Write a Blog >>
LCTES 2018
co-located with PLDI 2018

Flash-based SSD RAID arrays are increasingly being deployed in data centers. Compared with HDD arrays, SSD arrays drastically enhance storage density and I/O performance, and reduce power and rack space. Nevertheless, SSDs suffer aging issues. Though prior studies have been conducted to address this disadvantage, effective techniques of RAID/SSD controllers are urgently needed to extend the lifetime of SSD arrays.

In this paper, we for the first time apply approximate storage via the interplay of RAID and SSD controllers to optimize the lifespan of SSD arrays. Our basic idea is to reuse faulty blocks (those contain pages with uncorrectable errors) to store approximate data (which can tolerate more errors). By relaxing the integrity of flash blocks, we observed that the endurance of NAND flash memory can be significantly boosted, thereby providing huge potentials to significantly extend the lifetime of SSDs. Based on this observation, we propose the use of an efficient space management scheme for data allocation and FTL strategies by coordinating the interplay of RAID and SSD controllers to optimize the lifetime of SSD array. We implemented a prototype, called FreeRAID, based on an SSD array simulator. Our experiments show that we can significantly increase the lifetime by up to 2.17× compared with conventional SSD-based RAID array.

Tue 19 Jun

Displayed time zone: Eastern Time (US & Canada) change

14:00 - 15:40
Full paper session on Adaptation and HardwareLCTES 2018 at Discovery AB
14:00
25m
Full-paper
Adaptive Deep Learning Model Selection on Embedded Systems
LCTES 2018
Ben Taylor Lancaster University, UK, Vicent Sanz Marco Lancaster University, Willy Wolff Lancaster University, Yehia Elkhatib Lancaster University, Zheng Wang Lancaster University
14:25
25m
Full-paper
Optimizing RAID/SSD Controllers with Lifetime Extension for Flash-based SSD Array
LCTES 2018
Lei Han , Zhaoyan Shen The Hong Kong Polytechnic University, Zili Shao The Hong Kong Polytechnic University, Tao Li University of Florida
14:50
25m
Full-paper
Verification of Coarse-Grained Reconfigurable Arrays through Random Test Programs
LCTES 2018
Bernhard Egger Seoul National University, Eunjin Song Seoul National University, Hochan Lee Seoul National University, Daeyoung Shin Seoul National University
15:15
25m
Full-paper
Decoupling Address Generation from Loads and Stores to Improve Data Access Energy Efficiency
LCTES 2018
Michael Stokes Florida State University, Ryan Baird Florida State University, Zhaoxiang Jin Michigan Technological University, David B. Whalley , Soner Onder Michigan Technological University