How does one assemble a DDF or IMSM array?

[Wakko Warner <wakko@animx.eu.org>]

I've not used DDF or IMSM arrays much.

I understand that the devices (ie /dev/sda and /dev/sdb) are the containers.

I know that one can use mdadm -I on the devices and it will create mdXXX
(last I tried it was 127) and then will create mdXXX for each virtual disk
in the container and they will just work.

If I do mdadm -A /dev/mdXXX, how would one get the volumes inside started?
I tried mdadm -I /dev/mdXXX after mdadm -A.  It created mdXXX where XXX is
-2 from the first one (it 127 being the container and 125 being there but
not in a state that works)

Does DDF/IMSM require mdadm.conf to work when using -A?

I'm not sure if I'm making myself very clear here or not.

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