Setup grub2 on a GPT software raid 3 TB HDD

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http://serverfault.com – I like to setup grub2 on a GPT softare raid 3 TB HDD. Number Start (sector) End (sector) Size Code Name 1 2048 1050623 512.0 MiB FD00 Linux RAID 2 1050624 5860533134 2.7 TiB FD00 Linux RAID The first partition is boot, the second is LVM. After bootstrapping I installed grub2 which died with "missing BIOS boot". But I can't change partition 1 to BIOS boot because of the software raid, right? How to solve this situation? Info: Debian Wheezy x86_64 (HowTos)