[CentOS] CentOS6: HELP! EFI boot fails after replacing disks...

Tue May 29 14:03:07 UTC 2018
Stephen John Smoogen <smooge at gmail.com>

On 28 May 2018 at 18:25, Robert Heller <heller at deepsoft.com> wrote:

> Then I shut the machine down, swapped in the new backup [2TB] disk and pulled
> the old system [500G] disk and installed the third new [2TB] disk. The system
> won't boot that way. It seems there is something in the UEFI (secure boot)
> logic that wants the original disk, even if everything is moved over.

This caught my attention. Did you mean that you are using the secure
boot options? I don't know if that ties down a system to a specific
disk until it is cleared from the install. From all the other items
you listed in the the thread, your system looks like it is booting
into a form where it is saying it isn't UEFI anymore which would be a
boot firmware option. The firmware can lock down what it thinks is ok
to boot from and may require some sort of flush depending on the type
of disks it thinks are ok. I had this with one set of systems where
the system required a hard flush of UEFI buffers before it would boot
from a larger disk. It was ok with the same old model but a new one
was not possible.

My debugging methodology at this point would be the following:

1. Boot from EL6 iso and see if EFI variables/modules work
2. Boot from EL7 iso and see if EFI variables/modules work
3. See if a Dell firmware update set is available and if the
changelogs say it fixes EFI boot issues
4. repeat 1&2 if a firmware update is done.

>From what I can tell, most of the install methods and 0 downtime
'hacks' we have used for the last 30 years on BIOS systems are either
impossible or need serious fixes to work again in a UEFI world.

Stephen J Smoogen.