can't boot from sda

[mauro-miatello]

when I reboot, my server start from sda and gives error
so I booted from sdb and re-try to install grub but after I've done:

grub-install /dev/sda

I have

Installing for i386-pc platform.
grub-install: warning: this GPT partition label contains no BIOS Boot Partition; embedding won't be possible.
grub-install: error: embedding is not possible, but this is required for RAID and LVM install.

I've checked with fdisk and 2 disks seems identical

[Concord82]

You need to change the label type, from boot to bios_grub for example through parted:

parted /dev/sda
set 1 boot off
set 1 bios_grub on
q

Then again:

grub2-install /dev/sda