So, section 1.4 of http://tldp.org/HOWTO/Software-RAID-HOWTO-1.html has
the beginning of an answer: instead of optimizing performance for a
single reader (hdparm -t), performance is optimized for multiple
concurrent readers (two processes accessing different data).
I tried running two "dd" on two parts of the same RAID 1 array (with
iflag=direct and and skip=<block> for the second dd) and got about 69.5
MB/s peek cumulated performance according to "killall -USR1 dd", while
the drives are 42.5 and 49 MB/s capable (according to hdparm -t).
** Changed in: mdadm (Ubuntu)
Status: New => Invalid
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raid1 with sata is slow (speed of a single disc)
https://bugs.launchpad.net/bugs/120378
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