TrackLace: Data Management for Interlaced Magnetic Recording

Fenggang Wu, Bingzhe Li, Baoquan Zhang, Zhichao Cao, Jim Diehl, Hao Wen, David H.C. Du

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Interlaced 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.

Original languageEnglish (US)
Pages (from-to)347-358
Number of pages12
JournalIEEE Transactions on Computers
Volume70
Issue number3
DOIs
StatePublished - Mar 1 2021

Bibliographical note

Publisher Copyright:
© 2021 IEEE Computer Society. All rights reserved.

Keywords

  • Interlaced magnetic recording
  • allocation strategies
  • data layout
  • hard disks
  • storage management

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