Operating systems, infrastructure, emulation, and technical history.
How to attribute ZFS space to boot environments, snapshots and clones, identify holds and origins, prune safely, and keep rollback capacity measurable.
A layer-by-layer GEOM investigation for mounted filesystems, swap, labels, encryption, mirrors, open consumers, stale metadata, and safe teardown.
How to observe devd events, match stable properties, call a constrained helper, control concurrency, test detach paths, and preserve boot reliability.
A safe FreeBSD swap-encryption procedure using a fresh GELI key each boot, verified device identity, fstab integration, crash-dump tradeoffs, and tests.
A method for classifying FreeBSD settings by lifecycle so boot tunables, runtime sysctls, service variables, and device hints live in the right file.
How kqueue registrations, filters, receipts, one-shot and edge-like behavior, descriptor lifetime, signals, timers, and process events actually work.
How FreeBSD's TrustedBSD MAC framework composes policy modules, labels and access checks, plus a safe path for selecting, testing, and auditing policy.
A practical model of netgraph nodes, hooks, control messages, data paths, ngctl inspection, socket integration, and safe teardown on FreeBSD.
How UFS Soft Updates, SU+J, fsck, and GEOM journaling differ, including crash guarantees, stable-write semantics, inspection, and safe changes.
A recovery-oriented ZFS replication workflow covering recursive snapshots, incremental ancestry, receive safety, resumable streams, holds, and audits.