[rrd-users] Minimum resolution for fetching data

[Martijn Lievaart]

Duh!

My 1 second RRA wasn't large enough to cover the time period I looked 
at. I'll try in a minute, but that is definitely wrong.

And yes, I'm really getting (most of the) updates one per second. The 
program that generates the data by parsing libpcap output makes sure of 
that. I'm currently only testing with pre existing captures (hence it 
was so far in the past I did not have 1 second resolution data) but when 
it looks at life data there will be a queueing mechanism to ensure the 
data gets delivered.

Thanks again,
Martijn Lievaart

On 31-07-14 11:52, Steve Shipway wrote:
> Other possibilities are that you're not getting the smaller RRA because it doesnt completely cover your time window, or because it has the wrong CF, or you have a 1sec interval but only a 1 minute RRA.
>
> If you set a RRD with a 1second interval, you probably want a much higher heartbeat on the various DSs, plus a very small XFF on the RRA, unless you really are getting your updates one per second.
>
> Steve
>
> Steve Shipway
> University of Auckland ITS
> UNIX Systems Design Lead
> s.shipway at auckland.ac.nz
> Ph: +64 9 373 7599 ext 86487
>
>
> ________________________________________
> From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] on behalf of Martijn Lievaart [m at rtij.nl]
> Sent: Thursday, 31 July 2014 9:18 p.m.
> To: rrd-users at lists.oetiker.ch
> Subject: Re: [rrd-users] Minimum resolution for fetching data
>
> OK, thanks.
>
> I must be doing something wrong then. I'll triple check and post either
> the solution or a followup question.
>
> Martijn Lievaart
>
>
>
> On 31-07-14 11:07, Steve Shipway wrote:
>> The minimum resolution you can fetch is the minimum resolution of all the RRAs which completely cover the time window you are asking for.
>>
>> The minimum resolution of an RRA is 1 interval, and the minimum interval is 1 second.  Both of these are set at RRD creation time, and have an implication on data collection and update frequency.
>>
>> If you are only getting 1 minute resolution data, I suspect you have a 1minute Interval on your RRD with a count-1 RRA.
>>
>> Steve
>>
>> Steve Shipway
>> University of Auckland ITS
>> UNIX Systems Design Lead
>> s.shipway at auckland.ac.nz
>> Ph: +64 9 373 7599 ext 86487
>>
>>
>> ________________________________________
>> From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] on behalf of Martijn Lievaart [m at rtij.nl]
>> Sent: Thursday, 31 July 2014 8:59 p.m.
>> To: rrd-users at lists.oetiker.ch
>> Subject: [rrd-users] Minimum resolution for fetching data
>>
>> Hello list,
>>
>> I googled this but could not come up with anything definitive, so I
>> thought I'ld ask here.
>>
>> I work for a client that uses Citrix a lot. This means that it sometimes
>> is important to get graphs in one second resolution. I cannot seem to
>> get rrdtool to do so, the minimum resolution it will come up with is 1
>> minute.
>>
>> My question, is this my mistake somehow, or is this RRD design? If
>> needed I'll post details about how I create the RRDs and how I fill them.
>>
>> Regards,
>> Martijn Lievaart
>>
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