On Thu, May 04, 2006 at 09:33:24AM +0200, Arjan van de Ven wrote:
>
>
> > 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 ;)
I guess some big corps might want to install such a layer into their
storage products ;)
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