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OpenZFS on Linux and FreeBSD

423 mentions on Hacker News by 226 people: 73 stories, 350 comments · first 2013-03-29 · latest 2026-10-12

Mentions per year 423 mentions · busiest year 2023 (86)
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  1. …I believe, 96% full in the spacemap for it to resort to best-fit instead of first-fit. [1] [1] - https://github.com/openzfs/zfs/blob/eaaed26ffb3a14c0c98ce1e6...
    comment by rincebrain · 2022-10-24 · in Maintaining sufficient free space with ZFS
  2. …RAID, it's also not expandable vdev for now since it's made for enterprise. RAIDZ expansion is here https://github.com/openzfs/zfs/pull/12225
    comment by fomine3 · 2022-10-05 · in ZFS 2.1.6
  3. …request for 2.1.6, but they chose to ship this and instantly open a branch for 2.1.7 pull requests. https://github.com/openzfs/zfs/pull/13886
    comment by thulle · 2022-10-04 · in ZFS 2.1.6
  4. …of zfs but I'd love to see these features merged sometimes in the future: - no overlayfs yet ( https://github.com/openzfs/zfs/pull/9414 ) - the docker zfs driver is very slow and buggy - best to create a sparse zvol with ext4/xfs/btrfs and…
    comment by nisa · 2022-10-04 · in ZFS 2.1.6
  5. ▲ 176
    ZFS 2.1.6
    story by lysp · 2022-10-04 · 106 comments
  6. Now if only https://github.com/openzfs/zfs/issues/10348 could be fixed. I'm using frequent zfs snapshots, but recovery is more annoying than I'd like.
    comment by tpolzer · 2022-09-18 · in $ rm Important.txt (uh oh)
  7. will come but not yet https://github.com/openzfs/zfs/pull/12225
    comment by fomine3 · 2022-08-18 · in 6 Raspberry Pis, 6 SSDs on a Mini ITX Motherboard
  8. …laptop. It works well but be aware that SWAP specifically on encrypted ZFS will lead to deadlock: https://github.com/openzfs/zfs/issues/7734 Thus I have planned to move the swap back to LUKS. If I cannot unlock everything by entering only…
    comment by nh2 · 2022-08-04 · in Ask HN: ZFS native encryption vs LUKS
  9. …[1]. As far as I know, the issue is now resolved, but I haven't followed this closely. [1] https://github.com/openzfs/zfs/issues/8259
    comment by uniqueuid · 2022-08-04 · in Ask HN: ZFS native encryption vs LUKS
  10. …that get lost, which I don't, because I have so many of them). Just very annoying and tedious. [0]: https://github.com/openzfs/zfs/issues/12014
    comment by indiv0 · 2022-08-04 · in Ask HN: ZFS native encryption vs LUKS
  11. …where nearly every word in the sentence is a url to a different encryption issue > [I recommend]( https://github.com/openzfs/zfs/issues/11679 ) [not using]( https://github.com/openzfs/zfs/issues/12014 ) [native encryption](…
    comment by dsp_person · 2022-08-04 · in Ask HN: ZFS native encryption vs LUKS
  12. …find the bug again. So that means you should test your setup precisely. [edit] Here is the issue: https://github.com/openzfs/zfs/issues/12594 The technical detail from that thread: "This happens because when sending raw encrypted datasets…
    comment by uniqueuid · 2022-08-04 · in Ask HN: ZFS native encryption vs LUKS
  13. They implemented it; it landed in May: https://github.com/openzfs/zfs/commit/f375b23c
    comment by Dagger2 · 2022-08-01 · in Show HN: Reduce SQLite database size by up to 80% with transparent compression
  14. …time spent memcpying to/from the ARC[0]. Direct IO support could eventually alleviate this[1]. [0]: https://github.com/openzfs/zfs/issues/8381 [1]: https://github.com/openzfs/zfs/pull/10018
    comment by mastax · 2022-07-27 · in Building a fast all-SSD NAS on a budget
  15. …and here's what looks like a script to do that on the current tip of master: https://github.com/openzfs/zfs/blob/master/copy-builtin
    comment by yjftsjthsd-h · 2022-06-20 · in Linux Threat Hunting: ‘Syslogk’ a kernel rootkit found in the wild
  16. …[2], the associated workaround [3], or the kernel.org bugzilla entry [4], interesting. [1] - https://github.com/openzfs/zfs/issues/13571 [2] - https://github.com/openzfs/zfs/issues/13232 [3] - https://github.com/openzfs/zfs/pull/13309 [4]…
    comment by rincebrain · 2022-06-20 · in Pipes, deadlocks, and strace annoyingly fixing them
  17. OpenZFS 2.0's sequential resilver may help: * https://github.com/openzfs/zfs/pull/10349 * https://github.com/openzfs/zfs/releases/tag/zfs-2.0.0
    comment by throw0101a · 2022-05-29 · in Building a Budget Homelab NAS Server
  18. …software is developed. Here's a list of failures from zfs, including many kernel panics for example https://github.com/openzfs/zfs/labels/Type%3A%20Defect - is it broken and shouldn't have been released?
