funtoo_zfs_install

boot.conf

boot {
	generate grub
	default "Funtoo ZFS"
	timeout 4
}

"Funtoo Linux" {
	kernel bzImage[-v]
}

"Funtoo ZFS" {
	kernel vmlinuz[-v]
	initrd initramfs-genkernel-x86_64[-v]
	params real_root=ZFS=rpool/ROOT/funtoo
	params += dozfs
}

fstab

# /etc/fstab: static file system information.
#
# <fs>          <mountpoint>    <type>      <opts>      <dump/pass>

/dev/sda3       none            swap        sw          0 0
/dev/sda2       /boot           ext3        defaults    1 2

funtoo_zfs_install.sh

#!/usr/bin/env bash

echo -e "\e[00;31mPlease set your root password....\e[00m"
if [ -z $1 ]
  then echo -e "\e[00;31mno passwd arg\e[00m"
  exit 1
fi
export ROOTPASS=$1

echo -e "\e[00;31mDownloading stage3....\e[00m"
cd /root
wget http://ftp.osuosl.org/pub/funtoo/funtoo-current/x86-64bit/generic_64/stage3-latest.tar.xz

echo -e "\e[00;31mPartitioning disk....\e[00m"
sgdisk -Z -n 1:2048:67583\
          -n 2:67584:591871\
          -n 3:591872:4786176\
          -N 4\
          -t 1:ef02\
          -t 2:8300\
          -t 3:8200\
          -t 4:bf01\
          -g /dev/sda

echo -e "\e[00;31mFormatting boot....\e[00m"
mkfs.ext3 /dev/sda2

echo -e "\e[00;31mMaking swap....\e[00m"
mkswap /dev/sda3

echo -e "\e[00;31mSwitching on swap....\e[00m"
swapon /dev/sda3

echo -e "\e[00;31mCreating ZFS pool....\e[00m"
zpool create -f -o ashift=9 -o cachefile= -O compression=on -m none -R /mnt/funtoo rpool /dev/sda4

echo -e "\e[00;31mSetting up ZFS volumes....\e[00m"
zfs create rpool/ROOT
zfs create -o mountpoint=/ rpool/ROOT/funtoo
zfs create -o mountpoint=/home rpool/HOME
zfs create rpool/FUNTOO
zfs create -o mountpoint=/usr/portage -o compression=off rpool/FUNTOO/portage
zfs create -o mountpoint=/usr/portage/distfiles rpool/FUNTOO/portage/distfiles
zfs create -o mountpoint=/usr/portage/packages rpool/FUNTOO/portage/packages
zfs create -o mountpoint=/usr/src rpool/FUNTOO/src
zpool set cachefile=/etc/zfs/zpool.cache rpool
mkdir -p /mnt/funtoo/etc/zfs
cp /etc/zfs/zpool.cache /mnt/funtoo/etc/zfs/zpool.cache

echo -e "\e[00;31mPreparing stage3....\e[00m"
cd /mnt/funtoo
cp /root/stage3-latest.tar.xz .
tar xJpf stage3-latest.tar.xz
rm stage3-latest.tar.xz
mount /dev/sda2 boot
mount -t proc none proc
mount --rbind /dev dev
mount --rbind /sys sys
cp /etc/resolv.conf /mnt/funtoo/etc/

echo -e "\e[00;31mInstalling Funtoo....\e[00m"
env HOME=/root TERM=$TERM ROOTPASS=$ROOTPASS chroot /mnt/funtoo /bin/bash <<-CHROOT
cat /proc/mounts > /etc/mtab
echo noop > /sys/block/sda/queue/scheduler

echo -e "\e[00;32m(1) Syncing the portage tree....\e[00m"
emerge --sync

curl -L http://goo.gl/bn4HEk -o /etc/fstab
curl -L http://goo.gl/Sa8umk -o /etc/boot.conf

echo -e "\e[00;32m(2) Building linux kernel....\e[00m"
emerge -v vim the_silver_searcher gentoo-sources
cd /usr/src/linux
make defconfig
make localmodconfig
cat >> .config <<-KERN
CONFIG_CRYPTO_DEFLATE=y
CONFIG_ZLIB_DEFLATE=y
KERN
make bzImage modules
make install
make modules_install

echo -e "\e[00;32m(3) Setting up ZFS kernel modules....\e[00m"
emerge zfs genkernel

echo -e "\e[00;32m(4) Setting up GRUB....\e[00m"
hostid > /etc/hostid

echo "sys-boot/grub libzfs" >> /etc/portage/package.use
emerge grub
grub-install --no-floppy /dev/sda
cat /proc/mounts | grep -v rootfs > /etc/mtab

boot-update

echo -e "\e[00;32m(5) Generating initramfs....\e[00m"
genkernel --zfs --no-clean --no-mrproper --loglevel=5 initramfs > /var/log/genkernel-initramfs.log

echo -e "\e[00;32m(6) Finishing Funtoo installation....\e[00m"
rc-update add zfs boot
rc-update add dhcpcd default
rc-update add sshd default
chpasswd <<-CHPW
root:$ROOTPASS
CHPW
exit
CHROOT
unset ROOTPASS

echo -e "\e[00;31mSwitching off swap....\e[00m"
swapoff /dev/sda3

echo -e "\e[00;31mCleaning up....\e[00m"
umount -l proc dev sys boot
cd /
zpool export rpool

echo -e "\e[00;31mdone! \e[00m"
reboot
exit 0

Interesting. When was this last tested? For the kernel configuration, I did need the following too:

CONFIG_KALLSYMS=y
CONFIG_PREEMPT_NONE=y

Not required any more? I think they are.