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http://askubuntu.com/questions/57908/how-can-i-quickly-copy-a-gpt-partition-scheme-from-one-hard-drive-to-another

Copy GPT /dev/sdX to /dev/sdY (be CAREFUL):

sgdisk -R /dev/sdY /dev/sdX

Randomize GUID:

sgdisk -G /dev/sdY

View details of raid device:

mdadm --detail /dev/mdY

Remove device if nesessary:

mdadm /dev/md4 -r /dev/sdY4

Add the device again:

mdadm /dev/md4 -a /dev/sdY4

Install Grub on the new disk:

grub-install /dev/sdY