Re: [RFC] kernel facilities for cache prefetching

[Arjan van de Ven]

> Ascending block numbers on disk can be read very fast, as the disk needs no or 
> less seeking. That's even true for stripes and mirrors. (I grant you that 
> there are complicated setups out there, but these could be handled similar.)
> 


btw this all really spells out that you may want to do this as a device
mapper thing; eg have a device mapper module that can do "lookaside" to
a different order/mirror block whatever. The filesystem just doesn't
want to know; do it at the DM level ;) That also solves the entire
caching layering problem etc ;)

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