In this paper, we investigate the reliability in a petabyte scale storage system built from thousands of Object-Based
Storage Devices and study the mechanisms to protect data loss when disk failure happens. We delve in two underlying
redundancy mechanisms: 2-way mirroring, 3-way mirroring. To accelerate data reconstruction, Fast Mirroring Copy is
employed where the reconstructed objects are stored on different OBSDs throughout the system. A SMART reliability
for enhancing the reliability in very large-scale storage system is proposed. Results show that our SMART Reliability
Mechanism can utilize the spare resources (including processing, network, and storage resources) to improve the
reliability in very large storage systems.
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