[rrd-users] Re: Who has the most RRD files (or data sources)?
happy at usg.edu
Sun Mar 19 03:42:53 MET 2006
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
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