From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tregaron Bayly <tbayly@bluehost.com>
Subject: Re: replacing drives
Date: Fri, 26 Apr 2013 09:36:40 -0600
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To: Roberto Nunnari <roberto.nunnari@supsi.ch>
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> Any hint/advice welcome.
> Thank you. :-)

There's a section on extending an existing array on the raid wiki that I
believe covers what you're trying to do.  I've never had any problems
using the approach that's documented there.

https://raid.wiki.kernel.org/index.php/Growing

Regards,

Tregaron