Efficient Failure Recovery in Multi-Disk Multimedia Servers
FTCS '95 Proceedings of the Twenty-Fifth International Symposium on Fault-Tolerant Computing
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In this paper, we present a novel failure recovery method that utilizes the inherent redundancy in video streams (rather than error-correcting codes) to recover from disk failures. The method combines a self-recovering JPEG (SRJ) compression algorithm with techniques for efficient placement of video streams on disk arrays to ensure that the user-invoked on-the-fly failure recovery process does not impose any additional load on the disk array. Moreover, by integrating the recovery process with the decompression of video streams, the self-recovering array of disks (SRAD) architecture makes it feasible to distribute the reconstruction process across the client sites, thereby enhancing the scalability of the multimedia server. We also demonstrate that such a SRAD architecture supports graceful degradation in the quality of recovered images with increase in the number of disk failures.