On Wed, 2009-09-16 at 11:41 +0200, Goswin von Brederlow wrote:

Alternatively write a re-map device-mapper target that reserves some
space of the disk and remaps bad blocks itself.

That'd require some place to store the mapping so that the whole thing
still works after a reboot. Which should probably be on a different
disk. 

I tend to want to move (part of) that problem to userspace; you may want
to do more than a simple remapping of a few blocks when that happens
(e.g. test-reading the surrounding area).