NDLI: Revisiting widely held SSD expectations and rethinking system-level implications

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Revisiting widely held SSD expectations and rethinking system-level implications

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Revisiting widely held SSD expectations and rethinking system-level implications

Content Provider	ACM Digital Library
Author	Jung, Myoungsoo Kandemir, Mahmut
Abstract	Storage applications leveraging Solid State Disk (SSD) technology are being widely deployed in diverse computing systems. These applications accelerate system performance by exploiting several SSD-specific characteristics. However, modern SSDs have undergone a dramatic technology and architecture shift in the past few years, which makes widely held assumptions and expectations regarding them highly questionable. The main goal of this paper is to question popular assumptions and expectations regarding SSDs through an extensive experimental analysis using 6 state-of-the-art SSDs from different vendors. Our analysis leads to several conclusions which are either not reported in prior SSD literature, or contradict to current conceptions. For example, we found that SSDs are not biased toward read-intensive workloads in terms of performance and reliability. Specifically, random read performance of SSDs is worse than sequential and random write performance by 40% and 39% on average, and more importantly, the performance of sequential reads gets significantly worse over time. Further, we found that reads can shorten SSD lifetime more than writes, which is very unfortunate, given the fact that many existing systems/platforms already employ SSDs as read caches or in applications that are highly read intensive. We also performed a comprehensive study to understand the worst-case performance characteristics of our SSDs, and investigated the viability of recently proposed enhancements that are geared towards alleviating the worst-case performance challenges, such as TRIM commands and background-tasks. Lastly, we uncover the overheads of these enhancements and their limits, and discuss system-level implications.
Starting Page	203
Ending Page	216
Page Count	14
File Format	PDF
ISBN	9781450319003
DOI	10.1145/2465529.2465548
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-06-17
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Nand flash Garbage collection Disturbance Background task Buffer management Parallelism Solid state disk Reliability Trim command
Content Type	Text
Resource Type	Article

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