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    Samsung 850 Pro, software RAID-10, 400 MB/s dd slow sequential writes.

    Hello, We have put together few systems with 4x 512GB or 1TB Samsung 850 Pro drives in software RAID-10, in CentOS 6.7, 64-bit. New, functional drives. The results from dd, for all systems, are surprisingly disappointing : dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync yields around...
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