Xen
Transparent migration of virtual infrastructures in large datacenters for Cloud Computing.
Roberto Bifulco — Mon, 08/22/2011 - 21:34
Cloud-enabled datacenters need advanced support for an integrated management of platform virtualization technologies. The networking infrastructure of large-scale datacenters is implemented according to redundant multi-tiered architectures whose layers operate at Layer 3 of the networking stack. Splitting the network infrastructure of a datacenter in a number of IP subnets, however, creates limits to the migration of Virtual Machines, reducing the possibility for administrators to efficiently balance the load and reduce the energy consumption of the whole infrastructure.
NEPTUNE for fast and easy deployment of OMF virtual network testbeds
Roberto Bifulco — Tue, 11/09/2010 - 19:39
In the last few years many emulation systems have been developed to evaluate the effectiveness of new protocols and applications in realistic and controllable network scenarios. NEPTUNE is a flexible architecture for cluster-based network emulation systems designed and implemented at University of Napoli Federico II.
Valutazione di piattaforme e tecnologie per sistemi di Cloud Computing
Roberto Bifulco — Tue, 08/10/2010 - 21:16
L’evoluzione delle tecnologie e delle modalità di fruizione delle stesse da parte degli utenti finali e/o grandi compagnie sta spostando la visione classica di ICT, ovvero grandi datacentre localizzati sul territorio e fruizione dei servizi erogati mediante Personal Computer.
Link Multiplexing in a Xen-based Network Emulation System
Roberto Bifulco — Sat, 05/08/2010 - 17:00
Network emulation has gained wide interest in the community of network researchers to evaluate the effectiveness of new protocols and applications in controllable and realistic network scenarios. To ensure scalability, modern emulation systems rely on the use of virtualization techniques to create complex networked systems by means of the computational resources available in a cluster of computers. In the context of network emulation systems, link multiplexing is the problem of emulating multiple point-to-point connections on top of a single Ethernet link.
Dynamic Virtual Cluster reconfiguration for efficient IaaS provisioning
Roberto Bifulco — Sat, 05/08/2010 - 16:49
Cloud computing is an emerging paradigm to provide Infrastructure as a Service (IaaS). In this paper we present NEPTUNE-IaaS, a software system able to support the whole lifecycle of IaaS provisioning in a Virtual Cluster environment. Our system allows interactive design of complex system topologies and their efficient mapping onto the available physical resources of a cluster. It also provides transparent VM migration features across geographically distributed datacenters, thanks to the adoption of the Service Switching paradigm.
Xen Networking
Roberto Bifulco — Mon, 07/28/2008 - 18:07
XEN e' un noto hypervisor per la gestione di macchine virtuali in Linux. Il nome delle macchine virtuali in XEN e' dom. Ogni vm (virtual machine) e' quindi individuata da uno specifico nome domU, dove U rappresenta un numero progressivo che viene assegnato in base all'ordine di creazione delle macchine stesse (es. dom1, dom2, ...).
La vm dom0 e' una speciale macchina, che si occupa della gestione dell'intera infrastruttura XEN. In seno a questa macchina e' gestito anche il networking per le macchine virtuali.
