On Sat, Nov 7, 2015 at 8:21 AM, Ken Schneider - openSUSE
On 11/06/2015 03:43 PM, Greg Freemyer wrote:
On Thu, Nov 5, 2015 at 2:16 PM, Greg Freemyer
wrote: On Mon, Nov 2, 2015 at 4:25 PM, Greg Freemyer
wrote: On Sat, Oct 17, 2015 at 11:06 PM, Greg Freemyer
wrote: On Wed, Oct 14, 2015 at 7:08 PM, Carlos E. R.
wrote: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256
On 2015-10-14 22:24, Greg Freemyer wrote:
> I saw no speed change after I quit moving the mouse. I don't know > where the bottleneck is that keeps the transfer from running > faster. Probably in the USB-3 bus itself.
Or the SSD itself. There is a limit to sustained write speed.
You must be right.
I've got quite a bit of data to move around overnight so I thought I start up 2 simultaneous big transfers at the same time.
I've got 2 SSDs sending data to / from rotating media. I'm seeing 350 MB/sec aggregate traffic on the USB-3 bus.
That's 3.5 Gbits/sec. That's the fastest I've ever noticed data going across that bus.
fyi: I just bought a new Anker USB-hub (7-port this time), so it could be that this hub is faster than the one I was using a couple days ago.
Greg
This thread triggered me to go get a USB-3.1 card. (I actually bought the ASUS X99-Deluxe Motherboard with an included USB-3.1 card. This will be my new "lab" machine.) I have an internal SSD on the sata cable.
I'm doing my first test copy of 80GB from a USB connected SSD to a SATA connected SSD. The USB connected SSD is connected to one of the USB-3.1 ports.
I am getting 330 MB/sec transfers (roughly 20GB/min). Note that external USB device was still a SATA<-->USB-3 adapter with a SSD in it, so 5 Gbit/sec is the theoretical max speed of that adapter, so I'm seeing a little over 60% of theoretical max speed in this setup doing a pure sequential read.
Next I need to get a USB 3.1 sata dock. I just ordered one of these:
http://www.amazon.com/gp/product/B0116I8DWG
It will be interesting to see what kind of speeds I get out of that.
Greg
I have the new USB 3.1 dock. It is the same speed as my old USB 3.0 dock. I haven't tried any multi-transfer activity, so in that mode USB 3.1 may be faster, but for a simple point-to-point copy, it is not worth buying.
Greg
Not only is that Unitek USB 3.1 dock not fast, it is not reliable. In the last 24 hours I had it disconnect from my computer twice. As I said before, I'm a heavy USB-3 user and disconnects like that are something I both notice and find unacceptable.
I'm returning it to Amazon.
Greg
You might want to takea look at this. Not as pretty but...
That's still USB-3. I'm getting about 70% of max theoretical for USB-3 (5 Gbit/sec). I was looking for a bump up by going to USB 3.1 (10 Gbit/sec theoretical). Greg -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org