Paper Info
Title
TrackLace: Data Management for Interlaced Magnetic Recording
Abstract
AbstractInterlaced Magnetic Recording (IMR) is a promising technology which achieves higher data density and lower write amplification (WA) than Shingled Magnetic Recording (SMR). In IMR, top tracks and bottom tracks are interlaced so each bottom track is partially overlapped with two adjacent top tracks. Top tracks can be updated without any WA, but bottom track updates require reading and rewriting of affected valid data on the two neighboring top tracks. There are few published studies discussing WA in IMR drives. We propose TrackLace to reduce WA for IMR. TrackLace consists of three techniques: Z-Alloc allocates user data to the tracks in alternating directions and spreads unallocated tracks among allocated tracks; Top-Buffer opportunistically utilizes unallocated top tracks to buffer bottom track updates; and Block-Swap progressively swaps bottom track hot data with top track cold data during high space utilization. To further optimize TrackLace performance, we propose a virtual frame design that can keep the relocated block (due to Top-Buffer or Block-Swap) close to its original location and an adaptive buffering mechanism that can avoid unnecessary redirections depending on the write locality. Evaluations show that TrackLace can reduce WA by 45 percent and lower average latency by 31percent compared with baseline schemes.
Year
DOI
Venue
2021
10.1109/TC.2020.2988257
Periodicals
Keywords
DocType
Volume
Resource management, Layout, Heat-assisted magnetic recording, Aerospace electronics, Writing, Power lasers, Interlaced magnetic recording, hard disks, data layout, allocation strategies, storage management
Journal
70
Issue
ISSN
Citations 
3
0018-9340
1
PageRank 
References 
Authors
0.36
0
7
Name
Order
Citations
PageRank
Fenggang Wu1164.08
Bingzhe Li24511.55
Baoquan Zhang310.36
Zhichao Cao417223.04
Jim Diehl5132.35
Hao Wen610823.70
David Hung-Chang Du763474.40