High Performance Metadata Integrity Protection in the WAFL Copy-on-Write File System

Harendra Kumar, Yuvraj Patel, Ram Kesavan, Sumith Makam

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

We introduce a low-cost incremental checksum technique that protects metadata blocks against in-memory scribbles, and a lightweight digest-based transaction auditing mechanism that enforces file system consistency invariants. Compared with previous work, our techniques reduce performance overhead by an order of magnitude. They also help distinguish scribbles from logic bugs. We also present a mechanism to pinpoint the cause of scribbles on production systems. Our techniques have been productized in the NetApp® WAFL® (Write Anywhere File Layout) file system with negligible performance overhead, greatly reducing corruption-related incidents over the past five years, based on millions of runtime hours.

Original languageEnglish
Title of host publication15th USENIX Conference on File and Storage Technologies (FAST 17)
Place of PublicationSanta Clara, CA
PublisherUSENIX Association
Pages197-212
Number of pages16
ISBN (Print)978-1-931971-36-2
Publication statusPublished - 2 Mar 2017
Event15th USENIX Conference on File and Storage Technologies - Santa Clara, United States
Duration: 27 Feb 20172 Mar 2017
Conference number: 15
https://www.usenix.org/conference/fast17

Conference

Conference15th USENIX Conference on File and Storage Technologies
Abbreviated titleFAST 2017
Country/TerritoryUnited States
CitySanta Clara
Period27/02/172/03/17
Internet address

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