Does enabling RasPi Overlay FS cause problems in SBC mode?

[Nagoya-Kougei]

Currently, I am building a 3D printer system using the Duet3 Mini5+.

To prevent potential damage to the Raspberry Pi's SD card due to the loss of AC power to the 3D printer, I am considering implementing a read-only mode using the Raspberry Pi's Overlay File System.

If I enable the Raspberry Pi's Overlay FS, I understand that the following will occur:

・G-code and other files will not be saved to the main SD Card 0.
・Modifying .g files or using commands like M500 will result in them being reset when the power is turned off.

Are there any potential issues or problems that may arise with DWC or any other aspects besides the ones mentioned above? For example, could DWC's performance become unstable?

If I want to ensure stable operation of the Raspberry Pi, would it be advisable to increase the memory (RAM) size?

As I intend to provide the printer as a product, I actually consider it safe for firmware configuration files and settings to revert to the factory state when the power is turned off.

[chrishamm]

@Nagoya-Kougei That is correct. G-code and other SD files (comparable to standalone mode) are saved in /opt/dsf/sd. You can adjust this path in /opt/dsf/conf/config.json -> BaseDirectory AFAIR in case you want to move it to /boot or somewhere else.

I consider ext4 to be robust enough to deal with sudden power losses, so I am not worried about FS corruption on my machines. In contrast to ext2/3 on older HDDs I've never encountered FS problems with ext4.