Comment 35 for bug 315735

Still More information...

I changed /usr/share/initramfs-tools/scripts/local-top/dmraid :

for dev in $(dmraid -r -c); do
        dmraid-activate $dev
done

to show

for dev in $(dmraid -r -c); do
        echo "Activating $dev..."
        dmraid-activate $dev
done

And what I got was:

Activating no...
no block devices found
Activating block...
no block devices found
Activating devices...
no block devices found
Activating found...
no block devices found

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This makes me think that dmraid -r -c response is cleary:
"no block devices found"

But why?!