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Re: [SOLVED] Re: Yet another UEFI/BIOS question

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Le 21-09-2018, à 20:21:06 +0200, Pascal Hambourg a écrit :

>Le 21/09/2018 à 08:34, steve a écrit :
>>Le 20-09-2018, à 20:25:26 +0200, Pascal Hambourg a écrit :
>>
>>>>>You don't need to convert anything. UEFI can use DOS partition tables.
>>>>
>>>>I know since that's what I'm currently doing.
>>>
>>>Doing what ?
>>
>>Using msdos partition tables.
>
>This is irrelevant because until now you were booting Debian in legacy 
>(BIOS) mode.

Absolutely correct.

>>>I am not talking about you doing anything. I am saying that native 
>>>UEFI boot (NOT legacy boot) can use a disk with a DOS partition 
>>>table, provided that it has an EFI system partition (Id 0xef).
>>
>>Isn't it ef00?
>
>No. ef00 is a gdisk specific mnemonic for the EFI system partition 
>type identifier in a GPT partition table. The actual GUID is 
>C12A7328-F81F-11D2-BA4B-00A0C93EC93B.
>(0x)ef is the partition type identifier for an EFI system partition in 
>a DOS partition table.

Thank you for the clarification.

>>Because what I finally did is install a fresh Debian on another device
>>(using GPT) and the ACPI errors still were there.
>
>In legacy mode (with a BIOS boot partition) or EFI mode (with an EFI 
>system partition) ?

In EFI mode. The "Bios" is now fully in EFI mode and it sees all my boot
disks.

>>I used the opportunity of having another Debian to convert my sda disk
>>to GPT tables, and change the BIOS setting to UEFI only (just for the
>>sake of it). So all my disk have a GPT partition table except for the 3
>>ones for the RAID1 array. Not sure whether I can use the same
>>manipulations to convert them to GPT also. But since they work fine, I
>>might leave it as it is.
>
>You can, but IMO it provides little value. GPT is useful in the 
>following cases :
>- disk bigger that 2 TiB

Might come sooner or later.

>- more that 4 partition without the extended/logical partition kludge
>- need to use PARTLABEL or PARTUUD (but RAID uses its own UUID)
>- system disk for Windows in EFI mode

I have but it's on it's own disk, so already in GPT.

>AFAICS none of these conditions apply to your RAID disks. However I 
>noticed that 2 out of the 3 RAID partition on each disk are logical 
>partitions. This is not necessary if there are only 3 partitions per 
>disk. So in order to get rid of the extended partition kludge, you 
>could either convert the logical partitions into primary partitions or 
>convert the partition table to GPT.

I think I'll do that so to have 100% GPT disks and leave the past where
it is and prepare the future. But this step worries me a bit because I
have all my personal data on one of the RAID1 and really don't want to
loose them. I think best would be to backup those data elsewhere in case
things go wrong.


Thanks a lot for all your very useful insights.

Have a nice week-end

Steve

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Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-19 17:00 +0200
  Re: Yet another UEFI/BIOS question Darac Marjal <mailinglist@darac.org.uk> - 2018-09-19 17:30 +0200
    Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-19 18:00 +0200
  Re: Yet another UEFI/BIOS question Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-19 23:40 +0200
    Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-20 09:00 +0200
      Re: Yet another UEFI/BIOS question Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-20 20:30 +0200
        [SOLVED] Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-21 08:40 +0200
          Re: [SOLVED] Re: Yet another UEFI/BIOS question Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-21 20:30 +0200
            Re: [SOLVED] Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-22 07:00 +0200
              Re: [SOLVED] Re: Yet another UEFI/BIOS question Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-22 10:10 +0200
                Re: [SOLVED] Re: Yet another UEFI/BIOS question steve <dlist@bluewin.ch> - 2018-09-22 10:50 +0200
            And yet another UEFI/BIOS question: Work on both. Wayne Sallee <Wayne@WayneSallee.com> - 2018-09-23 17:00 +0200
              Re: And yet another UEFI/BIOS question: Work on both. Patrick Bartek <nemommxiv@gmail.com> - 2018-09-23 18:20 +0200
                Re: And yet another UEFI/BIOS question: Work on both. Wayne Sallee <Wayne@WayneSallee.com> - 2018-09-23 23:30 +0200
                Re: And yet another UEFI/BIOS question: Work on both. Patrick Bartek <nemommxiv@gmail.com> - 2018-09-24 03:00 +0200
                Re: And yet another UEFI/BIOS question: Work on both. David Wright <deblis@lionunicorn.co.uk> - 2018-09-24 21:20 +0200
                Re: And yet another UEFI/BIOS question: Work on both. Michael Stone <mstone@debian.org> - 2018-09-24 21:30 +0200
                Re: And yet another UEFI/BIOS question: Work on both. Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-27 15:10 +0200
              Re: And yet another UEFI/BIOS question: Work on both. David Wright <deblis@lionunicorn.co.uk> - 2018-09-23 20:40 +0200

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