From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wols Lists <antlists@youngman.org.uk>
Subject: Re: Using mdadm --grow to resize a RAID1
Date: Mon, 2 Jan 2017 18:52:05 +0000
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On 02/01/17 18:38, Ben Kamen wrote:
> On Mon, Jan 2, 2017 at 12:17 PM, Wols Lists <antlists@youngman.org.uk> wrote:
>> On 02/01/17 17:59, Ben Kamen wrote:
>>> Sounds like I have to do this from single user mode or an boot disk/CD?
>>
>> Important snippet of information we should have asked and I don't
>> remember seeing ... what kernel and mdadm are you using?
> 
> 
> My bad...
> 
> kernel is 2.6.32-642.11.1.el6.centos.plus.x86_64
> mdadm.x86_64 is 3.3.4-1.el6_8.5
> 
OUCH!

I don't know how far the kernel and mdadm have come since then, and what
has or has not been backported, but it sounds like you want a modern
rescue CD.

I'd be inclined to get something like SystemRescueCD
https://www.system-rescue-cd.org/SystemRescueCd_Homepage and see if the
mdadm and kernel on that work any better. It wouldn't surprise me if
they do.

Cheers,
Wol