raid1 sector size

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hi guys, there's a way to increase sector size?
instead of 512bytes use 4096bytes?

check:
md0: 512bytes
sda: 4096bytes
sdb: 4096bytes

i want a 512bytes at md0
why? i'm trying to reduce IOPS (more bytes to read = less io / second)
and maybe increase read rate

-- 
Roberto Spadim
Spadim Technology / SPAEmpresarial
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