1) Boot a server in rescue mode
2) Check partitions
[[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) mount partitions
[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) grub2 intallation
[[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) grub.cfg configuring
[[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) exit and reboot
ctrl+C
ctrl+D
[email protected]:~# reboot
