[rrd-developers] rrd file access code

[Daniel.Pocock at barclayscapital.com]

> 
> having things configurable at runtime is certainly a 'good thing'
> in todays world where skills in compiling stuff are rapidely 
> dwindling ...
>

It's also good for troubleshooting - e.g. if someone has a problem, they
can quickly switch from mmap to regular file access to see if the
problem goes away
 
> As abstractions go ... having the ability to transparently 
> support different storage layouts is also something that will 
> be required for the new rrd format if there is to be backward 
> compatibility.
> 

I don't mind proposing patches for some of these generalisations,
although I thought it best to describe the concept first and make sure
it is consistent with the project's direction.

Regards,

Daniel
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