/etc/mdadm# diff mdadm.conf mdadm.conf.broken
21c21
< ARRAY /dev/md2 level=raid1 num-devices=2
UUID=52978f9a52:9540e417:e3565b0a:1da235 name=bluebottle:2
---
> ARRAY /dev/md2 level=raid1 metadata=1 num-devices=2
UUID=52978f9a52:9540e417:e3565b0a:1da235 name=bluebottle:2
The above is a diff between two versions of mdadm.conf. The presence
of "metadata=1" results in mkinitramfs producing an image that won't boot.
Removing that (while leaving the "name=" section) results in making an
initramfs that works.
Also note that I didn't use knoppix or any other distribution for this. I
created the software RAID-1 with Debian/Etch and chose the latest metadata
format. See below for more details about my RAIDs.
# cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sdb2[0] sda2[2]
976567116 blocks super 1.2 [2/2] [UU]
bitmap: 0/8 pages [0KB], 65536KB chunk
md0 : active raid1 sda1[0] sdb1[1]
192640 blocks [2/2] [UU]
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