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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. …code for that specific purpose, so I might have missed functionality that would provide this. [1] - https://github.com/openzfs/zfs/issues/10255#issuecomment-620...
    comment by rincebrain · 2023-07-04 · in ZFS 2.2.0 (RC): Block Cloning merged
  2. > I am looking forward to the Direct IO speed improvements for NVMe drives with https://github.com/openzfs/zfs/pull/10018 See also "Scaling ZFS for NVMe" by Allan Jude at EuroBSDcon 2022: * https://www.youtube.com/watch?v=v8sl8gj9UnA
    comment by throw0101c · 2023-07-04 · in ZFS 2.2.0 (RC): Block Cloning merged
  3. …well, easy to setup. I am looking forward to the Direct IO speed improvements for NVMe drives with https://github.com/openzfs/zfs/pull/10018 edit: one thing I forgot to mention is, when creating your pool make sure to import your drives by…
    comment by noaheverett · 2023-07-04 · in ZFS 2.2.0 (RC): Block Cloning merged
  4. Also see this issue: https://github.com/openzfs/zfs/issues/405 > It is in FreeBSD main branch now, but disabled by default just to be safe till after 14.0 released, where it will be included. Can be enabled with loader tunable there. >…
    comment by albertzeyer · 2023-07-04 · in ZFS 2.2.0 (RC): Block Cloning merged
  5. The zero cost abstraction remarks remind me of this code that I recently wrote: https://github.com/openzfs/zfs/commit/677c6f8457943fe5b56d7a... In order to make that fast, I did C++-style generics and inlining in C via the CPP. However, it…
    comment by ryao · 2023-05-30 · in Why I'm Done with Rust
  6. …made significant changes to some relevant APIs -- I noticed OpenZFS is not released for 6.3 yet. https://github.com/openzfs/zfs/issues/14622
    comment by mholt · 2023-05-26 · in XFS metadata corruption after upgrade to 6.3.3 kernel
  7. …but this is not what I expected: https://github.com/ellie/atuin/issues/952#issuecomment-15378... https://github.com/openzfs/zfs/issues/14290 Apparently when SQLite calls `ftruncate` on the `-shm` file, ZFS will sometimes block for several…
    comment by mastax · 2023-05-25 · in Cases where full scans are better than indexes
  8. > For double or triple parity, we use a special case of Reed-Solomon coding https://github.com/openzfs/zfs/blob/zfs-2.1-release/module/z...
    comment by matja · 2023-05-23 · in Benchmarking Intel, AMD and Graviton Using Erasure Coding Workloads
  9. …You don't like it? You prioritize reflinks (ZFS just merged block cloning BTW, so hello reflinks: https://github.com/openzfs/zfs/pull/13392 ) or offline dedup over RAIDZ? Fine. But make sure your favorite filesystem (or your new…
    comment by mustache_kimono · 2023-05-12 · in Bcachefs – A New COW Filesystem
  10. https://github.com/openzfs/zfs/issues/10516 The data goes through two caches instead of just page cache or just arc as far as I understand it.
    comment by viraptor · 2023-05-11 · in Bcachefs – A New COW Filesystem
  11. …issues, I was likely thinking of 6.2.8 breaking it, where 6.2.7 was fine. Point stands, though. https://github.com/openzfs/zfs/issues/14658 Regarding 6.3 support, it apparently is merged in the master branch, but no release as of yet.…
    comment by vladvasiliu · 2023-05-11 · in Bcachefs – A New COW Filesystem
  12. The author has refactored their branch with guidance and promoted their draft pr to open last month. https://github.com/openzfs/zfs/pull/14034
    comment by infogulch · 2023-04-22 · in Windows on Btrfs
  13. There is the same (and ignored) problem in OpenZFS: https://github.com/openzfs/zfs/issues/14762 Please vote there.
    comment by pshirshov · 2023-04-18 · in PSA: Upgrade your LUKS key derivation function
  14. …of whether and how big of an issue this is, from what I understand OpenZFS uses the same KDF: https://github.com/openzfs/zfs/issues/10764 Gladly correct me in case I'm wrong.
    comment by the-anarchist · 2023-04-18 · in PSA: Upgrade your LUKS key derivation function
  15. …the commit (as in [0]). [0]: https://lore.kernel.org/all/20221107170747.276910-1-broonie@... [1]: https://github.com/openzfs/zfs/issues/14555
    comment by imrehg · 2023-03-26 · in When root on ZFS breaks on Arch Linux
  16. I think you are referring to RAIDZ expansion, which isn't merged yet? https://github.com/openzfs/zfs/pull/12225
    comment by derkades · 2023-01-07 · in The Future of ZFS on Ubuntu Desktop Is Not Looking Good
  17. …give the compiler ways of optimizing C, it is not very good at generating good vector code: https://github.com/openzfs/zfs/pull/14234#issuecomment-13345... A bug report has been filed with GCC for one of the issues. LLVM is much better…
    comment by ryao · 2023-01-06 · in Transcoding Unicode with AVX-512: AMD Zen 4 vs. Intel Ice Lake
  18. You may be interested in recent (~the last month) developments in adding Windows support to OpenZFS: https://github.com/openzfs/zfs/pull/14034
    comment by infogulch · 2022-11-12 · in ZFSBootMenu – A boot loader to manage ZFS boot environments for Linux
  19. …that had to be worked around when the kernel team labelled those functions as GPL only. See: https://github.com/openzfs/zfs/issues/13042
    comment by wang_li · 2022-10-25 · in Rust in the Linux Kernel: Just the Beginning
  20. …loader) Note: This issue was specific to our use case and may not apply to all use cases... [1] https://github.com/openzfs/zfs/issues/12813 [2] https://zfsonlinux.topicbox.com/groups/zfs-discuss/T5122ffd3... [3]…
    comment by rtp4me · 2022-10-25 · in ZFS on Linux – ARC RAM compression can create up to 40% performance hit
  21. …running something based on 2.1 and still finding you can run it fuller more reasonably. [1] - https://github.com/openzfs/zfs/commit/aa755b35493a2d27dbbc59...
    comment by rincebrain · 2022-10-24 · in Maintaining sufficient free space with ZFS
  22. …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
  23. …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
  24. …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
  25. …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
  26. 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)
  27. 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
  28. …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
  29. …[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
  30. …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
  31. …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
  32. …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
  33. 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
  34. …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
  35. …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
  36. …[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
  37. 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
  38. …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
  39. 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
  40. …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
  41. …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
  42. …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
  43. …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
  44. …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)
  45. …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)
  46. …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
  47. …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
  48. …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
  49. …[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
  50. …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