From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wols Lists <antlists@youngman.org.uk>
Subject: Re: GRUB warning after replacing disk drive in RAID1
Date: Thu, 2 Mar 2017 13:17:52 +0000
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To: Phil Turmel <philip@turmel.org>, Peter Sangas <pete@wnsdev.com>, 'Reindl Harald' <h.reindl@thelounge.net>, linux-raid@vger.kernel.org
List-Id: linux-raid.ids

On 01/03/17 18:29, Phil Turmel wrote:
> Since this worked before, I would guess your grub was updated and its md
> support was left out.  Hopefully someone with more grub experience can
> chip in here -- I don't use any bootloader on my servers any more.

Look at the raid wiki

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

it mentions grub.

Also, look up grub2 and raid on the gentoo wiki - I wrote a lot of that,
and arch also apparently has very good documentation.

Cheers,
Wol