Online Availability Upgrades for Parity-Based RAIDs through Supplementary Parity Augmentations

Provided by: Association for Computing Machinery
Topic: Storage
Format: PDF
In this paper, the authors propose a simple but powerful online availability upgrade mechanism, Supplementary Parity Augmentations (SPA), to address the availability issue in parity-based RAID systems. The basic idea of SPA is to store and update the supplementary parity units on one or a few newly augmented spare disks for online RAID systems in the operational mode, thus achieving the goals of improving the reconstruction performance while tolerating multiple disk failures and latent sector errors simultaneously.

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