Re: How to Boot with LVM
On Thursday, September 10, 2015 at 11:10:05 AM UTC-5, David Wright wrote:
> Quoting ray :
> > On Wednesday, September 9, 2015 at 2:10:04 PM UTC-5, Pascal Hambourg wrote:
> > > ray a écrit :
> [...]
> > > > 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.
> > Baffling: Viewing with rEFInd, I see /boot/efi/EFI/debian/grubx64.efi
>
> [...]
>
> > > What's mounted on /boot/efi ?
> > I am not sure what it means 'what's mounted on ...'.
>
> Yes, it does seem to me that you don't understand the concept of
> mounting.
>
> You have a partition containing a filesystem which contains the sole
> pathname EFI/debian/grubx64.efi as shown by
> https://lists.debian.org/debian-user/2015/09/msg00273.html
> listed under Fs8. EFI is the topmost directory, and that name is
> probably obligatory. Within it can be any number of different
> directories for different OSes that you might be booting, in this case
> just debian. Within EFI/debian/ is grub's own file.
>
> You can mount a filesystem (in a partition) onto any existing
> directory, and you've chosen to mount on /boot/efi. Normally,
> mountpoints are empty directories like this, set up for that purpose,
> but in general they don't have to be. (However, if you mount a
> filesystem onto a non-empty directory, any previous contents will he
> hidden until you unmount the filesystem again.)
>
> When you mount your filesystem onto your mountpoint, the files in
> the filesystem will now appear under the mountpoint-directory.
> Thus you get:
>
> mountpoint
> ↓↓↓↓↓↓↓↓↓
> /boot/efi/EFI/debian/grubx64.efi
> ↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑↑
> filesystem paths
>
> There's a couple of diagrams of this at
> http://www.linuxchix.org/content/courses/filesystem/Lesson1.html
> where /boot/efi ↔ /floppy and EFI/debian/grubx64.efi ↔ fun/Lesson1.html
>
> Cheers,
> David.
I have read the Lesson1 before and did not catch on. It took rereading these messages and exercising the system to get a little grip on this. Your perspective has been significantly different from the Lesson1 and others I have read and thus yours has been very helpful.
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