This x 100.
A sub 1L "mini, tiny, micro" pc (mini = HP naming, tiny = Lenovo, micro = Dell) are much much better options than a RPI.
Remember these desktops are "business class" desktops that include all the BIOS bells and whistles. Secure boot, backup BIOS images, Block USB drives, etc.
You can routinely find something like an HP Micro 800 G3 for sub-$125. There is no reason to buy a weak, underpowered, hard-to-manage RPI for these use cases.
This x 1000.
By far best choice! Don't waste time with single board computers. Even a used laptop works.
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used laptops are ideal because if you have a power event the built-in battery allows for a graceful shutdown
otherwise a power event can corrupt your channel state
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Yep another great option.
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Second this. I've run many RPI and they are cool. I've used them for nodes. No way I would buy one for that purpose now. The mini PCs are better in every way.
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