Help concerning grup and lvm partitions after installation

Hello, I just recently installed arch-linux according to this installation guide:
https://wiki.archlinux.de/title/UEFI_Installation
Therefore I decided to use the following partitions:
/dev/sda1 -> 1GB EFI boot
/dev/sda2 -> swap
/dev/sda3 -> split up to 2 partitions via lvm for /boot/ and /home as described in the guide.
then I installed the UEFI grup without any errors and after reboot it did not work:
I got the following errors:
hwdb.bin does not exist, please run udevadm hwdb --update
ERROR: device 'UUID=...' not found
ERROR: Unable to find root device 'UUID=...'
and an emergency shell appeared..
Well first I thought of my fstab, but all partitions are mentioned there correctly.
Then I looked the errors up in the internet and tried to reinstall mkinitcpio as well as a reuse of:  mkinitcpio -p linux
Nothing happened, still the same.
I only followed the steps mentioned in the installation guide and before reboot everything looked pretty good.
Does grub maybe interfier with lvm ?
In a nutshell, I have no single clue why it does not work, so hopefully one of you knows why
Thanks already
Last edited by archr00t (2014-11-15 20:55:02)

Hello there,
1. You have a UEFI system. As such, the UEFI partition (/dev/sda1) serves as your boot partition (e.g. mounted at /boot or /boot/efi). You don't need to create another one on top of that! That would be a big part of your problem.
2. Your extra /boot partition is also LVM, which UEFI cannot handle. For UEFI systems, there must therefore be a seperate boot partition, and it CANNOT be LVM. Root, Home, and Swap are fine, but not the UEFI (i.e. /boot) partition.
3. Even if it were a BIOS system, you also need to manually edit the grub configuration file to sucessfully boot where /boot is LVM.

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