Stelios Korkotsides and Theodore Antonakopoulos:

The Effect of Using Multiple Code Rates on NVM-based Storage Systems

The IEICE Information and Communication Technology Forum 2016 - ICTF 2016, Patras, Greece, 6-8 July 2016.

Abstract: Non-Volatile Memories (NVM) continue to increase their density in order to achieve higher storage capacity, but require more powerful Error Correction Codes (ECC) to cover the need for data reliability. Low Density Parity Check (LDPC) codes provide a viable solution to this problem, at the cost of higher complexity and power consumption, which constraints most NVM devices to use a fixed LDPC rate. In the following paper, we present an architecture of a NVM based storage system which maximizes its lifetime by dynamically adapting the LDPC’s rate according to the aging condition of its devices. Furthermore, we have developed a queuing model in order to study the effects of different implementation choices on the system’s IO performance.

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