Installing and creating a configuration for GRUB (Ubuntu 18, RAID1, LVM). Problems

Maxy

1/6/24, 8:28 AM

There is my config (VirtualBox):

    sda                   8:0    0   10G  0 disk
├─sda1                8:1    0  512M  0 part  /boot/efi
└─sda2                8:2    0  8.5G  0 part
  └─vg0-lv0         253:0    0  8.5G  0 lvm   /
sdb                   8:16   0   15G  0 disk
├─sdb1                8:17   0  512M  0 part
└─sdb2                8:18   0 14.5G  0 part
  └─md0               9:0    0 14.5G  0 raid1
    └─datavg-datalv 253:1    0 14.5G  0 lvm
sdc                   8:32   0   15G  0 disk
├─sdc1                8:33   0  512M  0 part
└─sdc2                8:34   0 14.5G  0 part
  └─md0               9:0    0 14.5G  0 raid1
    └─datavg-datalv 253:1    0 14.5G  0 lvm
sr0                  11:0    1 50.5M  0 rom

Now my system boots successfully, I see GRUB menu. I'm doing a system disk transfer from lv0 to datalv. After that I ran into a problem installing GRUB and creating a config file for it.

How I did:

sudo mount /dev/datavg/datalv /mnt 
sudo mount /dev/sdb1 /mnt/boot/efi

sudo mount --bind /dev /mnt/dev &&
sudo mount --bind /dev/pts /mnt/dev/pts &&
sudo mount --bind /proc /mnt/proc &&
sudo mount --bind /sys /mnt/sys

sudo chroot /mnt

grub-install --target=x86_64-efi /dev/sdb

grub-install --recheck /dev/sdb

exit &&
sudo umount /mnt/sys &&
sudo umount /mnt/proc &&
sudo umount /mnt/dev/pts &&
sudo umount /mnt/dev &&
sudo umount /mnt

After that, I disconnect the system disk (sda) and try to boot from sdb. Unfortunately I get a broken GRUB. I see the just grub> console (not resque).

I want to install GRUB on 2 disks sdb1 and sdc1 and specify in grub.cfg that my system is on LVM (datavg/datalv).

Please point out my mistakes to me. What am I doing wrong? Am I going to have to clone sda1 and manually edit that awful file grub.cfg?

Thanks!

0 + 3

grub2

lvm

oldfred

1/6/24, 3:44 PM

Grub normally installs to ESP - efi system partition on first drive. Check your fstab. I prefer to have an ESP on every drive, but not required. You also cannot have duplicate UUIDs. But if RAID, I assume then duplicates are allowed?

Maxy

1/8/24, 7:05 AM

``` fdisk /dev/sdb или sdc for 1 partition: ``` Device: /dev/sdb1 Start: 2048 End: 1050623 Sectors: 1048576 Size: 512M Type: EFI System ``` However, on ``` grub-install /dev/sdb ``` i get installation to sda disk. The only thing I want to do is to make new the config file for a specific disk like /dev/sdb, sdc ``` grub-mkconfig -o /boot/grub/grub.cfg ``` But it doesn't work even when I do a chroot.

oldfred

1/8/24, 3:06 PM

If you are getting grub install to sda, then your fdisk has the UUID of an ESP on sda. Change fstab to have UUID of ESP you want, then run `sudo grub-install` and it will use ESP in fstab.

Elon Musk

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EN: Installing and creating a configuration for GRUB (Ubuntu 18, RAID1, LVM). Problems

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