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SUMMARY:Durability and Access Control for Scalable Distributed Filesystems
  - Stergios Anastasiadis (University of Ioannina)
DTSTART:20151015T140000Z
DTEND:20151015T150000Z
UID:TALK60664@talks.cam.ac.uk
CONTACT:Eiko Yoneki
DESCRIPTION:Hardware consolidation in the datacenter occasionally leads to
  scalability bottlenecks due to the heavy utilization of critical resource
 s\, such as the shared network bandwidth. Storage virtualization at the fi
 le interface achieves clear consistency semantics across data and metadata
  blocks\, supports native file sharing between clients over the same or di
 fferent hosts\, and provides flexible configuration of the time period dur
 ing which the data is durably staged at the host side. We improve the dura
 bility of shared storage in the proposed Arion system by supporting journa
 ling at the kernel-level client of an object-based distributed filesystem.
  Over a prototype implementation of Arion that we developed\, we experimen
 tally demonstrate improved performance for specific durability guarantees\
 , and reduced network and disk bandwidth at the storage servers. The scala
 ble deployment of distributed filesystems in multitentant environments is 
 challenging due to intermediate tran\n slation\n layers required for netwo
 rked file access or identity management. We introduce the design of the Di
 ke authorization architecture that combines native access control with ten
 ant namespace isolation and compatibility to object-based filesystems. We 
 use machines in a public cloud to experimentally evaluate a prototype impl
 ementation of Dike that we developed\n\nBio: Stergios V. Anastasiadis is c
 urrently Associate Professor at the Department of Computer Science and Eng
 ineering\, University of Ioannina\, Greece. Previously he served as Visiti
 ng Professor (fall 2009) at EPFL\, Switzerland\, Visiting Associate Profes
 sor (spring 2005) at the Technical University of Crete\, Greece\, and Visi
 ting Assistant Professor (2001-2003) at Duke University\, USA. He received
  MSc ('96) and PhD ('01) degrees in Computer Science from the University o
 f Toronto\, Canada. His research interests include operating systems and d
 istributed systems with focus on data storage. For more info: www.cs.uoi.g
 r/~stergios
LOCATION:FW26\, Computer Laboratory\, William Gates Building
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