    comment by viraptor · 2022-05-18 · in Bringing Bcachefs to Linux Mainline
  19. ZFS not having reflinks is still so sad. https://github.com/openzfs/zfs/issues/405
    comment by yencabulator · 2022-04-13 · in The Unexpected Importance of the Trailing Slash
  20. ▲ 11
    OpenZFS 2.1.3
    story by chungy · 2022-03-12 · 1 comment
  21. …with a race condition where the pool may not be mounted by the time systemd tries to use it. https://github.com/openzfs/zfs/issues/8885 that's (a) not really a bug in ZFS, and (b) "fails to boot sometimes" is pretty different from btrfs…
    comment by paulmd · 2022-03-08 · in ntfs2btrfs: In-place conversion of NTFS filesystem to Btrfs
  22. …on MacOS are mapped by the ZFS driver to the same function that implements fsync() on Linux: https://github.com/openzfs/zfs/blob/master/module/os/linux/z... For good measure, let us look at how syncfs() is implemented by ZFS on Linux:…
    comment by ryao · 2022-02-22 · in Apple's custom NVMes are amazingly fast – if you don't care about data integrity
  23. …should be fine as long as REQ_PREFLUSH is working properly. You can read a little about that here: https://github.com/openzfs/zfs/blob/453c63e9b74cea42d45e0bd3... https://elixir.bootlin.com/linux/v4.18/source/include/linux/...
    comment by ryao · 2022-02-22 · in Apple's custom NVMes are amazingly fast – if you don't care about data integrity
  24. …After that it'll take some time to make to all the distributions ( freenas, freebsd, etc. ) [0] https://github.com/openzfs/zfs/pull/12225
    comment by Naac · 2022-02-08 · in Raid-Z Expansion Feature for ZFS Goes Live
  25. …blockers and Linux maintainers not wanting to do a dual-licensed CDDL/GPL either, is their blocker: https://github.com/openzfs/zfs/issues/8314
    comment by tlamponi · 2022-02-05 · in Why Not ZFS (2021)
  26. …ZPOOL with RAIDZ Expansion: - https://arstechnica.com/gadgets/2021/06/raidz-expansion-code... - https://github.com/openzfs/zfs/pull/12225 By the way the author sounds like he is in love with LVM and Linux ecosystem and does not understand…
    comment by vermaden · 2022-02-04 · in Why Not ZFS (2021)
  27. …real O_DIRECT support[3]. [0]: https://openzfs.github.io/openzfs-docs/Performance%20and%20T... [1]: https://github.com/openzfs/zfs/pull/7823 [2]: https://github.com/openzfs/zfs/issues/8381 [3]: https://github.com/openzfs/zfs/pull/10018
    comment by mastax · 2021-12-22 · in Everything I've seen on optimizing Postgres on ZFS
  28. …of different test FS at the same time. ---- 0: https://news.ycombinator.com/item?id=29268907 1: https://github.com/openzfs/zfs/pull/9735#issuecomment-570082...
    comment by xoa · 2021-11-19 · in Zstandard RFC 8878
  29. …properties like utf8/normalization. ---- 0: https://jrs-s.net/2018/08/17/zfs-tuning-cheat-sheet/ 1: https://github.com/openzfs/zfs/pull/9735#issuecomment-570082... 2: https://news.ycombinator.com/item?id=29164727
    comment by xoa · 2021-11-18 · in Demystifying OpenZFS 2.0
  30. …[2]: http://dtrace.org/blogs/ahl/2012/11/08/zfs-trivia-metaslabs/ [3]: https://github.com/openzfs/zfs/blob/master/module/zfs/metasl... (note metaslab_df_free_pct) [4]: https://www.truenas.com/community/threads/zfs-tweak-for-firs.
