ZFS

Raised as a usability problem by 20 people on Hacker News over 15 years (2012–2026), in 21 threads.

People raised many different problems with ZFS, but no single problem has yet been raised by 3 people in 3 different months and threads.

Unreviewed issues were grouped by machine: Claude Haiku labelled each comment as a usability complaint, named what it's about and summed up the problem in a line, and a small model grouped similar problems. Nobody has checked them by hand. Expect mistakes.

The newest 21 complaints

ZFS is complicated to use, so people avoid it2026-10-23
Requires learning and manual setup, too hard for non-technical users2025-11-10
Interactive performance becomes so slow the mouse pointer crawls and typing lags2025-04-27
Must compile modules per machine or use unofficial repos, risking breakage and boot problems2025-01-14
Confusing to troubleshoot when something breaks; behaves like an opaque black box2023-06-21
Hard to find reliable procedures for common multi-stage operations like migrating disks2022-10-04
Commands are arcane and one mistake could destroy all data2022-05-04
Running ZFS on USB-attached disks is unpleasant to operate2022-04-21
Common pool tasks need many arcane commands, and one mistake could wipe the volume2022-04-06
Too many filesystem states, making it hard and nerve-wracking to operate safely2021-04-23
Commands are so easy to get wrong that one bad command could destroy data2021-04-22
Easy to trigger unintended actions or corner oneself while using it2020-07-20
Getting to files after something goes wrong is worrisomely complex, needing many steps2020-05-11
Hard to find recent docs among outdated documentation online2020-01-09
Performance tuning is complicated and takes ages, needing exact disk ordering2020-01-09
Easy to lose a disk by unplugging it without exporting, and hard to recover2018-08-27
Hard to find where the various command line switches are documented2018-02-14
Deduplication with ZFS has horrendous performance, making it painful to use2015-08-21
Pool failed to remount after reboot, requiring manual intervention to fix2014-09-11
Command line is slow managing hundreds of volumes and unusable during rebuilds2013-03-29
Copying data to backup ZFS disks loops with high CPU and is unusable2012-06-17