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: Tue, 7 Mar 2017 12:54:19 +0000
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To: Peter Sangas <pete@wnsdev.com>, 'Phil Turmel' <philip@turmel.org>, 'Reindl Harald' <h.reindl@thelounge.net>, linux-raid@vger.kernel.org
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On 06/03/17 22:13, Peter Sangas wrote:
> In addition,  the wiki says " you will need to configure your distro to use an initramfs.
> 
> here are the last few lines of my grub.cnf: 
> 
>          echo    'Loading Linux 4.4.0-36-generic ...'
>          linux    /vmlinuz-4.4.0-36-generic root=UUID=cddffa50-9713-4205-aab6-86745735958b ro recovery nomodeset 
>          echo    'Loading initial ramdisk ...'
>          initrd   /initrd.img-4.4.0-36-generic
> 
> should I be concerned my grub.cnf uses initrd.img and not initramfs?   My grub.cnf was last modified 11/2016 and I've rebooted successfully into a RAID1 since.

I think your problem is right there !!!

Look at the wiki, but I can NOT see the magic command "domdadm", without
which mdadm doesn't get loaded and the array doesn't get assembled. No
array, no root, no system ...

(Oh - initrd, initramfs, they're probably the same thing. :-)

Cheers,
Wol