论文信息 - 19.6 Hybrid storage of ReRAM/TLC NAND Flash with RAID-5/6 for cloud data centers

19.6 Hybrid storage of ReRAM/TLC NAND Flash with RAID-5/6 for cloud data centers

A hybrid storage architecture of ReRAM and TLC (3b/cell) NAND Flash with RAID-5/6 is developed to meet cloud data-center requirements of reliability, speed and capacity. The storage controller enhances reliability and performance through five techniques with minimal area overhead. The first three approaches, (i) flexible RRef (FR), (ii) adaptive asymmetric coding (AAC), and (iii) verify trials reduction (VTR), are applied to 50nm ReRAM to improve the bit-error rate (BER) by 69% and performance by 97%. Techniques (iv) balanced RAID-5/6 and (v) bits/cell optimization (BCO) are applied to 2Xnm TLC NAND to reduce the failure rate by 98% and extend the lifetime (write/erase (W/E) cycles) by >22×, respectively.

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