Thursday, October 11, 2007
12:00 pm - 1:00 pm
Wean Hall 8220
Low-overhead Byzantine Fault-tolerant Storage
This talk presents an erasure-coded Byzantine fault-tolerant block storage protocol that is nearly as efficient as protocols that tolerate only crashes. Previous Byzantine fault-tolerant block storage protocols have either relied upon replication, which is inefficient for large blocks of data when tolerating multiple faults, or a combination of additional servers, extra computation, and versioned storage. To avoid these expensive techniques, our protocol employs novel mechanisms to optimize for the common case when faults and concurrency are rare. In the common case, a write operation completes in two rounds of communication and a read completes in one round. The protocol requires a short checksum comprised of cryptographic hashes and homomorphic fingerprints. It achieves throughput within 10% of the crash-tolerant protocol for writes and reads in failure-free runs when configured to tolerate up to 6 faulty servers and any number of faulty clients.
James Hendricks is a PhD student advised by Greg Ganger in the Computer Science Department at Carnegie Mellon. He is interested in the applied aspects of computer science, especially storage systems, fault tolerance, security, and network systems. James graduated PBK and TBP in EECS from Berkeley, and has worked at IBM Almaden, Cisco, and Los Alamos National Laboratory.
or visit http://www.pdl.cmu.edu/SDI/