zfs discuss - May 2008 - News on Single Drive RaidZ Expansion?

I cannot recall if it was this (-discuss) or (-code) but a post a few 
months ago caught my attention.
In it someone detailed having worked out the math and algorithms for a 
flexible expansion scheme for ZFS. Clearly this is very exciting to me, 
and most people who use ZFS on purpose.
I am wondering if there is currently any work in progress to implement 
that - or any other method of accomplishing that task. It seems to be 
one of the most asked about features. I haven''t heard anything in a 
while - so I figured I''d ask.

Cheers!

:EchoBinary

On Thu, May 8, 2008 at 8:59 PM, EchoB <echobinary at gmail.com>
wrote:
> I cannot recall if it was this (-discuss) or (-code) but a post a few
>  months ago caught my attention.
>  In it someone detailed having worked out the math and algorithms for a
>  flexible expansion scheme for ZFS. Clearly this is very exciting to me,
>  and most people who use ZFS on purpose.
>  I am wondering if there is currently any work in progress to implement
>  that - or any other method of accomplishing that task. It seems to be
>  one of the most asked about features. I haven''t heard anything in
a
>  while - so I figured I''d ask.
I suspect this might be what you''re looking for:
http://blogs.sun.com/ahl/entry/expand_o_matic_raid_z

However it''s dependent on the block pointer rewrite functionality
(which I believe is being worked on, but I cannot say for sure).