Subj : Re: Move bookworm system from SSD to NVME
To   : Jesper
From : The Natural Philosopher
Date : Thu Aug 01 2024 17:52:02

On 01/08/2024 16:47, Jesper wrote:
> On 01.08.2024 13:55, The Natural Philosopher wrote:
>> On 01/08/2024 12:31, Jesper wrote:
>>> Then the system to copy is on the 2 last lines. Correct?
>>>
>> No.
>>
>> In order to preserve the partition information *you must dd the raw disk*
>>
>> dd id=/dev/sda od = /dev/nvme0n1 (or whatever)
>>
>> That will create a two partition disk with the UUIDS of the partitions
>> the same as is mentioned in the boot data: If they don't match it wont
>  >boot.
>
> Are you saying that this command (the one right above) will clone the
> whole disc, and the job is done? Probably not. When I run "dd --help" on
> the system i want to clone, there is no information about the switch
> "id" you use in the command.
>
>
Soory. old brain.
dd if=/dev/sda  of = /dev/nvme0n1 (or whatever)

>>
>> Viz:
>>
>>
>> df -h | grep ^/dev/
> Running that command on my system gives:
> raspberrypi@raspberrypi:~ $ df -h | grep ^/dev/
> /dev/sda2           234G   19G   203G    9% /
> /dev/sda1           511M   76M   436M   15% /boot/firmware
> For /dev/sda1 it says "firmware", so it probably should/can not be
> copied, and is permanent on the raspi5-system

It has to be copied because it contains the boot information


>
>> /dev/root        15G  1.5G   13G  11% /
>> /dev/mmcblk0p1  255M   51M  205M  20% /boot
>>
>> These are the TWO partitions on a bootable PI device
>> In /boot which is DOS style formatted will be instructions on how to
>> boot the main system
>>
>> In the main bootable system there will be the fstab file which needs
>> to tally with the partition ids.
>>
>> more /etc/fstab:
>>
>> proc            /proc           proc    defaults          0       0
>> PARTUUID=b8c9fbb7-01  /boot           vfat    defaults          0       2
>> PARTUUID=b8c9fbb7-02  /               ext4    defaults,noatime  0       1
>>
>> In the BOOT partition is this file
>>   more *.txt
>> ::::::::::::::
>> cmdline.txt
>> ::::::::::::::
>> console=serial0,115200 console=tty1 root=PARTUUID=b8c9fbb7-02
>> rootfstype=ext4 fs
>> ck.repair=yes rootwait modules-load=dwc2,g_ether
>>
>> Unless the bootloader finds that partition ID, it will *not load Linux*
>>
>> AIUI the boot sequence is this:
>>
>> Look for a DOS style VFAT partition on SD card, then USB, then NVME.
>>
>> Look for a file named 'cmdline.txt' parse the root partition ID  and
>> attempt to load a linux image from the boot  partition and have the
>> kernel image mount the aforementioned PARTUUID as root partition.
>>
>> If the PARTUUIDs don't match, the boot sequence hangs
>>
>> So it is important to have the same PARTUUID in /boot/cmdline.txt, and
>> in /etc/fstab, and in the partition label on the boot partition
>>
>> The easy way to do this is not to clone the partitions, but the RAW DISK
>>
>>
>>> And following drucks first suggestion I should run these 2 commands:
>>> 1: dd if=/dev/sda2 of=/dev/nvme0n1 bs=1M status=progress
>>> and
>>> 2: dd if=/dev/sda1 of=/dev/nvme0n1 bs=1M status=progress
>>>
>>> replacing the name of the NVME to what I see when it is installed on
>>> the raspi.
>>>
>>> Best regards, and thank you for the help.
>>
>> That wont work, but you wont destroy anything by trying
>
> So I will not try :-)
>
> I think I should not take any more of your time for this project. Using
> a PC and a windows program (Macrium Reflect) to clone the disc will take
> maybe 30 minutes. Learning the ins and outs of how it should be done in
> raspi-os can take 14 days for a windows-addict:-)
>

dd  will clone it in a lot less time

And that is the point, You MUST clone the WHOLE DISK. Not the partitions
inside it

> Best regards, and thank you for the help so far.

--
In todays liberal progressive conflict-free education system, everyone
gets full Marx.

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