[kwlug-disc] USB 2.0 vs. 3.0 on Linux

[Khalid Baheyeldin]

On Mon, Sep 22, 2014 at 7:59 PM, William Park <opengeometry at yahoo.ca> wrote:

> - What kind of test?
>

Copying around 100GB worth of files, most of them multi-gigabyte in size,
from one disk to the other. Using rsync, while the files do not exist on
the target

rsync -av /mnt/disk1/ /mnt/disk2


> - Sequential, random?
>

Sequential.


> - DC or USB powered?
>

USB powered. Both disks are portable (one Toshiba Canvio, the other Seagate
Expansion.


> - Intel, AMD? -- Intel 3Gbps chipset is better than AMD 6Gbps.


This is an AMD machine.


> You see the difference under heavy load, like 4 VMs in

Hyper-V as I'm doing now.
>

Bare metal in my case, no virtualization, and no other load on the machine.

Seems there is a partial answer here:

http://www.macworld.com/article/2039427/how-fast-is-usb-3-0-really-.html

Spinning disks can only do 114MB/s (7200 RPM that is). SSDs can do 200 MB/s.

-- 
Khalid M. Baheyeldin
2bits.com, Inc.
Fast Reliable Drupal
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wrong." -- H.L. Mencken
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