[GLLUG] Installing GRUB on PReP LV

[James Dutton]

On Thu, 26 Jan 2023 at 16:26, Henrik Morsing via GLLUG <
gllug at mailman.lug.org.uk> wrote:

>
> Good afternoon,
>
> I am working on a disk migration project migrating amongst others, SUSE
> and RHEL LPARs to new storage.
>
> It was a bit of a faff getting the procedure right for the SUSE systems,
> which is the vast majority, but it works. But trying to migrate the few
> RHEL systems, when it comes to installing GRUB, I get this:
>
> [root at dl2039 ~]# grub2-install /dev/mapper/mpathe-part1
> Installing for powerpc-ieee1275 platform.
> grub2-install: error: cannot find a GRUB drive for
> /dev/mapper/mpathe-part1.  Check your device.map.
>
> RedHat "support" is no help what so ever and just mumble something about
> moving /boot is not supported.
>
> Does anyone have any idea what this device.map is?
>
>
You don't make it particularly clear what sort of new storage you are using.
Is the new storage visible from the machine at boot time?
If it is, then you will need to edit or create a new "device.map" file, so
grub knows what to do.
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