Alan Hanson

Oxide team engineer directly involved in dog-fooding and debugging Crucible storage issues, who leads investigative efforts and describes reproductions and timelines for the corruption.

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Nov 26, 2025 • 1h 21min

Grown-up ZFS Data Corruption Bug

Join Alan Hanson, an Oxide engineer skilled in debugging storage issues, Andy Fiddaman, a ZFS-analysis expert, and Matt Ahrens, co-inventor of ZFS, as they unravel a 18-year-old ZFS data corruption bug. They discuss the confusion over initial corruption, revealing write-ordering mishaps during ZIL transaction replay. Insights from Ahrens' earlier work aided in diagnosing the persistent problem. Tune in for fascinating tales of cross-team collaboration and technical breakthroughs that refine data integrity in storage systems!

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