    comment by magicalhippo · 2021-11-09 · in We saved millions in SSD costs by upgrading our filesystem
  31. …throughput limit first, as ZFS just writes ... a lot more, due to how blocks are stored internally: https://github.com/openzfs/zfs/issues/6584#issuecomment-3848... On an innodb database, I get about 3x compress ratio with ZSTD compression,…
    comment by throwdbaaway · 2021-11-08 · in The LZ4 introduced in PostgreSQL 14 provides faster compression
  32. …releases because kernel-internal symbols are not fully stable (unless I've seriously misunderstood https://github.com/openzfs/zfs/issues/11320 ). And since Stream is a rolling release, users will therefore experience breakage unless they…
    comment by yjftsjthsd-h · 2021-11-02 · in Fedora 35
  33. …you the real MVP. P.S. For those interested, the issue[1] is NVMe performance for OpenZFS[2] [1] https://github.com/openzfs/zfs/issues/8381 [2] https://twitter.com/OpenZFS/status/1452762896769953795
    comment by noaheverett · 2021-10-26 · in GitHub stale bot considered harmful
  34. Last I looked, ZFS didn't support reflinks. https://github.com/openzfs/zfs/issues/405
    comment by yencabulator · 2021-10-04 · in Podman in Linux
  35. ▲ 2
    OpenZFS 2.1.1
    story by georgyo · 2021-09-17 · 0 comments
  36. …usage bug) is real and in 0.7+ so far as I can tell. Ideally both would have been committed. [0]: https://github.com/openzfs/zfs/pull/6544
    comment by ComputerGuru · 2021-09-06 · in ZFS is mysteriously eating my CPU
  37. Actual issue here: https://github.com/openzfs/zfs/issues/6531 It seems the whole thing took place in 2017 and was fixed then (first by not calling the reclaim if used ARC memory was zero, then the root cause also fixed by using a PRNG…
    comment by ComputerGuru · 2021-09-06 · in ZFS is mysteriously eating my CPU
  38. ▲ 2
    OpenZFS v2.1.0 Released With dRAID Support
    story by turrini · 2021-07-05 · 0 comments
  39. ▲ 4
    ZFS 2.1.0 Released – With DRAID
    story by tlamponi · 2021-07-02 · 0 comments
  40. ▲ 2
    ZFS – Raidz Expansion Feature
    story by peperunas · 2021-06-30 · 0 comments
  41. https://github.com/openzfs/zfs/issues/7734
    comment by nwmcsween · 2021-06-19 · in ZFS fans, rejoice – RAIDz expansion will be a thing soon
  42. …will for the first time allow us to avoid building a completely new pool). [edit] The PR is here: https://github.com/openzfs/zfs/pull/12225 I also recommend reading the discussions in the ZFS repository - they are quite interesting and…
    comment by uniqueuid · 2021-06-18 · in ZFS fans, rejoice – RAIDz expansion will be a thing soon
  43. ▲ 1
    Raidz Expansion Feature
    story by throw0101a · 2021-06-14 · 1 comment
  44. ▲ 3
    ZFS Raidz Expansion Feature
    story by funkaster · 2021-06-12 · 0 comments
  45. ▲ 1
    Raidz expansion feature leaving alpha
    story by scrp · 2021-06-11 · 1 comment
  46. …deters me as a home user. ZFS has been working on developing raidz expansion for a while now at https://github.com/openzfs/zfs/pull/8853 but I feel that it's a one-man task with no support from the overall project due to that prevailing…
    comment by kylegordon · 2021-04-30 · in QNAP ships NAS backup software with hidden credentials
  47. …is part of it. See for example the zraid_test tool[2], which seems to do what you suggest. [1]: https://github.com/openzfs/zfs/tree/master/tests/zfs-tests [2]: https://github.com/openzfs/zfs/tree/master/cmd/raidz_test (run_rec_check_impl…
    comment by magicalhippo · 2021-04-22 · in Btrfs on Zoned Block Devices
  48. …to AWS. Practically you need to add the -w or --raw flag to zfs send to make it do this. [0] https://github.com/openzfs/zfs/releases/tag/zfs-0.8.0
    comment by agurk · 2021-03-23 · in Z3 – ZFS to S3 Backup/Restore Tool
  49. ▲ 3
    uZFS – to run ZFS modules in userspace
    story by BlackLotus89 · 2021-03-19 · 0 comments
  50. Is this feature related to the proposed RAID-Z expansion? https://github.com/openzfs/zfs/pull/8853 It's mentioned in the pull request comments. Maybe it will help?
    comment by matheusmoreira · 2021-02-18 · in OpenZFS – dRAID, Finally