Linux raid wiki - setting up a system - advice wanted :-)

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This is a great way for learning lots about raid :-)

I'm planning a section on setting up a new system, and I need to know
what will happen if you give entire drives to mdadm.

Does it leave the first 2 megs empty? Basically, what I'm asking is if I do

mdadm --create /dev/md/bigarray -add /dev/sda /dev/sdb /dev/sdc

(note I am passing the entire drive, not the first partition) and then I
install grub on those drives, will I trash the array?

Cheers,
Wol
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