1}sfdisk -d /dev/sda | sfdisk --force /dev/sdb
2}fdisk /dev/sdb - zmena 1,2part na fd
3)mdadm --create /dev/md0 --verbose --level=1 --raid-devices=2 missing /dev/sdb1
mdadm --create /dev/md1 --verbose --level=1 --raid-devices=2 missing /dev/sdb2
4)mdadm --examine --scan >> /etc/mdadm.conf
5)mkfs.ext4 /dev/md0
6)mkdir /mnt/boot
mount /dev/md0 /mnt/boot
cp -dpRx /boot/* /mnt/boot
umount /mnt/boot
umount /boot
mount /dev/md0 /boot
change fstab to mount /boot from /dev/md0
7)fdisk /dev/sda part 1 to fe
mdadm --add /dev/md0 /dev/sda1
pvcreate -v /dev/md1
vgextend -v centos/dev/md1
pvmove -v /dev/sda2 /dev/md1
vgreduce -v sysvg /dev/sda2
pvremove -v /dev/sda2
8)fdisk /dev/sda change 2part. to fd
mdadm --add /dev/md1 /dev/sda2
9)vim /etc/default/grub -> pridat rd.auto=1
dracut /boot/initramfs-$(uname -r).img $(uname -r)
grub2-mkconfig -o /boot/grub2/grub.cfg && grub2-install /dev/sdb
grub2-install /dev/sda
menuentry 'CentOS Linux (3.10.0-327.4.5.el7.x86_64) 7 (Core)' --class centos --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-3.10.0-327.4.5.el7.x86_64-advanced-d535fde5-350e-4f9e-934a-2b45594c442a' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod diskfilter
insmod mdraid1x
insmod ext2
set root='mduuid/e553c7678f70cd932018b2f0cc458d89'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint='mduuid/e553c7678f70cd932018b2f0cc458d89' d1b805f8-2af3-450b-920e-546c4d723b33
else
search --no-floppy --fs-uuid --set=root d1b805f8-2af3-450b-920e-546c4d723b33
fi
linux16 /vmlinuz-3.10.0-327.4.5.el7.x86_64 root=/dev/mapper/centos-root ro crashkernel=auto rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb rd.auto=1 quiet
initrd16 /initramfs-3.10.0-327.4.5.el7.x86_64.img
}
/dev/md1: UUID="SMiMEO-XJ07-d7jF-0D8l-cxD7-wzKa-V62dRv" TYPE="LVM2_member"
/dev/md0: UUID="d1b805f8-2af3-450b-920e-546c4d723b33" TYPE="ext4"
fstab
/dev/mapper/centos-root / xfs defaults 0 0
/dev/md0 /boot ext4 defaults 0 0
#/dev/mapper/centos-swap swap swap defaults 0 0