interval between the last
> > update before your reset, upto the interval following the first one
> > after the reset, will be lost.
>
> Correction: the interval between the last update before the reset,
> and the first update thereafter, will be lost.
>
> So:
>
> 1: update
> 2: reset
> 3: update
> 4: update
>
> Between (1) and (2) is lost,
> between (2) and (3) is lost,
> between (3) and (4) is known again.

-- 
Andy Riebs
     HP -- Better Together
High Performance Computing -- XC Linux Software
<http://www.hp.com/go/clusters>
(w) +1.603.884.1521
    andy.riebs at hp.com
(h) andy at candooz.com

My opinions are not necessarily those of HP

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