#dd if=/dev/zero of=test.img bs=8k count=1024k
1048576+0 записей получено
1048576+0 записей отправлено
 скопировано 8589934592 байта (8,6 GB), 14,6679 c, 586 MB/c
#dd if=/dev/zero of=test.img bs=8k count=2048k
2097152+0 записей получено
2097152+0 записей отправлено
 скопировано 17179869184 байта (17 GB), 29,1174 c, 590 MB/c
#dd if=/dev/zero of=test.img bs=8k count=4096k
4194304+0 записей получено
4194304+0 записей отправлено
 скопировано 34359738368 байт (34 GB), 57,9869 c, 593 MB/c
#dd if=/dev/zero of=test.img bs=8k count=8192k
8388608+0 записей получено
8388608+0 записей отправлено
 скопировано 68719476736 байт (69 GB), 117,426 c, 585 MB/c

-rw-r--r-- 1 root root 64G 13-02-03 191806 test.img

GEEKSOURCES_PATCHING_ORDER="aufs bfq bld branding ck fbcondecor fedora grsecurity ice imq mageia pardus pld reiser4 rt suse uksm vserver zfs"

echo 'sys-fs/zfs -kernel-builtin' >> /etc/portage/profile/package.use.mask 
echo 'sys-fs/zfs kernel-builtin' >> /etc/portage/package.use 
echo 'sys-kernel/geek-sources zfs' >> /etc/portage/package.use 
USE="zfs" emerge sys-kernel/geek-sources

CONFIG_KALLSYMS=y

#zgrep CONFIG_PREEMPT /proc/config.gz
# CONFIG_PREEMPT_RCU is not set
CONFIG_PREEMPT_NOTIFIERS=y
CONFIG_PREEMPT_NONE=y
# CONFIG_PREEMPT_VOLUNTARY is not set
# CONFIG_PREEMPT is not set

#insmod /lib64/modules/3.7.4-gentoo/addon/zfs/zfs/zfs.ko

# Bind over pseudo-filesystems
    $ mount -t proc none /mnt/gentoo/proc
    $ mount --rbind /dev /mnt/gentoo/dev
    $ chroot /mnt/gentoo /bin/bash
    $ env-update && source /etc/profile
    $ emerge -v =sys-boot/grub-1.99_rc99

# Setup the config file
$ cat /proc/mounts | grep -v rootfs > /etc/mtab
$ grub-mkconfig -o /boot/grub/grub.cfg

$ grub-install /dev/sdb

#cat /proc/mounts | grep -v rootfs > /etc/mtab
#grub2-mkconfig -o /boot/grub2/grub.cfg
Генерируется grub.cfg …
Найден образ linux: /boot/kernel-genkernel-x86_64-3.7.5-geek
Найден образ initrd: /boot/initramfs-genkernel-x86_64-3.7.5-geek
Найден Gentoo Base System release 2.1 на /dev/sdb2
Найден Debian GNU/Linux (7.0) на /dev/sdb6
завершено

# make -C /usr/src/linux modules_prepare 
# env EXTRA_ECONF='--enable-linux-builtin' ebuild /usr/portage/sys-kernel/spl/spl-0.6.0_rc14.ebuild clean configure
# cd /var/tmp/portage/sys-kernel/spl-0.6.0_rc14/work/spl-spl-0.6.0-rc14
# ./copy-builtin /usr/src/linux

# env EXTRA_ECONF='--with-spl=/usr/src/linux --enable-linux-builtin' ebuild /usr/portage/sys-fs/zfs-kmod/zfs-kmod-0.6.0_rc14.ebuild clean configure
# cd /var/tmp/portage/sys-fs/zfs-kmod-0.6.0_rc14/work/zfs-zfs-0.6.0-rc14  
# ./copy-builtin /usr/src/linux

#eselect kernel list
Available kernel symlink targets:
  [1]   linux-3.7.4-gentoo *

When you get up to the kernel, make sure that you disable the CFQ scheduler, and turn on No-op (It's the default one once you disable all schedulers). The reason for this is because ZFS has its own scheduler and the CFQ one conflicts with it. Go to your kernel config, and make sure you have the following: (there should be a /usr/src/linux symlink as well)

ZLIB_INFLATE/DEFLATE must be compiled into the kernel (not as a module).
> ZLIB_INFLATE [=y], ZLIB_DEFLATE [=y]

General setup --->
> [*] Initial RAM filesystem and RAM disk (initramfs/initrd) support
> () Initramfs source file(s)

[*] Enable loadable module support --->
[*] Module unloading

Device Drivers --->
> Generic Driver Options --->
>> [*] Maintain a devtmpfs filesystem to mount at /dev

Cryptographic API --->
<*> Deflate compression algorithm
<*> Zlib compression algorithm