Uberblok

What is Uberblok?

Uberblok is an interactive website that explains the OpenZFS file system by breaking it down into individual concepts. Each section focuses on one architectural idea, presents an interactive diagram you can manipulate, and displays the exact lines from the OpenZFS source code that implement it.

The content is based on the zfs-2.4.4 release, frozen at a specific commit. Every code excerpt is verified against that version, and none is written from memory. The site covers topics such as the uberblock structure, transaction group syncing, disk sector alignment, and pool import recovery logic.

Users can rotate and zoom interactive 3D views, step through transaction commits, and adjust parameters like sector size to see how the underlying ring buffer changes. The project is available in English, French, and Spanish, and the source code is hosted on GitHub.

Uberblok features

• Interactive diagrams that visualize ZFS internal structures
• Direct links to verified OpenZFS source code excerpts
• Step-by-step simulation of transaction group commits
• Adjustable disk sector size settings to show slot allocation
• Multilingual support for English, French, and Spanish
• 3D rotating and zoomable views of storage ring buffers

Who uses Uberblok and for what

• Learning how ZFS handles crash recovery and pool imports
• Understanding the role of the uberblock in maintaining consistency
• Studying how transaction groups sync data across multiple disks
• Visualizing the impact of different sector sizes on storage layout
• Reviewing verified OpenZFS implementation details for debugging

Uberblok FAQ

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