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From: Jesper <Vitsky.kasperski@gmail.com>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: Move bookworm system from SSD to NVME
Date: Thu, 1 Aug 2024 17:47:32 +0200
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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.



> 
> 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

> /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:-)

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