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SubjectRe: kernel cmdline: root=/dev/sdb1,/dev/sda1 "fallback"?

> The device is pretty small and has no keyboard, video card etc., so if it ever
> happens to break (can be a disk failure, but also operator who messed with
> startup scripts), it has to be opened (warranty!).
> These all unpleasant tasks could be avoided if it was possible to have a
> "fallback" device. For example, consider this hypothetical command line:
> root=/dev/sdb1,/dev/sda1

You should use initramfs to achieve that.

(Note that SD naming is anyway dynamic - if only one of USB or HDD
is plugged in, it will most likely become sda.)

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