On Tue, Jul 18, 2006 at 01:27:21AM -0700, Jeff Bonwick wrote:
> > Of course the re-writing must be 100% safe, but that can be done with COW
> > quite easily.
> 
> the ability to remap blocks would be *so* useful -- it would
> enable compression of preexisting data, removing devices from
> a pool, automatically moving cold data to slower devices, etc.

Being able to remove devices from a pool would be a good thing.  I can't
personally think of any reason that I would ever do it, but a friend of
mine keeps asking me why it can't do it and that it should be able to.

-brian
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