[dm-devel] dm-snapshot scalability - chained delta snapshots approach

[Bill Rugolsky Jr.]

On Wed, Sep 27, 2006 at 11:40:35AM +0100, rgammans at computer-surgery.co.uk wrote:
> I was considering some sort of B or B+ -tree type arrangement as then
> we can use the buffer-cache (I'm assuming something similiar still
> exists after the bh -> bio rewrite but I 'm a lttle behind) to store
> the commonly referenced exceptions, which should keep the memory
> required by the tables down at times of high memory pressure.
> 
> > There are still ongoing discussions about the snapshot target. It would be
> > nice if you have additional thoughts about this proposal. I guess it is
> > similar to one of your prototypes.
> 
> Is this where those discussion are taking place if I want to help 
> and particpate?
 
Daniel Phillips's csnap target was based on BTree design:

  http://sources.redhat.com/cluster/csnap/

There are papers there describing the design in great detail.

Unfortunately, his various projects (csnap, ddraid, ...) seem to have
been abandoned.

Regards,

    Bill Rugolsky