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S3R5: A Snapshot Storage System Based on ROW with Rapid Rollback, Recovery and Read-Write

As an essential aspect of distributed storage system, reliability plays a very important role. Open-source storage systems are becoming more and more popular in both academia and industry, while their data protection capabilities are rather limited. This paper focuses on the research of S3R5, a snapshot storage system based on ROW with rapid rollback, recovery and read-write. We present a rapid rollback method, which redirects writing and updating to a new allocated storage area and provides high performance of rollback operation. We also present a rapid recovery method, called reverse data recovery, which could rebuilt hot data and index in DRAM. What's more, we present a rapid read-write method, called multi-level unsorted index, which provides high performance of read-write operation. The evaluations show that that compared with Ceph, our work can provide better performance in rollback operation up to 44.40%, recovery operation up to 59.29% and read-write operation up to 34.19%.