GPT boot with ZFS RAIDZ "ZFS: i/o error - all block copies unavailable "

[alteriks at gmail.com]

Yesterday I tried installing FreeBSD once more, twice to be frank.
I downloaded amd64 8.0-RC2 checked md5 sum. First time I installed it on 
physical machine.

I created script with commands pasted here:
http://pastebin.com/f72813264
After that I executed:

chroot /zroot
mount -t devfs devfs /dev
export DESTDIR=""
cd /usr/src/sys/boot/
make obj
make depend
make
cd i386/loader
make install
umount /dev
passwd
exit
cp /boot/zfs/zpool.cache /zroot/boot/zfs/zpool.cache

Finally I launched this script:
http://pastebin.com/f1449f548

Restart gave me:
>GPT boot with ZFS RAIDZ "ZFS: i/o error - all block copies	unavailable

I created virtual machine on linux kvm, and added three drives. After starting 
system boot loader failed to launch with same error.

I tried to reinstall FreeBSD under kvm, but it didn't help.

Anyone has succeed installing amd64 8.0-RC2 with raidz1 on gpt drives?