[rrd-users] Re: strange beavior

[Tobias Oetiker]

Yesterday Un L'Unique wrote:

>
>
> Some data sundenly gone...
>
> While searching what happend to my "lost data" I discover something strange:
> 1) it is possible to fetch NaN data prior to creation base or --start time
> eg rrdtool fetch --start 19900101  pebble_Cpu.rrd AVERAGE
>
> 2) rrdtool dump generate xml file containing very old ( 1997) NaN data.
>
> Bug or misunderstanding ?

Well, mrtg contains a datastore of constant lenght. If you define
an RRA of 2 years length, and have a start time of "now" the
'newest' data in the RRA will be 'now' and the 'oldest' from two
years ago ... as rrdtool does not know the data from 2 years ago it
is set to 'unknown'

cheers
tobi
>
> Un
>
>
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