From mboxrd@z Thu Jan  1 00:00:00 1970
From: Can Jeuleers <can.jeuleers@gmail.com>
Subject: Re: Migrating a RAID 5 from 4x2TB to 3x6TB ?
Date: Tue, 09 Jun 2015 07:23:44 +0200
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To: Pierre Wieser <pwieser@trychlos.org>, linux-raid@vger.kernel.org
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On 08/06/15 21:28, Pierre Wieser wrote:
> Hi all,
> 
> I currently have an almost full RAID 5 built with 4 x 2 TB disks.
> I wonder if it would be possible to migrate it to a bigger RAID 5
> with 3 x 6TB new disks.

I'd recommend against it:

https://en.wikipedia.org/wiki/RAID#Unrecoverable_read_errors_during_rebuild

Jan