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

[Alex van den Bogaerdt]

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.

-- 
Alex van den Bogaerdt
http://www.vandenbogaerdt.nl/rrdtool/

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