Re: Move bookworm system from SSD to NVME

On 16.08.2024 15:17, The Natural Philosopher wrote:

On 16/08/2024 13:46, Ahem A Rivet's Shot wrote:

On Fri, 16 Aug 2024 11:04:26 +0200
Jesper <Vitsky.kasperski@gmail.com> wrote:
>

raspberrypi@raspberrypi:~ $ sudo dd if=/dev/sda of=/nvme0n1 bs=1b
dd: error writing '/nvme0n1': No space left on device

>
    Your command is missing a /dev it should be:
>
sudo dd if=/dev/sda of=/dev/nvme0n1 bs=1b

 No. Again 2 things wroing.
 /dev/nvme0 is the RAW device.

No, it did not like the 'nvmeO'. Here is what it said:
raspberrypi@raspberrypi:~ $ sudo dd if=/dev/sda of=/dev/nvme0
dd: skriver til '/dev/nvme0': Ugyldig argument
1+0 records in
0+0 records out
0 bytes copied, 0,000298314 s, 0,0 kB/s
'Ugyldig argument' is norwegian for 'illegal argument.
But I managed at last to make the copy like this:
raspberrypi@raspberrypi:~ $ sudo dd if=/dev/sda of=/dev/nvme0n1
500118192+0 records in
500118192+0 records out
256060514304 bytes (256 GB, 238 GiB) copied, 2157,41 s, 119 MB/s
raspberrypi@raspberrypi:~ $
After that I shut down the raspi, removed SD-card and SSD. Applied power, and it booted from the nvme, and I am running on that while writing this.
Thanks for all patient help from you all :-)
Best regards

bs=1M is correct  for decent transfer rate
 

>
    The "no space on device" error comes because without the /dev dd is
attempting to write a file called nvme0n1 in / but since / runs out of
space before it finishes the file is never closed and thus no directory
entry is written which is why yuou never see it.
>
    Also I don't think bs=1b is likely to be a good blocksize (1
byte). If the version of dd you're using doesn't support bs=1m then try
bs=1024k or be=1048576. The idea is to get it to use the largest block size
(and thus writes) that the data path will support.
>

bs=1M is sensible.
   1Mib.
 

--
Jesper