removing / replacing in-use components in gvirstor

[Ivan Voras]

On 11/10/2007, Eric Anderson <anderson at freebsd.org> wrote:

> > In thinking about how I personally would use it, I realized I would add
> > drives to a system until I ran out of slots or controller connections, and
> > then want to upgrade to larger drives. From the manpage (and the code) it
> > doesn't look like this is currently possible unless the drive you want to
> > replace happens to be unused. How feasible would it be to either extend
> > the "remove" verb to migrate in-use chunks to other (existing) providers or
> > create a "replace" verb to migrate in-use chunks to a new provider?
>
> I wonder if making each drive a member of a single-device mirror, and
> then including all the mirrors into the gvirstor GEOM would do the
> trick.  That way, you can simply add a new drive to the mirrorset you
> want to replace, let the mirror sync, and then pop the old drive out.  I
> think the only remaining step is to re-mirror the mirror, or extend the
> mirror or partition..

I plan to add offline drive-replacing verb to the userland utility but
yes, that would also work.