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Track-Aligned Extents: Matching Access Patterns to Disk Drive Characteristics
Track-aligned extents (traxtents) utilize disk-specific knowledge to match access patterns to the strengths of modern disks. By allocating and accessing related data on disk track boundaries, a system can avoid most rotational latency and track crossing overheads. Avoiding these overheads can increase disk access efficiency by up to 50% for mid-sized requests (100Ð500 KB). This paper describes traxtents, algorithms for detecting track boundaries, and some uses of traxtents in file systems and video servers. For large-file workloads, a version of FreeBSD's FFS implementation that exploits traxtents reduces application run times by up to 20% compared to the original version. A video server using traxtent-based requests can support 56% more concurrent streams at the same startup latency and buffer space. For LFS, 44% lower overall write cost for track-sized segments can be achieved.
author = {Christopher R. Lumb},
title = {{Track-Aligned} Extents: Matching Access Patterns to Disk Drive Characteristics},
booktitle = {Conference on File and Storage Technologies (FAST 02)},
year = {2002},
address = {Monterey, CA},
url = {https://www.usenix.org/conference/fast-02/track-aligned-extents-matching-access-patterns-disk-drive-characteristics},
publisher = {USENIX Association},
month = jan
}
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