[rrd-users] GAUGE stored values
linux at thehobsons.co.uk
Thu Aug 19 08:53:09 CEST 2010
Marc MERLIN wrote:
> > > See 'Can't I turn off data smoothing for GAUGE?' thread that I
>> > a few days earlier :)
>> > Marc
>> The doc says that there isn't any (see my second post).
>If it does say that, it is likely wrong then.
It is wrong, or more correctly, it is misleading in the wrong context.
> > Perhaps the answer is to add a new data type which is explicitly
>> recorded "as is" (maybe call it RAW).
>that, or DATA like I proposed (i.e. we pretty much said the same thing
The problem is that without **significantly** changing the data
model, it is not possible to store arbitrary data at arbitrary times
without normalisation. The data model simply does not deal with
timestamped data, all data is normalised into regularly sized 'bins'.
IFF you feed in data on each step boundary (not a second early, not a
second late, and don't miss any), then normalisation is a null
operator and what you feed in will be what's stored (after conversion
to a floating point). But you obviously can't do consolidation
without breaking that.
In particular, see the tutorial on "Rates, normalizing and consolidating"
for an explanation of what rrd tool does.
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