The ADvanced Systems Laboratory (ADSL)
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Snapshots in a Flash with ioSnap
Sriram Subramanian, Swaminathan Sundararaman, Nisha Talagala, Fusion-io, Andrea C. Arpaci-Dusseau, Remzi H. Arpaci-Dusseau, Department of Computer Sciences, University of Wisconsin-Madison
Abstract:
Snapshots are a common and heavily relied upon feature in storage systems. The
high performance of flash-based storage systems brings new, more stringent,
requirements for this classic capability. We present ioSnap, a flash optimized
snapshot system. Through careful design exploiting common snapshot usage
patterns and flash oriented optimizations, including leveraging native
characteristics of Flash Translation Layers, ioSnap delivers low-overhead
snapshots with minimal disruption to foreground traffic. Through our
evaluation, we show that ioSnap incurs negligible performance overhead
during normal operation, and that common-case operations such as snapshot
creation and deletion incur little cost. We also demonstrate techniques to
mitigate the performance impact on foreground I/O during intensive snapshot
operations such as activation. Overall, ioSnap represents a case study of
how to integrate snapshots into a modern, well-engineered flash-based
storage system.
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