From mboxrd@z Thu Jan  1 00:00:00 1970
From: pg@lxra2.for.sabi.co.UK (Peter Grandi)
Subject: Re: can't add a larger spare for a failed smaller disk
Date: Mon, 26 Jun 2017 00:30:38 +0100
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> All seems to went good, but data offset are not equal on sdc
> and sdg, should I grow ? or something else ? thanks again

That "works" if it works, but can be a very dangerous situation
as the space available for data is different on the various RAID
set members, as if the disks were of sligtly different sizes.

http://www.sabi.co.uk/Notes/linuxStor.html#stHintsMD