Hi,
I am just figuring out the performance issues - thanks guys for this bug 
description!
It looks like the problem remains unsolved:
$iostat -cd
Linux 4.4.0-63-generic (ruprecht)       21.2.2017       _x86_64_        (8 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           1,52    0,01    0,41   13,03    0,00   85,04

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sda             142,33      1832,54       541,55    2174234     642525
sdb              18,86         0,08       541,55         92     642525
...
dm-0            158,76      1832,46       541,55    2174142     642525

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https://bugs.launchpad.net/bugs/361733

Title:
  dmraid(fakeRAID) raid1 driver doesn't loadbalance reads

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