
The MD RAID code for the Linux 4.9 kernel has some optimized functions making use of AVX512 extensions for RAID6 gen/recovery, the non-rotational bit is set when creating a RAID array with all SSDs, and setting the correct max_hw_sectors for RAID 5/6 modes should marginally improve the performance.
The MD code for Linux 4.9 also fixes a potential deadlock, a couple md-cluster bugs, and some other minor fixes.
More details on the MD updates for Linux 4.9 via this pull request.
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