Hi all,
today I experienced GRUB 2.02 was not able to boot successfully a QEMU based virtual machine in
BIOS mode from a GPT partitioned virtual disk when the root partition (containing /boot)
exceeds 2 TB even when a there is a tiny bios_grub partition (ef02) exists at the beginning of
the disk.
I was dropped to the GRUB rescue shell but was not able to load any modules: "attempt to read
or write outside of disk 'hd0'".
I booted into a rescue system and reinstalled grub (update-grub/grub-install) without any error
message or warning. Sadly no success.
After that I did some experiments. Reinstalled the system but assigned only 1 TB to the
root/swap partition. The system booted successfully. After that I increased the partition to 4
TB and increased the filesystem. GRUB was still able to boot.
I suppose the problem occurs when (after stage 1 and 1.5 have been successfully loaded) parts
of stage 2 (modules from /boot/grub...) have to been loaded from disk sectors beyond the 2 TB
limit.
Can you confirm that not only the bios_grub partition but also /boot/grub has to be located in
the first 2 TB of the disk?
Thanks in advance,
Michael
