Abstract

Hardware consolidation in the datacenter occasionally leads to scalability bottlenecks due to the heavy utilization of critical resources, such as the shared network bandwidth. Storage virtualization at the file interface achieves clear consistency semantics across data and metadata blocks, supports native file sharing between clients over the same or different hosts, and provides flexible configuration of the time period during which the data is durably staged at the host side. We improve the durability of shared storage in the proposed Arion system by supporting journaling at the kernel-level client of an object-based distributed filesystem. Over a prototype implementation of Arion that we developed, we experimentally demonstrate improved performance for specific durability guarantees, and reduced network and disk bandwidth at the storage servers. The scalable deployment of distributed filesystems in multitentant environments is challenging due to intermediate tran slation layers required for networked file access or identity management. We introduce the design of the Dike authorization architecture that combines native access control with tenant namespace isolation and compatibility to object-based filesystems. We use machines in a public cloud to experimentally evaluate a prototype implementation of Dike that we developed

Bio: Stergios V. Anastasiadis is currently Associate Professor at the Department of Computer Science and Engineering, University of Ioannina, Greece. Previously he served as Visiting Professor (fall 2009) at EPFL , Switzerland, Visiting Associate Professor (spring 2005) at the Technical University of Crete, Greece, and Visiting Assistant Professor (2001-2003) at Duke University, USA . He received MSc (‘96) and PhD (‘01) degrees in Computer Science from the University of Toronto, Canada. His research interests include operating systems and distributed systems with focus on data storage. For more info: www.cs.uoi.gr/~stergios