PASS: A hybrid storage system for performance-synchronization tradeoffs using SSDs

Weijun Xiao, Xiaoqiang Lei, Ruixuan Li, Nohhyun Park, David J. Lilja

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

16 Scopus citations

Abstract

Recent advances in flash memory show great potential to replace traditional hard drives (HDDs) with flash-based solid state drives (SSDs) from personal computing to distributed systems. However, it is still a long way to go before completely using SSDs for enterprise data storage. Considering the cost, performance, and reliability of SSDs, a practical solution is to combine both SSDs and HDDs together. This paper proposes a hybrid storage system named PASS (Performance-dAta Synchronization - hybrid storage System) to tradeoff between I/O performance and data discrepancy between SSDs and HDDs. PASS includes a high-performance SSD and a traditional HDD to store mirrored data for reliability. All of the I/O requests are redirected to the primary SSD first and then the updated data blocks are copied to the backup HDD asynchronously. In order to hide the latency of copying operations, we use an I/O window to coalesce write requests and maintain an ordered I/O queue to shorten the HDD seek and rotation times. Depending on the charateristics of different I/O workloads, we develop an adaptive policy to dynamically balance the foreground I/O processing and background mirroring. We implement a prototype system of PASS by developing a Linux device driver and conduct experiments on the IoMeter, PostMark, and TPCC benchmarks. Our results show that PASS can achieve up to 12 times the performance of a RAID1 storage system for the IoMeter and PostMark workloads while tolerating less than 2% data discrepancy between the primary SSD and the backup HDD. More interestingly, while PASS does not produce any performance benefit for the TPC-C benchmark, it does allow the system to scale to larger sizes than when using an HDD-based RAID system alone.

Original languageEnglish (US)
Title of host publicationProceedings of the 2012 10th IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA 2012
Pages403-410
Number of pages8
DOIs
StatePublished - Oct 15 2012
Event2012 10th IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA 2012 - Madrid, Spain
Duration: Jul 10 2012Jul 13 2012

Publication series

NameProceedings of the 2012 10th IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA 2012

Other

Other2012 10th IEEE International Symposium on Parallel and Distributed Processing with Applications, ISPA 2012
CountrySpain
CityMadrid
Period7/10/127/13/12

Keywords

  • Data Management
  • Data Synchronization
  • Hybrid Storage
  • Solid State Drive

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