[rrd-users] Re: rrdupdate with UNKNOWN and 0 value

[ralf-buero at kruedewagen.de]

Hello,

is there really nobody who can explain this behaviour:

After creating a new database, the first update with "rrdtool update 
<file> N:U:0" stores NaN values for both DS. Then, the second update 
stores two 0 values for both DS ! But I would expect to store (and 
keep) NaN for DS1 and 0 only for DS2. This seems to be a bug, at 
least for me.

Thanks in advance
Ralf

> Hi,
>
> I have a strange problem when updating (v1.2.10) my rrd database
> with an UNKNOWN value combined with a 0 value.
>
> Situation: My database has two DS, both from type GAUGE, step 900
> (15 min.) , heartbeat 3600 (60 min).
>
> Problem: When I update the database with "rrdupdate <file> N:U:0",
> the database is storing 0 values for both DS. But I would like to
> store an UNKNOWN value for DS1 and a 0 value for DS2.
>
> I am quite sure that this problem does not occur with
> rrd_version=0001 databases. My "problem-database" has been created
> with a later rrd version "rrd_version=0003".
>
> Any idea ? How to avoid storing a 0 value when UNKNOWN is wanted ?
>
> Cheers
> Ralf
>
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