[rrd-users] Re: hwpredict/devpredict problems

[Patrick Felt]

Tobi,
   well....  i feel a little stupid.  i guess my misunderstanding of the 
hw algorithm shows here, but in formulating my answer i found that 
devpredict was getting filled out properly.  i've upped a graph from the 
rrd so you can see what my problem was:

http://www.feltonline.com/p_c/example.png

it would appear that i didn't have enough data for hwpredict to kick in? 
  the last graph that i'd created was before it picked up at about 21:30 
last night.  it was then that i really started trying to research the 
problem and joined the list.

pat

Tobias Oetiker wrote:
> Today Patrick Felt wrote:
> 
>> i've been having problems with hwpredict.  the devpredict rra shows as
>> nan all the time.  in researching what i've done wrong i found this bug:
>>
>> http://people.ee.ethz.ch/~oetiker/webtools/rrdtool-trac/ticket/8
>>
>> a note at the bottom, added by tobi, says:
>> -------------snip----------------
>> The problem seems only to occur when running several updates in one
>> round ... when calling rrdtool updatev once for each number then all is
>> fine. This explains why this problem went undetected for so long I guess.
>> -------------snip----------------
>>
>> how does on "call rrdtool updatev once for each number" ?
> 
> Hi Pat,
> 
> instead of calling
> 
> rrdtool update a:x b:z
> 
> you call
> 
> rrdtool update a:x
> rrdtool update b:z
> 
> or does your problem not get solved by this ?
> 
> cheers
> tobi
>> pat
>>
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