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Overlay networks with virtual resources need special forms of monitoring. The paper describe the development of a monitoring system for the Federated E-infrastructure Dedicated to European Researchers (FEDERICA) network. The paper describes the whole concept and the possibility of getting basic Input/Output (I/O) statistics from different layers of the network. From the monitoring point of view, the main problem of virtual systems is multidimensionality and variability. New ways have to be found to get basic information about the load and utilization of individual resources in this type of network, whose structure is randomly changing according to the demands of its users. The VMware ESX Server-3i hypervisor is elementary and it was originally intended for small, simple systems.
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