NDLI: Towards VM Consolidation Using a Hierarchy of Idle States

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Towards VM Consolidation Using a Hierarchy of Idle States

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Towards VM Consolidation Using a Hierarchy of Idle States

Content Provider	ACM Digital Library
Author	Keshav, S. Singh, Rayman Preet Brecht, Tim
Abstract	Typical VM consolidation approaches re-pack VMs into fewer physical machines, resulting in energy and cost savings [13, 19, 23, 40]. Recent work has explored a just-in time approach to VM consolidation by transitioning VMsto an inactive state when idle and activating them on the arrival of client requests[17, 21]. This leads to increased VM density at the cost of an increase in client request latency (called miss penalty). The VM density so obtained, although greater, is still limited by the number of VMs that can be hosted in the one inactive state. If idle VMs were hosted in multiple inactive states, VM density can be increased further while ensuring small miss penalties. However, VMs in different inactive states have different capacities, activation times, and resource requirements. Therefore, a key question is: How should VMs be transitioned between different states to minimize the expected miss penalty? This paper explores the hosting of idle VMs in a hierarchy of multiple such inactive states, and studies the effect of different idle VMmanagement policies on VMdensity and miss penalties. We formulate a mathematical model for the problem, and provide a theoretical lower bound on the miss penalty. Using an off-the-shelf virtualization solution (LXC [2]), we demonstrate how the required model parameters can be obtained. We evaluate a variety of policies and quantify their miss penalties for different VM densities. We observe that some policies consolidate up to 550 VMs per machine with average miss penalties smaller than 1 ms.
Starting Page	107
Ending Page	119
Page Count	13
File Format	PDF
ISBN	9781450334501
DOI	10.1145/2731186.2731195
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-03-14
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Cloud computing Vm hierarchy Vm consolidation Virtual machines Virtualization Vm density
Content Type	Text
Resource Type	Article

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