On 07/03/2014 05:46 PM, Greg Freemyer wrote:
One receiving disk maxes out at 108 Two receiving disks: Second drive takes advantage of first being maxed (not ready to receive) and it (#2) receives while #1 is busy. They take turns Agreed. but why don't I get better USB-3 bus utilization. A single drive does gets about 20% bus utilization. Why don't I get 40% with 2 drives?
By the time you have 5 targets, you've probably maxed out your sending disk and the wire is waiting for data. I'm not sure what you are saying. With "dc3dd wipe=/dev/sdb" all of the zeros come straight from the CPU. It can generate way more than 200MB/sec of zeros. The bottleneck is not the data source. It has to be the USB-3 bus.
Then the logical test is attach some kind of null sink to the hub, something that acts like /dev/null, and see how fast to can write to it without worrying about cache and device bandwidth. -- /"\ \ / ASCII Ribbon Campaign X Against HTML Mail / \ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org