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RSA Laboratories

How to Tell if Your Cloud Files Are Vulnerable to Drive Crashes

Citation: K. Bowers, M. van Dijk, A. Juels, A. Oprea, and R. Rivest. How to Tell if Your Cloud Files Are Vulnerable to Drive Crashes. ACM CCS, 2011.

Abstract: This paper presents a new challenge—verifying that a remote server is storing a file in a fault-tolerant manner, i.e., such that it can survive hard-drive failures. We describe an approach called the Remote Assessment of Fault Tolerance (RAFT). The key technique in a RAFT is to measure the time taken for a server to respond to a read request for a collection of file blocks. The larger the number of hard drives across which a file is distributed, the faster the read-request response. Erasure codes also play an important role in our solution. We describe a theoretical framework for RAFTs and show experimentally that RAFTs can work in practice.

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