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Using Hints to Improve Inline Block-layer Deduplication

3 years 18 days ago
Using Hints to Improve Inline Block-layer Deduplication
Block-layer data deduplication allows file systems and applications to reap the benefits of deduplication without requiring per-system or per-application modifications. However, important information about data context (e.g., data vs. metadata writes) is lost at the block layer. Passing such context to the block layer can help improve deduplication performance and reliability. We implemented a hinting interface in an open-source block-layer deduplication system, dmdedup, that passes relevant context to the block layer, and evaluated two hints, NODEDUP and PREFETCH. To allow upper storage layers to pass hints based on the available context, we modified the VFS and file system layers to expose a hinting interface to user applications. We show that passing the NODEDUP hint speeds up applications by up to 5.3× on modern machines because the overhead of deduplication is avoided when it is unlikely to be beneficial. We also show that the PREFETCH hint accelerates
Sonam Mandal, Geoff Kuenning, Dongju Ok, Varun Sha
Added 03 Apr 2016
Updated 03 Apr 2016
Type Journal
Year 2016
Where FAST
Authors Sonam Mandal, Geoff Kuenning, Dongju Ok, Varun Shastry, Philip Shilane, Sun Zhen, Vasily Tarasov, Erez Zadok
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