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Topic starter
Hi,
I have been testing out RAID with SoftRAID on my Macbook Air and am finding that when I connect the RAID 0 drives directly to the USB 3.0 ports I get like 480MB/s but when sticking the disks into a drive bay I am only getting the standard speed of 220MB/s, the drive bay is a USB 3.0 and looking at the System properties and also within SoftRAID it shows the disks being on a USB 3 bus.
Could anyone explain what is happening here? I would much rather the 480MB/s as it is for processing media conversions and the like.
Posted : 15/03/2016 3:11 am
What is the "drive bay"? Is it a USB hub? If we know what you are referring to, we may be able to help you figure this out.
Posted : 15/03/2016 11:18 am
Topic starter
What is the "drive bay"? Is it a USB hub? If we know what you are referring to, we may be able to help you figure this out.
Hi, yes sorry, I have a drive dock/bay which is USB 3.0 and it holds up to 4 drives in the one unit. http://www.hotway.com.tw/portfolio/portfolio-3-column/hfd1-su3s2/
Currently I have two 128GB SSD's in it which are RAID 0, when testing the speed with Black Magic in the drive dock/bay I get a speed of around 220 but when putting the disks in a proper enclosure and plug them into individual USB ports I get around the 480 mark.
Posted : 15/03/2016 3:28 pm
I don't know what is wrong. This may be as fast as the dock can send IO. Since it is a single USB connector, that probably limits throughput. (both have to go through one bus)
Consider a Thunderbay enclosure instead.
I also see this, but do not know what they mean in their specs:
Specs:
Mac OS X 10.8 or later ( Only for USB 2.0)
Posted : 15/03/2016 3:37 pm
Topic starter
Ok, thanks. I think it may be something to do with it running off the one USB 3.0 bus and the capacity of the link yes. So when it is actually plugged into individual USB ports it has individual controllers for each disk. Shame I only have 2 USB ports in the Air.
Posted : 15/03/2016 11:24 pm
