adding drive to raidz1

[Kip Macy]

> Both these are unfortunate restrictions.  I can understand that
> expanding a RAIDZ would be a fairly complex operation but it's
> probably the most requested feature.  I'm surprised that Sun don't
> allow removing vdevs from a pool - it's orthogonal to adding a vdev to
> a pool and (eg) HP AdvFS allows both.


http://blogs.sun.com/ahl/entry/expand_o_matic_raid_z

This has a very good discussion of how it could be done along with why
it hasn't been done.

Cheers,
Kip