Adaptive Block Rearrangement Under UNIX
Sedat Akyürek, Kenneth Salem · Software Practice and Experience · 1997
An adaptive UNIX disk device driver is described. To reduce seek times, the driver copies frequently-referenced blocks from their original locations to reserved space near the center of the disk. Block reference frequencies need not be known in advance. Instead, they are estimated by monitoring the stream of arriving requests. Measurements show that the adaptive driver reduces seek times and response times substantially. © 1997 by John Wiley & Sons, Ltd.