grub2 set root

[Patrick Dupre]

Hello,

How can I understand this:
set root='lvmid/W6k0N8-5JlY-Xntk-w8Yi-Ss1F-I0IY-VzPRU3/vE133D-nAZ8-ltwF-2o4x-H6Cs-a9l5-19IRw4'

It is not in the list of partitions

Can I change it?
In the past it was clearer (probably before efi)

===========================================================================
 Patrick DUPRÉ                                 | | email: [e-mail]
 Laboratoire interdisciplinaire Carnot de Bourgogne
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===========================================================================

[Chris Murphy]

On Wed, Jun 26, 2019 at 7:18 AM Patrick Dupre  wrote:
> Hello,
>
> How can I understand this:
> set root='lvmid/W6k0N8-5JlY-Xntk-w8Yi-Ss1F-I0IY-VzPRU3/vE133D-nAZ8-ltwF-2o4x-H6Cs-a9l5-19IRw4'

That looks like two LVM LV UUIDs. It's a bit out of the ordinary for
them to be GRUB roots through, usually the GRUB root is a plain
partition formatted as ext4 and mounted at /boot. That this is LVM
suggests /boot is a directory rather than a mount point, and the
system root mounted at /, is on an LVM LV. GRUB does support this.

Usually a 'grub2-mkconfig' will discover all of this and write out a
proper grub.cfg. So you shouldn't have to change it.

[Tom H]

On Wed, Jun 26, 2019 at 4:06 PM Patrick Dupre  wrote:
> How can I understand this:
> set root='lvmid/W6k0N8-5JlY-Xntk-w8Yi-Ss1F-I0IY-VzPRU3/vE133D-nAZ8-ltwF-2o4x-H6Cs-a9l5-19IRw4'

lvmid / W6k0N8-5JlY-Xntk-w8Yi-Ss1F-I0IY-VzPRU3 /
vE133D-nAZ8-ltwF-2o4x-H6Cs-a9l5-19IRw4

lvmid / VG UUID / LV UUID

[Patrick Dupre]

> On Wed, Jun 26, 2019 at 4:06 PM Patrick Dupre  wrote:
> > How can I understand this:
> > set root='lvmid/W6k0N8-5JlY-Xntk-w8Yi-Ss1F-I0IY-VzPRU3/vE133D-nAZ8-ltwF-2o4x-H6Cs-a9l5-19IRw4'
>
> lvmid / W6k0N8-5JlY-Xntk-w8Yi-Ss1F-I0IY-VzPRU3 /
> vE133D-nAZ8-ltwF-2o4x-H6Cs-a9l5-19IRw4
>
> lvmid / VG UUID / LV UUID

lvmid is not a command on my fedora machine!
How do I get the list of the lvmid?
It seems independent of blkid.
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[Tom H]

On Fri, Jun 28, 2019 at 6:30 PM Patrick Dupre  wrote:
> > On Wed, Jun 26, 2019 at 4:06 PM Patrick Dupre  wrote:
> > > How can I understand this:
> > > set root='lvmid/W6k0N8-5JlY-Xntk-w8Yi-Ss1F-I0IY-VzPRU3/vE133D-nAZ8-ltwF-2o4x-H6Cs-a9l5-19IRw4'
> >
> > lvmid / W6k0N8-5JlY-Xntk-w8Yi-Ss1F-I0IY-VzPRU3 /
> > vE133D-nAZ8-ltwF-2o4x-H6Cs-a9l5-19IRw4
> >
> > lvmid / VG UUID / LV UUID
>
> lvmid is not a command on my fedora machine!
> How do I get the list of the lvmid?
> It seems independent of blkid.

It's not a command. It's a grub way of defining an lvm volume,
"lvmid/vg_uuid/lv_uuid" when defining "/boot", in the same way that a
regular partition's defined by "fs_uuid".