Paper Info
Title
Reliability and performance enhancements for SSD RAID.
Abstract
NAND based solid state storage devices are almost ubiquitously used in safety-critical embedded devices, and recent advances have demonstrated RAID architectures specific to solid state storage devices resulting in increased data reliability, with architectural enhancements to solve the age convergence problem. However, these techniques require devices to be taken off-line while components are replaced—consequently these devices are of limited use in hard real time systems. There are further real time issues in that the conventional architectures ignore other characteristics of solid state devices such as garbage collection and meta data management. In this paper we investigate techniques that support the replacement of aged devices in the array in such a way that we provide continuous system reliability. We also improve the performance overhead of the reconstruction process using a novel data migration policy. The techniques are implemented and tested in a trace-driven simulator, and results demonstrate that average I/O response time is improved by up to 39% with improvement by up to 45% in its standard deviation, overheads in terms of device replacement time are negligible, and read performance is improved by an average of 8%.
Year
DOI
Venue
2017
10.1016/j.micpro.2016.11.012
Microprocessors and Microsystems
Keywords
Field
DocType
SSD RAID,Real time storage,SSD garbage collection,SSD RAID architecture,Hotswapping and data migration,Parity distribution
Non-standard RAID levels,Computer science,Parallel computing,Response time,NAND gate,Standard RAID levels,Real-time computing,Garbage collection,RAID,Solid-state storage,Data migration
Journal
Volume
ISSN
Citations 
52
0141-9331
1
PageRank 
References 
Authors
0.35
15
2
Name
Order
Citations
PageRank
Alistair A. McEwan18916.68
Muhammed Ziya Komsul231.74