On 22 April 2013 18:07, Martin N <marti...@bluebottle.com> wrote: > Hello, > > At 17:08 22/04/2013, you wrote: > >> On 2013-04-22 13:00, >> <mailto:hampshire-request@**mailman.lug.org.uk<hampshire-requ...@mailman.lug.org.uk> >> >hampshire-**requ...@mailman.lug.org.uk<hampshire-requ...@mailman.lug.org.uk>wrote: >> >> >> On 21 April 2013 17:34, Peter B. <<mailto:pet...@gmail.com>pety** >> r...@gmail.com <pet...@gmail.com>> wrote: >> >> As far as I know usb 2.0 maxes out at 30mbps usb 3.0 100mbps for local >> data transfer. >> >> I think you're confusing things here. USB2 runs at up to 480Mbps raw line >> speed, and USB3 runs at up to 5Gbps. >> >> >> -- >> Daniel Llewellyn >> >> That's as maybe. However USB relies upon a whole heap of CPU Processing >> to move anything. This is done do keep the costs down. Firewire on the >> otherhand does DMA and uses a whole lot less CPU. >> As someone who wrote their first Device Driver before Microsoft existed >> (for a PDP-11/45 in 1976) Serial I/O using devices such as a UART is >> really-sllooowwww. DMA is much faster and neater. Sadly in these X86 times >> there are lots of devices that do I/O character by character or >> byte-by-byte and not using DMA. >> > > > Is this the same for e-SATA? > (high CPU load) > > That will probably the way i will go when i can find a 4 bay dock for a > reasonable price.
I wholeheartedly agree that standard ethernet based disks (gig-e) are the way to go if you require multiple hosts accessing either simultaneously or with a minimum of (un)plugging. However, I would suggest looking into e-sata if you only need to connect one host. AFAICT e-sata is just a socket/plug standard and some rules over hot plugging which expose the internal sata bus directly with no additional encapsulation (unlike USB disks) - i.e. e-sata should be capable of being just as performant as internal sata. -- Daniel Llewellyn
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