doubt about raid1 and writemostly

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hi guys, i'm with a doubt
when i use witemostly, how the md handle the slower drive
(writemostly) for example i have 2 ssd that support 500mb/s write
running raid1, i included a hdd with +- 100mb/s write with writemostly
flag
when i execute a dd if=/dev/zero of=./test , i get near to 200mb/s
with dd, and using iostat -d 1 -k, i get +- 100mb/s
there's some kind of configuration to writemostly drive? something
like 'buffer size' or someting like it?

-- 
Roberto Spadim
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