-------- Original --------
Betreff: Re: [rrd-users] Input values normalization
Datum: Tue, 18 Feb 2014 19:55:38 +0100
Von: Reinhard Scheck <[email protected]>
An: Simon Hobson <[email protected]>
On 18.02.2014 18:03, Simon Hobson wrote:
>> There is nothing wrong with, for instance, setting steps==3600 and CF==MAX
>> to remember the highest temperature reported during an hour, and to have
>> this as the RRA with finest granularity.
>>
>> You could have two RRAs, one remembering MAX the other MIN, and then show
>> the temperature range seen suring any hour (e.g. a red area for the max
>> temperature seen, overlayed by a blue area for the minimum temperature
>> seen).
>>
>> Not sure if cacti can do this, that's for someone else to answer, but
>> RRDtool can do it.
>
> I'm fairly sure you can, but you'd need to do your own (non standard) data
> source setups. I suspect you might be better doing your own data collection
> as I'm not sure how well Cacti handles lots of high-frequency collection
> tasks - I have a fair number of RRDs where I collect the data externally but
> graph it in Cacti.
It depends on the polling interval. It is known, that people go down to 10 sec.
interval, 1min intervals are used frequently and 5 min being the default.
Using the "spine" poller, it is possible to collect data from many thousand data
sources (we do collect about 100,000 in about 70 sec; some scripts among them
lasting 40-45 sec alone)
Reinhard
> rrd-users mailing list
> [email protected]
> https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
>
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