[dm-devel] Re: Was: [patch 1/1] md/dm: Reduce stack usage with stacked block devices

[Alasdair G Kergon]

On Wed, Jan 11, 2006 at 03:41:11PM -0500, Ming Zhang wrote:
> does this mean/confirm linux 2.6.x will not have a stable snapshot
> support any time soon?
 
Stable, yes.
Efficient, unlikely with the current implemention - hence the need
for a rewrite.

If you have 5 snapshots of the same origin, the current implemention
takes 5 copies of the data when you change it. That approach is
never going to scale well!  And it uses lots of memory.

Next patch is heading for dm-devel in the next hour or so...

Alasdair
-- 
agk at redhat.com