PROFS-Performance-Oriented Data Reorganization for Log-Structured File System on Multi-Zone Disks

I/O is a major performance bottleneck in modern computer systems. Modern disks use the Zone-Bit-Recording (ZBR) technology to increase the capacity. A direct consequence of ZBR is that outer tracks have higher data transfer rates. Because LFS uses large disk transfers, access times are mainly determined by the data transfer rate. This paper presents a novel performance-oriented data reorganizing scheme, called PROFS, which boosts the I/O performance of LFS (Log-structured File System). Our scheme reorganizes data on the disk during LFS garbage collection and system idle periods. By putting active data in the faster zones and inactive data in the slower zones, we can significantly improve the read and write performance. The reorganization overhead is minimal. We studied three different algorithms that are read-optimized, write-optimized and balanced. Simulation results based on five real-world and two synthetic traces showed that such algorithms can dramatically reduce the I/O response...

• Type: Conference
• Year: 2001
• Where: MASCOTS
• Authors: Jun Wang, Yiming Hu
• Keywords: Data Transfer Rate, LFS Garbage Collection, Lfs System, MASCOTS 2001, MASCOTS 2007