Re: expand raid10

[NeilBrown <neilb@suse.de>]

On Wed, 13 Apr 2011 14:34:14 +0200 Keld Jørn Simonsen <keld@keldix.com> wrote:

> On Wed, Apr 13, 2011 at 09:17:15PM +1000, NeilBrown wrote:
> > On Wed, 13 Apr 2011 13:10:16 +0200 Keld Jørn Simonsen <keld@keldix.com> wrote:
> > 
> > > On Wed, Apr 13, 2011 at 07:47:26AM -0300, Roberto Spadim wrote:
> > > > raid10 with other layout i could expand?
> > > 
> > > My understanding is that you currently cannot expand raid10.
> > > but there are things in the works. Expansion of raid10,far
> > > was not on the list from neil, raid10,near was. But it should be fairly
> > > easy to expand raid10,far. You can just treat one of the copies as your
> > > refence data, and copy that data to the other raid0-like parts of the
> > > array.  I wonder if Neil thinks he could leave that as an exersize for
> > > me to implement... I would like  to be able to combine it with a
> > > reformat to a more robust layout of raid10,far that in some cases can survive more
> > > than one disk failure.
> > > 
> > 
> > I'm very happy for anyone to offer to implement anything.
> > 
> > I will of course require the code to be of reasonable quality before I accept
> > it, but I'm also happy to give helpful review comments and guidance.
> > 
> > So don't wait for permission, if you want to try implementing something, just
> > do it.
> > 
> > Equally if there is something that I particularly want done I won't wait for
> > ever for someone else who says they are working on it.  But RAID10 reshape is
> > a long way from the top of my list.
> 
> Hi Neil!
> 
> Yes, that is how I understand your policy on contributions.
> 
> Do you by RAID10 reshaping also mean RAID10 expansion?
> In my eyes this is quite important, and something that I have wanted for
> a long time. I think it is a quite common task for many Linux MD users.
> 
> best regards
> keld


Yes, by 'reshaping' I mean everything included here:

http://neil.brown.name/blog/20110216044002#11

which includes size changes.

NeilBrown
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