Paper Info
Title
RAIDX: RAID without Striping
Abstract
Each disk of traditional RAID is logically divided into stripe units, and stripe units at the same location on each disk form a stripe. Thus, RAID striping forces homogeneity on its disks. Now, consider a heterogeneous array of hard disks, solid state disks, and RAM storage devices, with various access speeds and sizes. If this array is organized as a RAID system, then larger disks have wasted space and faster disks are under utilized. This paper proposes RAIDX, a new organization for a heterogeneous array. RAIDX disks are divided into chunks, larger disks have more chunks. Chunks from one or more disks are grouped into bundles, and RAIDX bundles chunks of data across its disks. The heterogeneity of disks causes unbalanced load distribution with some under-utilized disks and some bottleneck disks. To balance load across disks, RAIDX moves most frequently accessed chunks to under-utilized, faster disks and least frequently used chunks to larger, slower disks. Chunk remapping is done at the RAIDX level and does not impact file system to storage addressing. Experiments comparing local and networked RAIDX against local RAID show that RAIDX has faster throughput than RAID when the array is composed of heterogeneous disks: local RAIDX is 2.5x faster than RAID, networked RAIDX is 1.6x faster than local RAID.
Year
DOI
Venue
2016
10.1109/MASCOTS.2016.15
2016 IEEE 24th International Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS)
Keywords
Field
DocType
RAID,heterogeneous disks,array
Bottleneck,File system,Data striping,Computer science,Least frequently used,Parallel computing,Server,Standard RAID levels,Real-time computing,Disk Data Format,RAID,Distributed computing
Conference
ISSN
ISBN
Citations 
1526-7539
978-1-5090-3433-8
0
PageRank 
References 
Authors
0.34
7
2
Name
Order
Citations
PageRank
András Fekete100.34
Elizabeth Varki21149.71