ZFS pool restructuring and emergency repair

[Quartz]

> Although in one of Matt Ahrens talks at BSDCan he spoke of plans to
> change this.  Essentially you'ld be able to offline a vdev, and a
> background process (like scrub) would copy all the data blocks from that
> device to elsewhere in the pool.  Once finished, the devices making up
> the vdev could be physically removed.

Oh, that would be nice. Was there a timeline guesstimate for when that 
would be implemented, or was it more a "maybe someday" thing?