DocumentCode :
2821424
Title :
Indirection systems for shingled-recording disk drives
Author :
Cassuto, Yuval ; Sanvido, Marco A A ; Guyot, Cyril ; Hall, David R. ; Bandic, Zvonimir Z.
Author_Institution :
San Jose Res. Center, Hitachi Global Storage Technol., San Jose, CA, USA
fYear :
2010
fDate :
3-7 May 2010
Firstpage :
1
Lastpage :
14
Abstract :
Shingled magnetic recording is a promising technology to increase the capacity of hard-disk drives with no significant cost impact. Its main drawback is that random-write access to the disk is restricted due to overlap in the layout of data tracks. For computing and storage systems to enjoy the increased capacity, it is necessary to mitigate these access restrictions, and present a storage device that serves unrestricted read/write requests with adequate performance. This paper proposes two different indirection systems to mask access restrictions and optimize performance. The first one is a diskcache based architecture that provides unrestricted access with manageable drop in performance. A second, more complex indirection system, utilizes a new storage unit called S-block. It is shown that the S-block architecture allows good sustained random-write performance, a point where the disk-cache architecture fails. The organization and algorithms of both architectures are specified in detail. Each was implemented and simulated as a discrete-event simulation, mimicking its operation on real storage devices. For the performance evaluation both synthetic workloads and traces from real workloads were used.
Keywords :
disc drives; discrete event simulation; hard discs; magnetic recording; write-once storage; S-block architecture; data track; discrete event simulation; disk cache based architecture; hard disk drive; indirection system; performance optimization; random write access; real storage device; shingled magnetic recording; shingled recording disk drive; storage system; unrestricted read/write request; Computer architecture; Disk drives; File systems; Hard disks; Heat-assisted magnetic recording; Interference; Laboratories; Magnetic heads; Magnetic memory; Magnetic recording;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Mass Storage Systems and Technologies (MSST), 2010 IEEE 26th Symposium on
Conference_Location :
Incline Village, NV
Print_ISBN :
978-1-4244-7152-2
Electronic_ISBN :
978-1-4244-7153-9
Type :
conf
DOI :
10.1109/MSST.2010.5496971
Filename :
5496971
Link To Document :
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