From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?UTF-8?B?SsOpcsO0bWUgUG91bGlu?= <jeromepoulin@gmail.com>
Subject: Re: Converting RAID1 to RAID5
Date: Thu, 15 Sep 2011 22:54:12 -0400
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To: Alex <mysqlstudent@gmail.com>
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On 2011-09-15, at 19:50, Alex <mysqlstudent@gmail.com> wrote:

> When I try to grow the other two partitions (/ and /home), it fails
> with device busy:
>
> # mdadm --grow /dev/md2 --level=5 --raid-devices=3
> mdadm: level of /dev/md2 changed to raid5
> mdadm: Need to backup 128K of critical section..
> mdadm: Cannot set device shape for /dev/md2: Device or resource busy
>       Bitmap must be removed before shape can be changed
> mdadm: aborting level change
>

You must remove the bitmap first as told using mdadm --grow --bitmap=none

>
> When the conversion to RAID5 is complete, how can I regenerate the
> mdadm.conf to properly reflect the change?
>

The output of mdadm -Es might be enough for you.