PDL ABSTRACT

Aging Gracefully with Geriatrix: A File System Aging Tool

Carnegie Mellon University Parallel Data Lab Technical Report CMU-PDL-17-106, October 2017. Supersedes Carnegie Mellon University Parallel Data Lab Technical Report CMU-PDL-16-105. October, 2016.

Saurabh Kadekodi, Vaishnavh Nagarajan, Garth A. Gibson

Carnegie Mellon University

http://www.pdl.cmu.edu/

File system aging has been advocated for thorough analysis of any design, notably in 1997 [40], but it is cumbersome and often bypassed. Our aging study re-evaluates published file systems after aging using the original paper’s benchmarks. We see significant performance degradation on magnetic (HDD) and flash (SSD) disks. With performance of aged file systems on SSDs reduced by as much as 80% relative to the recreated results of prior papers, aging is perhaps more necessary now. More concerning, the rank ordering of aged and tested file systems can change versus published results.

We offer Geriatrix, a simple-to-use aging suite with built-in aging profiles with the goal of making it easier to age, and thereby harder to justify ignoring file system aging in storage research.

KEYWORDS: file systems, aging, fragmentation, benchmark, tool

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