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OSDI '04 — Abstract
Pp. 363–378 of the Proceedings
Energy-Efficiency and Storage Flexibility in the Blue File System
Edmund B. Nightingale and Jason Flinn, University of Michigan
Abstract
A fundamental vision driving pervasive computing research
is access to personal and shared data anywhere
at anytime. In many ways, this vision is close to being
realized. Wireless networks such as 802.11 offer connectivity
to small, mobile devices. Portable storage, such as
mobile disks and USB keychains, let users carry several
gigabytes of data in their pockets. Yet, at least three substantial
barriers to pervasive data access remain. First,
power-hungry network and storage devices tax the limited
battery capacity of mobile computers. Second, the
danger of viewing stale data or making inconsistent updates
grows as objects are replicated across more computers
and portable storage devices. Third, mobile data
access performance can suffer due to variable storage
access times caused by dynamic power management, mobility,
and use of heterogeneous storage devices. To overcome
these barriers, we have built a new distributed file
system called BlueFS. Compared to the Coda file system,
BlueFS reduces file system energy usage by up to 55%
and provides up to 3 times faster access to data replicated
on portable storage.
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