Uberblok

Uberblok presents itself as a museum of ZFS, organized into a Hall and a series of rooms. Rather than explaining storage concepts in the abstract, it starts from the OpenZFS source and builds each exhibit around a specific idea, so visitors encounter the filesystem as it is actually implemented.

The core mechanism is a direct mapping between animation and code. Every animation corresponds to lines of OpenZFS zfs-2.4.4, frozen at commit 71a9f9578616, and every excerpt links back to those lines. The Hall, for example, displays struct uberblock from include/sys/uberblock_impl.h, showing how one small record names the root of an entire pool.

The site is aimed at storage engineers, filesystem students, and developers who already have some familiarity with ZFS or block storage. It rewards readers who are willing to follow links into the source tree, and it is less suited to newcomers seeking a high-level overview of ZFS features.

A practical approach is to move room by room and keep the linked source open alongside. Because the code is pinned to a specific commit, the material stays stable over time, but readers should remember that newer OpenZFS releases may differ from the frozen version shown here.

Overall, Uberblok is a focused reference for understanding ZFS through its code, best treated as a companion to the source rather than a standalone tutorial.