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July 2009 Calendar

CS Masters' Thesis Defense

Title: A Flash SSD Powered Data Replication Strategy for Video-on-Demand
Speaker: Ramya Manjunath
Date: Friday, July 24, 2009
Time: 1:00 p.m.
Location: GMCS 405
Thesis advisor: Dr Tao Xie

Abstract:
Video-on-Demand is a fast growing application with an ever increasing market size. NAND flash based SSD (Solid State Disks) presents the future of storage systems. Flash SSD (hereafter, flash disk) has quick read access response times and high energy-efficiency, which make it an attractive storage option for read-intensive applications like Video-on-Demand. Compared with traditional rotating based hard disk drives, flash disks are inadequate in terms of random write performance and usually are more expensive. To utilize the joint merits of hard disk drives and flash disks, in this research we propose a cost-effective hybrid storage architecture, which uses both solid state drives and hard disk drives for VoD servers. Further, we develop a data replication strategy called FLARE (Flash for Replication), which balances workload between flash disks and hard disks. To reduce the cost of replication, FLARE only makes replicas for the first several minutes of a popular video file. We also show how flash disks along with hard disk drives can be used effectively to store videos and their replicas. Results from a comprehensive simulation study based on a real-world VoD trace and a well-recognized disk simulator DiskSim demonstrate that FLARE consistently takes lesser time to serve the same number of requests when compared to the conventional striping strategy for Video-on-Demand servers.
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