Re: How do I clone a Debian Distro from a 32Gb Class 10 MicroSD card to a 16Gb Class 10 A1 MicroSD card?

Hello David. As requested . . . .

2021-09-27 13:49:50 root@loki ~
# cat /etc/debian_version ; uname -a
bullseye/sid
Linux loki 5.10.60-sunxi #21.08.2 SMP Tue Sep 14 16:28:44 UTC 2021 armv7l armv7l armv7l GNU/Linux

2021-09-27 13:50:06 root@loki ~
# egrep 'vendor_id|model name' /proc/cpuinfo | head -n 2
model name : ARMv7 Processor rev 4 (v7l)
model name : ARMv7 Processor rev 4 (v7l)

2021-09-27 13:50:53 root@loki ~
# fdisk -l
Disk /dev/ram0: 4 MiB, 4194304 bytes, 8192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/ram1: 4 MiB, 4194304 bytes, 8192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/ram2: 4 MiB, 4194304 bytes, 8192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/ram3: 4 MiB, 4194304 bytes, 8192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/mmcblk0: 29.74 GiB, 31914983424 bytes, 62333952 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xe069b87e

Device Boot Start End Sectors Size Id Type
/dev/mmcblk0p1 8192 61702143 61693952 29.4G 83 Linux

Disk /dev/zram0: 483.64 MiB, 507117568 bytes, 123808 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

Disk /dev/zram1: 50 MiB, 52428800 bytes, 12800 sectors
Units: sectors of 1 * 4096 = 4096 bytes
Sector size (logical/physical): 4096 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes

On Sat, 18 Sept 2021 at 20:20, David Christensen <dpchrist@holgerdanske.com> wrote:

On 9/18/21 4:35 AM, Myron wrote:
> Never done this one with Linux before. I know that there is less than 16Gb
> of data written to the Class 10 32Gb MicroSD card which is used as the
> primary system storage on a single board system-on-a-chip computer. What
> I'm after is getting a 16 Gb Class 10 A1 MicroSD card and clone the entire
> system from the 32Gb card to the 16Gb card.
>
> What I'm after is when I start the SOC computer from the replacement 16Gv
> Class 10 A1 MicroSD card, it will just start like there have been no
> changes, well, apart from there being 16Gb storage and not slower 32Gb
> storage.
>
> This is relatively easy to do on Windows. No clue how to do this with
> Linux.
>

Backup your data. I would take a raw binary image of the entire 32 GB
MicroSD card as well.

My guess is that you should resize the contents of the 32 GB MicroSD
card to fit onto the 16 GB MicroSD card, and then clone.

But, the devil is in the details and it would be helpful if we had more
information...

What is the make and model of your "single board system-on-a-chip
computer" (SBC)? What CPU, memory, or other options does it have? What
is the technical support URL?

Is the SBC connected to a keyboard, mouse, and monitor, to a serial
console, or to some other console? Can you SSH into it?

How did you create a working Debian (?) GNU/Linux instance on the 32 GB
MicroSD card? If you followed some instructions, what is the URL?

On the 32 GB MicroSD card Debian instance, please login as root, run the
following commands, and reply with the complete console session --
prompts, commands entered, output obtained:

# /bin/bash -l

# export PS1='\n\D{%Y-%m-%d %H:%M:%S} \u@\h \w\n\$ '

# cat /etc/debian_version ; uname -a

# egrep 'vendor_id|model name' /proc/cpuinfo | head -n 2

# grep MemTotal /proc/meminfo

# fdisk -l

David