1) Загружаем сервер в rescue
2) Смотрим разделы:

[[email protected] /]# fdisk -l

Disk /dev/sda: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: gpt

Disk identifier: 961524F0-9337-4FC8-B4AD-C65D8750BF58

Device          Start        End    Sectors  Size Type

/dev/sda1        2048    1048575    1046528  511M EFI System

/dev/sda2     1048576 7812980735 7811932160  3.7T Linux RAID

/dev/sda3  7812980736 7814027263    1046528  511M Linux swap

Disk /dev/sdb: 3.7 TiB, 4000787030016 bytes, 7814037168 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: gpt

Disk identifier: 129DD84C-61D3-464B-910D-E87055EE5C4A

Device          Start        End    Sectors  Size Type

/dev/sdb1        2048    1048575    1046528  511M EFI System

/dev/sdb2     1048576 7812980735 7811932160  3.7T Linux RAID

/dev/sdb3  7812980736 7814027263    1046528  511M Linux swap

Disk /dev/md2: 3.7 TiB, 3999709200384 bytes, 7811932032 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

3) Монтируем разделы

[email protected]:~# mount /dev/md2 /mnt/

[email protected]:~# mount –bind /dev/ /mnt/dev

[email protected]:~# mount –bind /sys /mnt/sys

[email protected]:~# mount –bind /proc /mnt/proc

[email protected]:~# chroot /mnt

[[email protected] /]# mount /dev/sda1 /mnt/boot/efi/

4) Устанавливаем grub2

[[email protected] /]# grub2-install –target=x86_64-efi –efi-directory=/boot/efi –bootloader-id=grub –recheck

Installing for x86_64-efi platform.

Installation finished. No error reported.

5) Формируем grub.cfg 

[[email protected] /]# grub2-mkconfig -o /boot/grub2/grub.cfg

Generating grub configuration file …

Found linux image: /boot/bzImage-3.14.32-xxxx-grs-ipv6-64

Found linux image: /boot/vmlinuz-3.10.0-693.5.2.el7.x86_64

Found initrd image: /boot/initramfs-3.10.0-693.5.2.el7.x86_64.img

Found linux image: /boot/vmlinuz-3.10.0-693.2.2.el7.x86_64

Found initrd image: /boot/initramfs-3.10.0-693.2.2.el7.x86_64.img

Found linux image: /boot/vmlinuz-0-rescue-1e98a4cc1263468b9f9a12e365316b95

Found initrd image: /boot/initramfs-0-rescue-1e98a4cc1263468b9f9a12e365316b95.img

Done

6) Выходим и перезагружаем сервер.


ctrl+C
ctrl+D
[email protected]:~# reboot