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

Tue May 29 15:20:04 UTC 2018
Robert Heller <heller at deepsoft.com>

At Tue, 29 May 2018 06:47:06 -0700 CentOS mailing list <centos at centos.org> wrote:

> On 05/29/2018 06:33 AM, Robert Heller wrote:
> >
> >> The UUID in the EFI boot options is 99E275E7-75A0-4B37-A2E6-C5385E600CB, which
> >> does not to match anything, but the system is only happy booting the old
> >> disk...
> > And at this point, it will only boot in legacy mode off the old disk.
> That's what I meant, I think.  Legacy mode is BIOS-compatible.  If 
> you're booting in legacy mode, you can't access the UEFI variables. The 
> old disk probably has GRUB installed on the first block.  It might be 
> booting in legacy mode *because* the UEFI boot option's UUID doesn't 
> match your partition.

OK,  I think at this point it is not wanting to even boot the old disk in EFI 
mode.  Maybe because the old disk is no longer in SATA port 0 (/dev/sda).  It 
is not wanting to boot the new disk in EFI mode and won't boot from the 
Optical disk in EFI mode (at least I cannot figure out how to do that).

> You might want to disable legacy mode entirely.  Boot a rescue disk if 
> needed, and fix the boot option from there.
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Robert Heller             -- 978-544-6933
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