Modeling drive-managed SMR performance

Mansour Shafaei, Mohammad Hossein Hajkazemi, Peter Desnoyers, Abutalib Aghayev

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Accurately modeling drive-managed Shingled Magnetic Recording (SMR) disks is a challenge, requiring an array of approaches including both existing disk modeling techniques as well as new techniques for inferring internal translation layer algorithms. In this work, we present the first predictive simulation model of a generally available drive-managed SMR disk. Despite the use of unknown proprietary algorithms in this device, our model that is derived from external measurements is able to predict mean latency within a few percent, and with an Root Mean Square (RMS) cumulative latency error of 25% or less for most workloads tested. These variations, although not small, are in most cases less than three times the drive-to-drive variation seen among seemingly identical drives.

Original languageEnglish (US)
Article numbera38
JournalACM Transactions on Storage
Volume13
Issue number4
DOIs
StatePublished - Dec 2017

All Science Journal Classification (ASJC) codes

  • Hardware and Architecture

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