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Identifier

000364622

Title

Design and Evaluation of Solid-Stade Drive (SSD) Caches to Improve Storage I/O Perfomanceusing

Alternative Title

Σχεδιασμός και αξιολόγηση κρυφών μνημών για την βελτίωση του Storage I/O απόδοσης

Author

Κλωνάτος, Ιωάννης

Thesis advisor

Μπίλας, Άγγελος

Collaborator

Μαγκούτης Κων/νος

Abstract

Flash-based solid state drives (SSDs) exhibit potential for solving I/O bottlenecks by offering superior performance over hard disks for several workloads. For this reason, there is recently significant work towards integrating SSD caching in the I/O stack of modern storage systems. However, the proposed solutions are usually application specific. In this work we design Azor , an SSD-based I/O cache that operates at the block-level and is transparent to existing applications, such as databases. Our design provides various choices for associativity, write policies and cache line size, while targeting on maintaining a high degree of I/O concurrency. Our main contribution is that we explore how Azor can differentiate HDD blocks according to their expected importance on system performance. We design and analyze a two-level block selection scheme which dynamically differentiates HDD blocks, and selectively places them in the limited space of the SSD cache. We implement Azor in the Linux kernel and evaluate its effectiveness experimentally using realistic workloads and large problem sizes. We use a server-type platform and four I/O intensive workloads: TPC-H, SPECsfs2008, PostMark, and Hammerora. Our results show that as the cache size increases, our SSD-cache can enhance I/O performance by up to 14.02×, 1.63×, 1.72× and 55% for each workload respectively. In addition, our two-level block selection scheme can further enhance I/O performance compared to a typical SSD cache by up to 95%, 16%, 28%, and 34% for each workload, respectively. Not both levels of our two-level block selection scheme benefit all workloads. However, they never degrade performance, when used together or in isolation.

Language

English

Subject

SSD

Solid Stade disks

Storage I/O

Δίκτυα αξίας

Κρυφές μνήμες

Issue date

2011-03-18

Collection

School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses