[rrd-users] Re: Who has the most RRD files (or data sources)?

[Mark Plaksin]

Jason Fesler <jfesler at gigo.com> writes:

> On Wed, 15 Mar 2006, Mark Plaksin wrote:
>
>> Who has the most RRD files (or total data sources in RRDs)?  How frequently
>> are they updated?  What do you use to update them?
>
> I can't say how many I'm doing aggregate..  but..  on a single box basis, 
> we're updating 2000 files with an average of 10 ds's per rrd file, fora 
> total of 20,000 values, once a minute, and we have reasonable query 
> performance for displaying data when we need it.
>
> On a server with 8 ide disks, raid 10, 3ware, CPU is usually not the 
> bottleneck (except for displays perhaps).  Aveage write wait is about 
> 3 ms (as instrumented by our collection scripts).  Linux report our 
> I/O utilization at 25-30%.
>
> We've pushed it much higher in the past, but that basically made all that 
> valuable data.. useless.  Especially when things are on fire and you need 
> access to that data NOW.
>
> Our observation  is that as we add rrd files, load goes up significantly. 
> Adding more DS's to existing files, much more negligable.  However, adding 
> DS's to files, is painful  at best.

Do you have a feel for why having more DSes per RRD file gives better
performance?

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