Re: Is it possible to grow a (far) RAID 10?

[NeilBrown <neilb@suse.de>]

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On Tue, 25 Nov 2014 12:01:58 +0100 cvb@kruemel.org wrote:

> Hi
> 
> Am 2014-11-25 10:25, schrieb Carsten Aulbert:
> > Without much thinking, I would simply follow the wiki page, mark a
> > device as failed, remove it, repartition it, add it again, and wait
> > for sync to complete. Repeat for all 4 devices and finally --grow with
> > mdadm (followed by xfs resizing) - and of course, all online, while
> > machine is in flight.
> 
> That is exactoy what I did with my RAID 10 a bit more than a year ago. 
> It basically worked, but there was one caveat... some part (the 
> ---grow?) which required a certain kernel version for which I had booted 
> a live CD back then...
> 
> The thing is, I can't exactly remember what the caveat was. And as I'm 
> about to grow the RAID again (having replaced all hard drives already), 
> I have been looking for the related mails in the archive of this list, 
> but I can't seem to find them...
> 
> So I guess we'll have to hope that Neil replies again.

I recommend creating some loop-back block devices and experimenting.

But I'm fairly sure that "far" RAID10 arrays cannot be reshaped at all.

NeilBrown

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