I would like to know if it would be possible on linux, using a host-to-host cable, for one machine to act as a storage device for another machine. In other words, to have one machine pretend to be a USB hard drive or CD-ROM drive by 'exporting' a directory / partition / group of files.
Those host-to-host "cables" are already USB devices, ones that don't talk storage protocols. If that's your hardware, then try using NFS over usbnet.
However, some Linux systems will be used to implement usb devices; iPaqs and Zaurii for example, also some systems that use PCI. Those would support different choices. So in addition to NFS, you could also run drivers like this new one:
http://marc.theaimsgroup.com/?l=linux-usb-devel&m=107473014817740&w=2
http://lists.debian.org/debian-boot/2004/debian-boot-200401/msg02295.html
Here you asked an additional problem about booting over USB. Host side Linux doesn't yet boot from usb devices; maybe some hub driver fixes could eventually resolve that.
- Dave
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