> I was wondering whether or not it'd be feasible to hook up something
> like http://tinyurl.com/jgov5gc (Amazon.com) to something small like a
> Raspberry Pi 3, or if the I/O would be too much for that kind of
> computer to handle.
Probably feasible but it is likely to be slow, because Plan 9's usb
implementation is not particularly efficient, and the pi's usb host
adapter hardware is especially bad. Someone with a usb disk might
be able to quote actual bandwidth numbers.
I have a Seagate 1TB usb drive (SSD), which does not work at all with
Plan 9. Haven't looked into it deeply, but it appears usb/disk isn't
parsing the usb interface descriptors correctly.
ep7.0 storage csp 0x500608 csp 0x620608 vid 0x0bc2 did 0x231a Seagate
Expansion dwcotg
There are two interfaces, and instead of selecting the correct one
(0x500608) usb/disk seems to be mixing up the endpoints from both
interfaces together:
Seagate Expansion NA82688P
conf: cval 1 attrib 80 500 mA
iface csp storage.6.98
alt 0 attr 2 ival 0
alt 1 attr 2 ival 0
ep id 1 addr 1 dir inout type bulk itype 0 maxpkt 512 ntds 1
ep id 2 addr 130 dir inout type bulk itype 0 maxpkt 512 ntds 1
ep id 1 addr 1 dir inout type bulk itype 0 maxpkt 512 ntds 1
ep id 2 addr 130 dir inout type bulk itype 0 maxpkt 512 ntds 1
ep id 3 addr 131 dir in type bulk itype 0 maxpkt 512 ntds 1
ep id 4 addr 4 dir out type bulk itype 0 maxpkt 512 ntds 1
dev desc 24[4]: 04 24 01 00
dev desc 24[4]: 04 24 02 00
dev desc 24[4]: 04 24 03 00
dev desc 24[4]: 04 24 04 00
My file server is built from an intel atom mini-itx board with a SATA
disk. Sequential read speed is over 100 MB/sec, more than enough to
saturate my network. By comparison, I get less than 10 MB/sec reading
from a usb flash drive on the same machine.
