Paper Info
Title
Optimizing RAID/SSD controllers with lifetime extension for flash-based SSD array.
Abstract
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 arrays. 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 arrays.
Year
DOI
Venue
2018
10.1145/3211332.3211338
LCTES
Keywords
Field
DocType
Error-relaxation, Lifetime, RAID, SSD arrays
Nand flash memory,Space management,Rack,Computer science,Reuse,Parallel computing,Lifetime extension,Data allocation,RAID,Embedded system
Conference
Volume
Issue
ISSN
53
6
0362-1340
Citations 
PageRank 
References 
2
0.39
19
Authors
4
Name
Order
Citations
PageRank
Lei Han14511.52
Zhaoyan Shen2299.79
Zili Shao31618134.03
Tao Li4513.00