On 08/21/2017 06:14 PM, Shaohua Li wrote> Can you elaborate more?
Storage presented to the host may have a RAID on the back-end. For NVMe SSDs, the 1.3 specification provided a field to advertise chunk boundaries: Identify Namespace NOIOB. We need to span the entire stripe to utilize the total available capacity, otherwise we'll repeatedly write to only a subset, increasing write amplification factor. The new PPL approach is designed to access the full capacity.
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