A nine year study of file system and storage benchmarking
ACM Transactions on Storage (TOS)
Skippy: a new snapshot indexing method for time travel in the storage manager
Proceedings of the 2008 ACM SIGMOD international conference on Management of data
FAST '09 Proccedings of the 7th conference on File and storage technologies
ACM Transactions on Storage (TOS)
Transaction log based application error recovery and point in-time query
Proceedings of the VLDB Endowment
Proceedings of the 6th International Systems and Storage Conference
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A new generation of storage systems exploit decreasing storage costs to allow applications to take snapshots of past states and retain them for long durations. Over time, current snapshot techniques can produce large volumes of snapshots. Indiscriminately keeping all snapshots accessible is impractical, even if raw disk storage is cheap, because administering such large-volume storage is expensive over a long duration. Moreover, not all snapshots are equally valuable. Thresher is a new snapshot storage management system, based on novel copy-on-write snapshot techniques, that is the first to provide applications the ability to discriminate among snapshots efficiently. Valuable snapshots can remain accessible or stored with faster access while less valuable snapshots are discarded or moved off-line. Measurements of the Thresher prototype indicate that the new techniques are efficient and scalable, imposing minimal (4%) performance penalty on expected common workloads.