raid5 write performance

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Neil hello.

I have been looking at the raid5 code trying to understand why writes
performance is so poor.
If I am not mistaken here, It seems that you issue a write in size of
one page an no more no matter what buffer size I am using .

1. Is this page is directed only to parity disk ?
2. How can i increase the write throughout ?


Thank you
--
Raz
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