MOLAR: A cost-efficient, high-performance hybrid storage cache

Yi Liu, Xiongzi Ge, Xiaoxia Huang, David H Du

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

This paper proposes a deMOtion-based, fLAsh-awaRe hybrid storage cache model, named MOLAR, to effectively integrate Flash-based Solid State Disks (SSDs) into traditional DRAM-based memory storage systems. In MOLAR, a flash-aware I/O path structure is designed to adapt the asymmetric read and write performance of SSD and moreover to reduce useless write operations. A new control metric, demotion count, is proposed to wisely select the evicted data blocks from DRAM to reside in SSD. Besides, for SSD can improve internal data placement from data access hints, the Logical Block Addresses (LBAs) in SSD are grouped into the long-lived region and the short-lived region self-adaptively via a heuristic control algorithm based on the change of data block demotion count. Through trace-driven simulations, the overall hit ratio in MOLAR outperforms two traditional policies from 1.44% to 5.34%. The average write latency in SSD is reduced by 3.5 X. Moreover, write amplification is effectively reduced by about 36% in two typical flash address mapping policies.

Original languageEnglish (US)
Title of host publication2013 IEEE International Conference on Cluster Computing, CLUSTER 2013
DOIs
StatePublished - 2013
Event15th IEEE International Conference on Cluster Computing, CLUSTER 2013 - Indianapolis, IN, United States
Duration: Sep 23 2013Sep 27 2013

Publication series

NameProceedings - IEEE International Conference on Cluster Computing, ICCC
ISSN (Print)1552-5244

Other

Other15th IEEE International Conference on Cluster Computing, CLUSTER 2013
Country/TerritoryUnited States
CityIndianapolis, IN
Period9/23/139/27/13

Keywords

  • Demotion Count
  • Hybrid Storage Cache
  • Solid State Drives

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