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VNsnap is a system that addresses reliability and resume-ability challenges for Virtual Networked Environments (VNEs) in the context of emerging cloud computing and “infrastructure as a service” (IaaS) paradigms. As VNsnap does not require any changes to the application and operating system states inside the Virtual Machines (VMs) that make up the cloud, it is particularly suited for virtual cloud environments where infrastructure provider has no control inside the VMs. VNsnap is based on Xen 3.1 virtual machine monitor; however, it can easily be ported to more recent releases of Xen. The two main components of VNsnap system are the VIOLIN virtual network and snapshot daemons.


  • “VNsnap: Taking Snapshots of Virtual Networked Infrastructures in the Cloud”. Ardalan Kangarlou, Patrick Eugster, Dongyan Xu. In IEEE Transactions on Services Computing (TSC), Special Issue on Cloud Computing, accepted in 2011 (DOI: 10.1109/TSC.2011.29).
  • “In-Network Live Snapshot Service for Recovering Virtual Infrastructures”. Ardalan Kangarlou, Dongyan Xu, Ulas Kozat, Pradeep Padala, Bob Lantz, Ken Igarashi. In IEEE Network, Special Issue on Cloud Computing, 25(4), 2011.
  • “VNsnap: Taking Snapshots of Virtual Networked Environments with Minimal Downtime”. Ardalan Kangarlou, Patrick Eugster, Dongyan Xu. In Proceedings of IEEE/IFIP International Conference on Dependable Systems and Networks (DSN-DCCS 2009), Estoril, Portugal, June 2009 (
  • “Taking Snapshots of Virtual Networked Environments”. Ardalan Kangarlou, Paul Ruth, Dongyan Xu, Patrick Eugster. In Proceedings of IEEE International Workshop on Virtualization Technology in Distributed Computing (VTDC 2007, in conjunction with SC07), Reno, NV, November 2007.
  • “VIOLIN: Virtual Internetworking on OverLay INfrastructure”. Xuxian Jiang, Dongyan Xu. In Department of Computer Sciences Technical Report CSD TR 03-027, Purdue University, July 2003.


GENI-VIOLIN: Distributed Suspend and Resume for GENI Experiments (joint work with DOCOMO USA Labs)


A prototype of VNsnap is available upon request. Please send email to



This project was sponsored in part by the National Science Foundation (NSF) under the following awards:

  • CNS-0546173
  • CNS-0720665
vnsnap.txt · Last modified: 2012/06/26 14:42 (external edit)