VNsnap: Taking Snapshots of Virtual Networked Environments With Minimal Downtime

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Executive Summary

A Virtual Networked Environment (VNE) consists of Virtual Machines (VMs) connected by a virtual network. It has been adopted to create "Virtual infrastructures" for individual users on a shared cloud computing infrastructure. The ability to take snapshots of an entire VNE - including images of the VMs with their execution, communication and storage states - yields a unique approach to reliability as a snapshot can restore the operation of an entire virtual infrastructure. The authors present VN-snap, a system that takes distributed snapshots of VNEs. Unlike existing distributed snapshot/checkpointing solutions, VNsnap does not require any modifications to the applications, libraries, or (guest) operating systems running in the VMs.

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