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

[Mark Plaksin]

Jason Fesler <jfesler at gigo.com> writes:

>> Do you have a feel for why having more DSes per RRD file gives better
>> performance?
>
> To be clear:  Why, for a given number of DS's, it is cheaper to lump them 
> together, instead of a DS per file...  that would be due to the number of 
> seeks per update involved, where I/O is mostly defined by how many RRA's 
> you use in the rrd - not the number of DS's.

Does this boil down to meaning that the parts of a single RRD file are
physically close to each other on disk?  And that multiple RRD files are
further apart?  I can see how that would make things a bit faster or slower
but it doesn't seem like it would make the huge difference that some people
seem to see when they put multiple RRAs into one RRD.

Am I just clueless? :)  Or does it make sense to you that the difference is
huge?

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