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


Zwaag, Berend Jan van der and Khatib, Mohammed G. and Hartel, Pieter H. (2007) How migrating 0.0001% of address space saves 12% of energy in hybrid storage. [Report]

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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 significant 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
file 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.
Item Type:Report
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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