On Fri, Jan 15, 2010 at 05:03:03AM +0100, sascha wrote:
> > USB is widely available, but still a serial bus, so only a single
> > request to a single memory stick per host controller is in flight at
> > any one time. (Even with 8 USB ports it's still one controller.)
>
> tests show otherwise:
> single usb stick:
> Results: 967 seeks/second, 1.03 ms random access time
>
> 3 usb sticks on a hub accessed concurrently:
> Results: 907 seeks/second, 1.10 ms random access time
> Results: 916 seeks/second, 1.09 ms random access time
> Results: 915 seeks/second, 1.09 ms random access time
>
a ran a test on my 16 usb-stick linear raid, with 4 sticks per hub,
4 hubs, 1 on the first usb port of my computer, 3 on another hub connected
to the second usb port of the computer. i can do 16000 seeks per second
and transfer 512 bytes on each seek, giving 62.5 usec combined access time
for the raid. it also blinks like a christmas tree ;)
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