Gunion(8): a new GEOM utility in the FreeBSD Kernel By: Marshall Kirk McKusick @BsdcanOrg

Uploaded August 2023 | Updated September 2026, 1 hour ago

Gunion(8): a new GEOM utility in the FreeBSD Kernel By: Marshall Kirk McKusick

This talk describes the gunion(8) utility that was added to the FreeBSD kernel in February 2022. The talk starts with an introduction to the FreeBSD GEOM kernel layer describing its location and function. The talk then describes how gunion(8) tracks changes to a read-only disk using a writable disk. The talk concludes with examples of problems for which gunion(8) can be effectively used.

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