[rrd-users] [unsure] max DS per rrd file

[mikel]

Thank you David, that is interesting input. cheers, m


2013/4/20 David Thornton [via RRD Mailinglists] <
ml-node+s937164n7580973h13 at n2.nabble.com>

> I try to group the collection in logical units: 15 sql vars per host -> 1
> file. 25 smtp variables per host -> 1 file. 1500 hosts? 3000 files. Each
> host writes two files. It spreads well.
>
> Later I move those files centrally and start "looking" at
> them. Separating collection from reporting is big. There is a trade off,
> making the collection nice and light , my reporting is has more latency in
> it, both in the time before I get data, and the complexity and time to
> compose the report. google "olap versus oltp".
>
> David Thornton
>
>
> On Sat, Apr 20, 2013 at 7:48 AM, mikel <[hidden email]<http://user/SendEmail.jtp?type=node&node=7580973&i=0>
> > wrote:
>
>>
>> Thanks for your fast reply again.
>>
>> >Maybe I don't understand what you say here. Some metrics, or all metrics
>> are
>> >queried? Both statements cannot be true at the same time?
>>
>> Yes it is a tricky case. Apologies I was not clear enough.
>>
>> In most cases all metrics are queried at the same time, because we want to
>> know what value they had at a given time. And classify them.
>>
>> Very randomly we would query for just one metric.
>>
>> >Anyway, if you query only once in a while, maybe you should think about
>> >reducing the number of RRAs in each RRD, and just let it consolidate at
>> >graph time. Yes, this will mean you will have to wait longer for your
>> graph
>> >to be made, but you save processing time at every update.
>>
>> This is interesting I did not think about that. Thanks for the hint.
>>
>> Thanks for your help again.
>> m
>>
>>
>>
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