Paper Info
Title
Optimizing NAND flash-based SSDs via retention relaxation
Abstract
As NAND Flash technology continues to scale down and more bits are stored in a cell, the raw reliability of NAND Flash memories degrades inevitably. To meet the retention capability required for a reliable storage system, we see a trend of longer write latency and more complex ECCs employed in an SSD storage system. These greatly impact the performance of future SSDs. In this paper, we present the first work to improve SSD performance via retention relaxation. NAND Flash is typically required to retain data for 1 to 10 years according to industrial standards. However, we observe that many data are over-written in hours or days in several popular workloads in datacenters. The gap between the specification guarantee and actual programs' needs can be exploited to improve write speed or ECCs' cost and performance. To exploit this opportunity, we propose a system design that allows data to be written in various latencies or protected by different ECC codes without hampering reliability. Simulation results show that via write speed optimization, we can achieve 1:8-5:7× write response time speedup. We also show that for future SSDs, retention relaxation can bring both performance and cost benefits to the ECC architecture.
Year
Venue
Keywords
2012
FAST
nand flash memory,retention capability,optimizing nand flash-based ssds,future ssds,nand flash,nand flash technology,system design,ssd performance,reliable storage system,retention relaxation,ssd storage system
Field
DocType
Citations 
Computer science,Latency (engineering),Computer data storage,Parallel computing,Systems design,Response time,NAND gate,Exploit,Real-time computing,Computer hardware,Speedup
Conference
62
PageRank 
References 
Authors
2.09
18
3
Name
Order
Citations
PageRank
Ren-Shuo Liu11419.86
Chia-Lin Yang2103376.39
Wu Wei320414.84