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CSAR: cluster storage with adaptive redundancy

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2 Author(s)
M. Pillai ; Dept. of Comput. & Inf. Sci., Ohio State Univ., Columbus, OH, USA ; M. Lauria

Striped file systems such as the parallel virtual file system (PVFS) deliver high-bandwidth I/O to applications running on clusters. An open problem in the design of striped file systems is how to reduce their vulnerability to disk failures with the minimum performance penalty. We describe a novel data redundancy scheme designed specifically to address the performance issue. We demonstrate the new scheme within CSAR, a proof-of-concept implementation based on PVFS. By dynamically switching between RAID1 and RAID5 redundancy based on write size, CSAR consistently achieves the best of two worlds & RAID1 performance on small writes, and RAID5 efficiency on large writes. Using the popular parallel I/O benchmark BTIO, our scheme achieves 82% of the write bandwidth of the unmodified PVFS. We describe the issues in implementing our new scheme in a popular striped file system such as PVFS on a Linux cluster

Published in:

Parallel Processing, 2003. Proceedings. 2003 International Conference on

Date of Conference:

9-9 Oct. 2003