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Locating Logical Volumes in Large-Scale Networks

Mahalingam, Mallik; Karamanolis, Christos; Karlsson, Magnus; Xu, Zhichen


Keyword(s): logical volumes; DNS; BGP; volume location; organizing volumes

Abstract: Storage is increasingly becoming a commodity shared in global scale, either within the infrastructure of large organizations or by outsourcing to Storage Service Providers. Storage resources are managed and shared in the form of logical volumes; that is, virtual disks that aggregate resources from multiple, distributed physical devices and storage area networks. Logical volumes are dynamically assigned to servers according to a global resource utility model. This paper focuses on the problem of locating and accessing logical volumes in very large scale. Our goal is to devise mechanisms that are least intrusive to the existing Internet infrastructure. Two methods are proposed, based on DNS name resolution and BGP routing, respectively. The former is based on the current DNS protocols and infrastructure; the latter requires extensions to the existing BGP protocols. The two approaches are evaluated by means of simulations, based on realistic workloads and actual Internet topology. It is shown that the simpler and less intrusive DNS-based approach performs sufficiently well, for even small caches on the clients. Notes: To be published in the joint Tenth NASA Goddard Conference on Mass Storage Systems and Technologies/Nineteenth IEEE Symposium on Mass Storage Systems, 15-18 April 2002, Adelphi, MD

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