Re: CentOS6: HELP! EFI boot fails after replacing disks...

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At Mon, 28 May 2018 20:49:54 -0700 CentOS mailing list <centos@xxxxxxxxxx> wrote:

> 
> On 05/28/2018 06:20 PM, Robert Heller wrote:
> > The UUID in the BIOS is NOT VFAT volume.  It is something completely
> > different.  I have no clue what it is -- it does not correspond to anything I
> > can find.
> 
> 
> It should be the UUID of the partition, not of the VFAT volume. The 
> partition UUID is stored in the GPT.  The volume UUID is stored in the 
> filesystem header (I believe).
> 
> For example, on my laptop:
> 
> # efibootmgr -v | grep Fedora
> Boot0000* Fedora 
> PciRoot(0x0)/Pci(0x17,0x0)/Sata(2,65535,0)/HD(1,GPT,39484dd8-b1d9-47b2-b4d7-89dfe3ce5e09,0x800,0x12c000)/File(\EFI\fedora\shimx64.efi)
> 
> # blkid | grep sda1
> /dev/sda1: LABEL="ESP" UUID="3850-574E" TYPE="vfat" PARTLABEL="EFI 
> System Partition" PARTUUID="39484dd8-b1d9-47b2-b4d7-89dfe3ce5e09"
> 
> # sgdisk -i1 /dev/sda
> Partition GUID code: C12A7328-F81F-11D2-BA4B-00A0C93EC93B (EFI System)
> Partition unique GUID: 39484DD8-B1D9-47B2-B4D7-89DFE3CE5E09
> First sector: 2048 (at 1024.0 KiB)
> Last sector: 1230847 (at 601.0 MiB)
> Partition size: 1228800 sectors (600.0 MiB)
> Attribute flags: 0000000000000000
> Partition name: 'EFI System Partition'

Well, on my system:

newserver.wendellfreelibrary.org% sudo blkid /dev/sda1
/dev/sda1: SEC_TYPE="msdos" UUID="8D81-8D0C" TYPE="vfat" 
newserver.wendellfreelibrary.org% sudo blkid /dev/sdb1
/dev/sdb1: SEC_TYPE="msdos" UUID="8D81-8D0C" TYPE="vfat" 

That UUID is the VFAT partition (I dd'ed the partition from the old disk 
(/dev/sdb1) to the new disk (/dev/sda1)

And:

newserver.wendellfreelibrary.org% sudo sgdisk -i1 /dev/sda
Partition GUID code: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 (Microsoft basic data)
Partition unique GUID: BD7AFF34-3303-4D58-92C2-0BB938D467CB
First sector: 2048 (at 1024.0 KiB)
Last sector: 497663 (at 243.0 MiB)
Partition size: 495616 sectors (242.0 MiB)
Attribute flags: 0000000000000000
Partition name: 'primary'

newserver.wendellfreelibrary.org% sudo sgdisk -i1 /dev/sdb
Partition GUID code: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7 (Microsoft basic data)
Partition unique GUID: 7B6AD1F7-DA76-40F0-94C8-6196CCDD47E5
First sector: 2048 (at 1024.0 KiB)
Last sector: 497663 (at 243.0 MiB)
Partition size: 495616 sectors (242.0 MiB)
Attribute flags: 0000000000000000
Partition name: 'primary'

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...


> 
> 
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>                                                                                          

-- 
Robert Heller             -- 978-544-6933
Deepwoods Software        -- Custom Software Services
http://www.deepsoft.com/  -- Linux Administration Services
heller@xxxxxxxxxxxx       -- Webhosting Services
                                                                                              
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