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SUMMARY:Data redundancy and maintenance in peer-to-peer file backup system
 s - Alessandro Duminuco - Institut Eurécom
DTSTART:20091001T103000Z
DTEND:20091001T110000Z
UID:TALK19941@talks.cam.ac.uk
CONTACT:Microsoft Research Cambridge Talks Admins
DESCRIPTION:The amount of digital data produced by users has grown tremend
 ously over the last decade. These data are very valuable and the need for 
 safe data backup is obvious. Solutions based on DVDs and external hard dri
 ves\, though very common\, are not practical and do not provide the needed
  level of reliability\, while centralized solutions are costly. For this r
 eason the research community has shown an increasing interest in the use o
 f Peer-to-Peer systems for file backup. The key property that makes Peer-t
 o-Peer systems appealing is self-scaling\, i.e. as more peers become part 
 of the system the service capacity increases along with the service demand
 . The design of a Peer-to-Peer file backup system is a complex task and pr
 esents a considerable number of challenging problems. Peers can be intermi
 ttently connected and can fail at a rate that is considerably higher than 
 in the case of centralized storage systems. My interest focused particular
 ly on how to efficiently provide reliable storage of data applying appropr
 iate redundancy schemes and adopting the right mechanisms to maintain such
  redundancy. This is not trivial since data maintenance in such systems ma
 y require significant resources in terms of storage space and communicatio
 n bandwidth. These resources are limited\, and if not efficiently managed\
 , the total amount of storage the system can safely provide will be signif
 icantly reduced. This presentation illustrates the different problems I ha
 ve tackled\, focusing especially on one of my contributions: Hierarchical 
 Codes\, a data redundancy scheme efficient in terms of both\, storage and 
 communication bandwidth. 
LOCATION:Small Lecture Room\, Microsoft Research\, Roger Needham Building\
 , 7 J J Thomson Avenue\, Cambridge CB3 0FB
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