centos 7 zfs on root

сам процесс

yum install kernel-devel zfs gdisk zfs-dracut
sed -i 's#ZFS=${rpool}${bootfs}##' /etc/grub.d/10_linux
sed -i 's#ZPOOL_IMPORT_OPTS=""#ZPOOL_IMPORT_OPTS="-d /dev/disk/by-partlabel"#' /usr/lib/dracut/modules.d/90zfs/zfs-lib.sh

for i in b c d; do
 sgdisk -g \
  -n 1:2048:2099199 /dev/sd${i} \
  -t 1:ef02 /dev/sd${i} \
  -c 1:boot-${i} \
  -n 2:2099200:18876415 /dev/sd${i} \
  -t 2:fd00 /dev/sd${i} \
  -c 2:swap-${i} \
  -n 3:18876416:1629487070 /dev/sd${i} \
  -t 3:bf00 /dev/sd${i} \
  -c 3:main-${i}
done

mdadm --create /dev/md22 \
 --level=1 --raid-devices=3 \
 /dev/sdb2 \
 /dev/sdc2 \
 /dev/sdd2
mkswap -L swap-m /dev/md22

zpool create \
 -o ashift=12 \
 -O compression=lz4 \
 zroot \
 raidz2 /dev/disk/by-partlabel/main-[b-d]
zfs create zroot/centos7-01

mkdir /mnt/tmp
mount --bind / /mnt/tmp
rsync -avPX /mnt/tmp/. /zroot/centos7-01/.
umount /mnt/tmp

cat <<EOF >/zroot/centos7-01/etc/fstab
LABEL=boot-m /boot ext4 defaults 0 0
LABEL=swap-m swap swap defaults 0 0
EOF

mdadm --create /dev/md11 \
 --level=1 --raid-devices=3 \
 /dev/sdb1 \
 /dev/sdc1 \
 /dev/sdd1
mkfs.ext4 -L boot-m /dev/md11
mount /dev/md11 /zroot/centos7-01/boot

mount --bind /boot /mnt/tmp
rsync -avPX /mnt/tmp/. /zroot/centos7-01/boot/.
umount /mnt/tmp

for dir in proc sys dev; do
 mount --bind /$dir /zroot/centos7-01/$dir
done

chroot /zroot/centos7-01

vi /etc/default/grub
GRUB_CMDLINE_LINUX="crashkernel=auto root=zfs:zroot/centos7-01"

mdadm --examine --scan |
 sed 's# /dev/md/# /dev/md#g' >/etc/mdadm.conf
ln -s /dev/disk/by-partlabel/* /dev
dracut -f -v /boot/initramfs-$(uname -r).img $(uname -r)
grub2-mkconfig -o /boot/grub2/grub.cfg
grep root /boot/grub2/grub.cfg
for d in /dev/sd[b-d]; do
 grub2-install --boot-directory=/boot ${d}
done

exit

полезные ссылки

1. ​https://github.com/zfsonlinux/pkg-zfs/wiki/HOWTO-install-EL7-(CentOS-RHEL)-to-a-Native-ZFS-Root-Filesystem
2. ​https://habrahabr.ru/post/268711/