How to boot from SD but run from USB?

Hello Chris!

23 Jan 25 22:12, you wrote to all:

Maybe this is useful

https://aroundmyroom.com/2018/07/28/update-boot-from-usb-with-hp-microserver-
gen8-and-openmediavault/

and gives you hints

I own some HP Gen8 Microservers where you cannot boot (depends on how you want
to use the HDD's) from the ODD port, but you can use it to have a disk
connected to it for further use

So the trick is to boot from your SD and than tell Grub that it has to use that
device for the rest
so the USB disk (in my instance) was only getting start and than go further to
the SATA

But it should not matter if that is SD or USB whatever..

If you start chatgpt.com  ..
and ask a question like

how to start from an SD card (initial boot) on a raspberry pi and than the rest
through grub starting to the USB ?

you get also an answer you might be able to use


 CG> I'm sure this is basically easy but I can't find a simple description
 CG> of how to do it.  If you search for anything about 'boot' and 'USB'
 CG> you are immediately flooded with descriptions of how to boot from USB
 CG> and that's not what I want.

 CG> I have an ancient Pi B+ that does all I need where it is but I'd like
 CG> to be less reliant on the SD card.  You can't (easily) boot such an
 CG> old Pi from USB and I don't really need to, I just want to make it so
 CG> that once booted all activity is on a USB drive.

 CG> Is it simply a matter of leaving /boot on the SD card and changing /
 CG> to being a USB drive or does one need to edit something in /boot
 CG> somewhere?


Dennis


... The network runs on duct tape and dreams.