raid6: rmw writes all the time?

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Hi all,

we got a new test system here and I just also tested btrfs raid6 on that. Write performance is slightly lower than hw-raid (LSI megasas) and md-raid6, but it probably would be much better than any of these two, if it wouldn't read all the during the writes. Is this a known issue? This is with linux-3.9.2.

Thanks,
Bernd

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