Reads from write-mostly HDD instead from _non_ write-mostly SDD as expected?

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Hi!
I am trying to use two --write-mostly HDDs (sda5 & sdd5) and single SDD (sdc1) 
as RAID0 for my database partition.

# cat /proc/mdstat                                                                                                                                                                                                                                        
Personalities : [raid10] [raid1] 
md9 : active raid1 sdc1[0] sda5[3](W) sdd5[4](W)
      117152576 blocks super 1.2 [3/3] [UUU]
      bitmap: 1/1 pages [4KB], 65536KB chunk

but seems as reads are directed to wrong drive (sdd):

Device: rrqm/s    r/s  rMB/s  avgrq-sz r_await  svctm   %util
sdc     0.00     0.00   0.00     35.24    0.00   0.82   11.50
sda     0.07     1.10   0.01     32.57   31.39   1.92   30.32
sdd     0.37   268.23   3.18     28.05   13.95   2.43  100.45
md9     0.00   268.57   3.18     24.89    0.00   0.00    0.00


How can I fix it?

At beginning it worked as expected (all reads from sdc),  later I did few --
add/--replace  --write-mostly operations and it broke.

TIA, regards,

Linux 3.14.7-1 #1 SMP Thu Jun 12 14:32:56 CEST 2014 x86_64 
mdadm - v3.3.1 - 5th June 2014


-- 
Mateusz Korniak
"(...) mam brata - poważny, domator, liczykrupa, hipokryta, pobożniś,
 	krótko mówiąc - podpora społeczeństwa."
				Nikos Kazantzakis - "Grek Zorba"

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