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Issue No.03 - March (2008 vol.19)
pp: 323-333
We present NFS-CD, an enhancement to the NFSv4 file system that reduces server load and increases the scalability of distributed file systems in computing clusters. The cluster delegation feature of NFS-CD allows data sharing among clients by extending the NFSv4 delegation model so that multiple clients manage a single file without interacting with the server. Based on cluster delegation, we implement a fast commit primitive, cooperative caching, and the ability to recover the uncommitted updates of a failed computer. NFS-CD supports both read and write operations in the cooperative cache without degrading the consistency model of NFSv4. We have implemented NFSCD by modifying the Linux NFSv4 client only. Because the server remains unchanged, NFS-CD preserves the simple administration model of NFSv4 and interoperates with standard NFS clients. NFS-CD offers improved performance when compared to NFSv4 at the expense of slightly weaker reliability guarantees.An experimental evaluation of our implementation, using industry standard benchmarks and application workloads, reveals that NFS-CD reduces server load by more than half. It also demonstrates that under most workloads file systems must support writes to the cooperative cache to achieve scale.
Alexandros Batsakis, Randal Burns, "NFS-CD: Write-Enabled Cooperative Caching in NFS", IEEE Transactions on Parallel & Distributed Systems, vol.19, no. 3, pp. 323-333, March 2008, doi:10.1109/TPDS.2008.14
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