The ADvanced Systems Laboratory (ADSL)
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Removing the Costs and Retaining the Benefits of Flash-Based SSD Virtualization with FSDV
Yiying Zhang,
Andrea C. Arpaci-Dusseau,
Remzi H. Arpaci-Dusseau
Department of Computer Sciences,
University of Wisconsin-Madison
Abstract:
We present the design, implementation, and
evaluation of the File System De-Virtualizer (FSDV), a
system that dynamically removes a layer of indirection
common in modern storage stacks and decreases indi-
rection space and performance costs. FSDV is a flexible,
light-weight tool that de-virtualizes data by changing file
system pointers to use device physical addresses. When
FSDV is not running, the file system and the device both
maintain their virtualization layers and perform normal
I/O operations. We implement FSDV with ext3 and an emulated flash-based SSD. Our evaluation results show that
FSDV can significantly reduce indirection mapping table
space in a dynamic way while preserving the foreground
I/O performance. We also demonstrate that FSDV only
requires small changes to existing storage systems.
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