Mirror on Same Host Controller vs. Diff. Host Controller

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Mirror on Same Host Controller vs. Diff. Host Controller

Post by shuman » Wed Dec 26, 2012 12:22 pm

Just in case anyone else was wondering. . .

I have 2 external Seagate 3TB, USB 3 drives connected to my mid 2011 mac mini. I assumed it would be faster to have each one connected to a different host controller (usb 2 on my mini). My assumption was correct. :) Here are the results.

Sharing the SAME controller:
Code: Select all
dd count=1k bs=1m if=/dev/zero of=test.img

14.86 MB/s

Code: Select all
dd count=1k bs=4m if=/dev/zero of=test.img

14.37 MB/s


Connected to DIFFERENT controller:
Code: Select all
dd count=1k bs=1m if=/dev/zero of=test.img

20.57 MB/s

Code: Select all
dd count=1k bs=4m if=/dev/zero of=test.img

18.75 MB/s


In the end the only thing that surprises me is that there isn't a bigger difference between the results. Although, 25% increase is respectable.
- Mac Mini (Late 2012), 10.8.5, 16GB memory, pool - 2 Mirrored 3TB USB 3.0 External Drives
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