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Taking Garbage Collection Overheads Off the Critical Path in SSDs

  • Myoungsoo Jung
  • Ramya Prabhakar
  • Mahmut Taylan Kandemir
Part of the Lecture Notes in Computer Science book series (LNCS, volume 7662)

Abstract

Solid state disks (SSDs) have the potential to revolutionize the storage system landscape, mostly due to their good random access performance, compared to hard disks. However, garbage collection (GC) in SSD introduces significant latencies and large performance variations, which renders widespread adoption of SSDs difficult. To address this issue, we present a novel garbage collection strategy, consisting of two components, called Advanced Garbage Collection (AGC) and Delayed Garbage Collection (DGC), that operate collectively to migrate GC operations from busy periods to idle periods. More specifically, AGC is employed to defer GC operations to idle periods in advance, based on the type of the idle periods and on-demand GC needs, whereas DGC complements AGC by handling the collections that could not be handled by AGC. Our comprehensive experimental analysis reveals that the proposed strategies provide stable SSD performance by significantly reducing GC overheads. Compared to the state-of-the-art GC strategies, P-FTL, L-FTL and H-FTL, our AGC+DGC scheme reduces GC overheads, on average, by about 66.7%, 96.7% and 98.2%, respectively.

Keywords

Critical Path Idle Time Busy Period Garbage Collection Idle Period 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© IFIP International Federation for Information Processing 2012

Authors and Affiliations

  • Myoungsoo Jung
    • 1
  • Ramya Prabhakar
    • 1
  • Mahmut Taylan Kandemir
    • 1
  1. 1.The Pennsylvania State UniversityUS

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