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Re: How to Boot with LVM

ray a écrit :
> On Tuesday, September 8, 2015 at 8:10:08 AM UTC-5, Pascal Hambourg wrote:
>> After booting the HDD system with rEFInd, running 'grub-install' should
>> reinstall the bootloader properly. See also useful options in my
>> previous message.
> Yes, it is now booting.  This is with the rEFInd stick:
> root@mc:/boot/efi/EFI# mount /dev/sdf1 /boot/efi
> mount: /dev/sdf1 is already mounted or /boot/efi busy
>        /dev/sdf1 is already mounted on /boot/efi

Which instance did you boot with rEFInd ?
/dev/sdf is one of the SSD used for RAID 0 and LVM, right ?

> root@mc:/boot/efi/EFI# apt-get install --reinstall grub-efi

Note that grub-efi is a dummy package which depends on either
grub-efi-amd64 or grub-efi-ia32 depending on the installed architecture.
Reinstalling it does nothing.

> root@mc:/boot/efi/EFI# grub-install /dev/sdf
> Installing for x86_64-efi platform.
> Installation finished. No error reported.

The device name is not used by grub-install with an EFI target.
You could have tried to use the option --boot-loader-id I mentionned in
a previous post.

> root@mc:/boot/efi/EFI# file /boot/efi/EFI/debian/grubx64.efi
> /boot/efi/EFI/debian/grubx64.efi: PE32+ executable (EFI application) x86-64 (stripped to external PDB), for MS Windows
> root@mc:/boot/efi/EFI# efibootmgr --verbose | grep debian
> Boot0000* debian    HD(1,GPT,87471e98-b814-4aa9-b2bc-ea4669c75565,0x800,0x100000)/File(\EFI\debian\grubx64.efi)

Looks as expected. You can check with blkid which partition has
PARTUUID=87471e98-b814-4aa9-b2bc-ea4669c75565. If you wonder about the
formard / in the boot entry pathname, that's because the UEFI uses
MS-style path.

> A baffling point:  In rEFInd the path is /boot/efi/EFI/debian/grubx64.efi

How is it baffling ? The EFI system partition is mounted on /boot/efi
and the path relative to the partition filesystem root is
/EFI/debian/grubx64.efi. The EFI firmware does not care about where you
mount the EFI system partition.

> After booting up into the HDD instance, I get:

Booting how ? On its own or from rEFInd ?

> root@RoxTor:/boot# ls -a
> .   config-4.0.0-2-amd64  grub                System.map-4.0.0-2-amd64
> ..  efi              initrd.img-4.0.0-2-amd64  vmlinuz-4.0.0-2-amd64
> root@RoxTor:/boot# cd grub
> root@RoxTor:/boot/grub# ls -a
> .  ..  fonts  grub.cfg    grubenv  locale  unicode.pf2  x86_64-efi

So far so good.

> root@RoxTor:~# cd /boot
> root@RoxTor:/boot# cd efi
> root@RoxTor:/boot/efi# ls -a
> .  ..
> This is nothing past /boot/efi

What's mounted on /boot/efi ?

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