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Conference Papers Year : 2014

Transparent Throughput Elasticity for IaaS Cloud Storage Using Guest-Side Block-Level Caching

Bogdan Nicolae
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Pierre Riteau
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Kate Keahey
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Abstract

Storage elasticity on IaaS clouds is a crucial feature in the age of data-intensive computing. However, the traditional provisioning model of leveraging virtual disks of fixed capacity and performance characteristics has limited ability to match the increasingly dynamic nature of I/O application requirements. This mismatch is particularly problematic in the context of scientific applications that interleave periods of I/O inactivity with I/O intensive bursts. In this context, overprovisioning for best performance during peaks leads to significant extra costs because of unnecessarily tied-up resources, while any other trade-off leads to performance loss. This paper provides a transparent solution that automatically boosts I/O bandwidth during peaks for underlying virtual disks, effectively avoiding overprovisioning without performance loss. Our proposal relies on the idea of leveraging short-lived virtual disks of better performance characteristics (and thus more expensive) to act during peaks as a caching layer for the persistent virtual disks where the application data is stored. We show how this idea can be achieved efficiently at the block-device level, using a caching mechanism that leverages iterative behavior and learns from past experience. We demonstrate the benefits of our proposal both for microbenchmarks and for two real-life applications using large-scale experiments.
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Dates and versions

hal-01070227 , version 1 (30-09-2014)

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Bogdan Nicolae, Pierre Riteau, Kate Keahey. Transparent Throughput Elasticity for IaaS Cloud Storage Using Guest-Side Block-Level Caching. UCC'14: 7th IEEE/ACM International Conference on Utility and Cloud Computing, Dec 2014, London, United Kingdom. ⟨10.1109/UCC.2014.27⟩. ⟨hal-01070227⟩
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