How migrating 0.0001% of address space saves 12% of energy in hybrid storage

B.J. van der Zwaag; M.G. Khatib; Pieter H. Hartel

How migrating 0.0001% of address space saves 12% of energy in hybrid storage

B.J. van der Zwaag, M.G. Khatib, Pieter H. Hartel

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Abstract

We present a simple, operating- system independent method to reduce the num- ber of seek operations and consequently reduce the energy consumption of a hybrid storage device consisting of a hard disk and a ﬂash memory. Trace-driven simulations show that migrating a tiny amount of the address space (0.0001%) from disk to ﬂash already results in a signi��?cant storage energy reduction (12%) at virtually no extra cost. We show that the amount of energy saving depends on which part of the address space is migrated, and we present two indicators for this, namely sequentiality and request frequency. Our simulations show that both are suitable as criterion for energy-saving ��?le placement methods in hybrid storage. We address potential wear problems in the ﬂash subsystem by presenting a simple way to pro- long its expected lifetime.

Original language	Undefined
Place of Publication	Enschede
Publisher	Centre for Telematics and Information Technology (CTIT)
Number of pages	15
Publication status	Published - 11 Sept 2007

Publication series

Name
Publisher	Centre for Telematics and Information Technology, University of Twente
No.	274/A4TR-2007.1
ISSN (Print)	1381-3625

Keywords

SCS-Cybersecurity
IR-64809
METIS-251005
EWI-12874

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Cite this

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