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#openzfs

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Stefano Marinelli<p>Once again today, <a href="https://mastodon.bsd.cafe/tags/FreeBSD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FreeBSD</span></a> and <a href="https://mastodon.bsd.cafe/tags/ZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZFS</span></a> saved a setup. Suddenly, a colleague realized that a database was acting up - probably some massive operation had deleted something. The machine takes snapshots every 15 minutes and keeps them for a few hours, then one a day and keeps those for days. To make a long story short, the July 4th dump still had the correct data. To get there, we just had to clone all the snapshots (going back day by day) and test them.</p><p>Snapshots are one of the best inventions since sliced bread.</p><p><a href="https://mastodon.bsd.cafe/tags/RunBSD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RunBSD</span></a> <a href="https://mastodon.bsd.cafe/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a></p>
jbz<p>An (almost) catastrophic OpenZFS bug and the humans that made it (and Rust is here too) • Rob Norris</p><p><a href="https://despairlabs.com/blog/posts/2025-07-10-an-openzfs-bug-and-the-humans-that-made-it/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">despairlabs.com/blog/posts/202</span><span class="invisible">5-07-10-an-openzfs-bug-and-the-humans-that-made-it/</span></a></p><p><a href="https://indieweb.social/tags/openzfs" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>openzfs</span></a> <a href="https://indieweb.social/tags/rust" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rust</span></a> <a href="https://indieweb.social/tags/opensource" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>opensource</span></a></p>
Michael Dexter<p>The recording of the July 9th, 2025 <a href="https://bsd.network/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> Production User Call is up:</p><p><a href="https://youtu.be/qgMHPsqP86Y" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="">youtu.be/qgMHPsqP86Y</span><span class="invisible"></span></a></p><p>We discussed pam_zfs_keys and encrypted home directories, a recent FreeBSD multipathing discussion, configuration of a new system, DRAID, arbitrary RAIDZ, and more!</p><p>"Don't forget to slam those Like and Subscribe buttons."</p>
Graham Perrin<p>Kubuntu shutting down gracefully – without forcing off the computer – following an insane zpool-scrub(8) command: </p><p><a href="https://github.com/openzfs/zfs/issues/14481#issuecomment-3053530299" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/openzfs/zfs/issues/</span><span class="invisible">14481#issuecomment-3053530299</span></a></p><p><a href="https://mastodon.bsd.cafe/tags/Kubuntu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Kubuntu</span></a> <a href="https://mastodon.bsd.cafe/tags/Ubuntu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Ubuntu</span></a> <a href="https://mastodon.bsd.cafe/tags/Debian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Debian</span></a> <a href="https://mastodon.bsd.cafe/tags/ZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZFS</span></a> <a href="https://mastodon.bsd.cafe/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> <a href="https://mastodon.bsd.cafe/tags/zpool" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>zpool</span></a> <a href="https://mastodon.bsd.cafe/tags/scrub" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>scrub</span></a></p>
Graham Perrin<p>I switched to Kubuntu with root-on-ZFS: </p><p>― <a href="https://www.reddit.com/r/freebsd/comments/1lr4ayi/switched/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">reddit.com/r/freebsd/comments/</span><span class="invisible">1lr4ayi/switched/</span></a></p><p>FreeBSD is not entirely abandoned: </p><p>― <a href="https://www.reddit.com/r/freebsd/comments/1lr4ayi/comment/n1cnfy2/?context=1" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">reddit.com/r/freebsd/comments/</span><span class="invisible">1lr4ayi/comment/n1cnfy2/?context=1</span></a></p><p>Pinned (seeking guidance): </p><p>― <a href="https://mastodon.bsd.cafe/@grahamperrin/114640816892663471" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">mastodon.bsd.cafe/@grahamperri</span><span class="invisible">n/114640816892663471</span></a></p><p><a href="https://mastodon.bsd.cafe/tags/FreeBSD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FreeBSD</span></a> <a href="https://mastodon.bsd.cafe/tags/Linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Linux</span></a> <a href="https://mastodon.bsd.cafe/tags/KDE" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>KDE</span></a> <a href="https://mastodon.bsd.cafe/tags/Plasma" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Plasma</span></a> <a href="https://mastodon.bsd.cafe/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> <a href="https://mastodon.bsd.cafe/tags/ZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZFS</span></a> <a href="https://mastodon.bsd.cafe/tags/bemgr" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>bemgr</span></a> <a href="https://mastodon.bsd.cafe/tags/zectl" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>zectl</span></a> <a href="https://mastodon.bsd.cafe/tags/ZFSBootMenu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZFSBootMenu</span></a></p>

Hot on the heels of last week's 2.2 update, here's #OpenZFS 2.3.3. Lots of fixes and updates, including:

- encryption+replication panic fixes
- support for Linux 6.15 and RHEL/CentOS/Alma 10
- multithreaded ARC eviction
- more responsive dbuf cache eviction
- improved dedup efficiency for embedded and zero blocks
- syncfs() (Linux) and msync() (FreeBSD) correctness fixes
- disk/by-vdev symlinks for multipath partitions

Enjoy, and remember to tip your programmers! 💸

github.com/openzfs/zfs/release

GitHubRelease zfs-2.3.3 · openzfs/zfsSupported Platforms Linux: compatible with 4.18 - 6.15 kernels FreeBSD: compatible with releases starting from 13.3+, 14.0+ Changes Tag zfs-2.3.3 Linux 6.15 compat: META #17393 Fix mixed-use-of-...
Replied in thread

@paul @linus @stefano @whynothugo I chose Ubuntu (for KDE Plasma) because the installer provides root-on-ZFS.

With that base, I have not yet figured out which of these will be the simplest way forward:

― bemgr
― zectl
― ZFSBootMenu.

<gist.github.com/grahamperrin/a>

I see verbose guides, the verbosity creates a sense of complication.

I'd like the simplest possible guide to getting started, with any of the three options, where the boot environment layout/structure is predetermined by the installer for Ubuntu.

TIA

GistFreeBSD, GhostBSD, NomadBSD, Ubuntu, Kubuntu, KDE PlasmaFreeBSD, GhostBSD, NomadBSD, Ubuntu, Kubuntu, KDE Plasma - somesystems.md

The recording of the June 4th, 2025 #OpenZFS Production User Call is up:

youtu.be/xdIDdGFc2Jc

We discussed upcoming events, using ZFS to provide transactional behavior to a legacy application, copy_file_range/block cloning, the /%recv receiving snapshot, 2025 User and Developer Summit topics including libzfs, nvlist, channel programs, and more!

"Don't forget to slam those Like and Subscribe buttons."

rsync -avhHPx --delete source/dir destdir/

Me: Oh no! The correct source was source/ - not source/dir - and now all of destdir's contents (4.6 TB) have been deleted!
Me, two seconds later: Oh well. `zfs rollback datapool/dataset@lastSnap`

rsync -avhHPx --delete source/ destdir/

Thank you, ZFS.

One of the downsides of the kind of work/life schedule I have is the difficulty of committing to fixed or pre-scheduled times. For example, I still haven’t managed to join any of @dexter ’s fantastic calls - shame on me!
I occasionally get to watch the recordings, and they’re always full of interesting insights.

It’s the same reason why I often couldn’t make it to the BSDPub meetups organized by @gyptazy - anche they were great, relaxing and inspiring.

If you can, I strongly encourage you to take part!

#CallForTesting #bhyve #openzfs #zfs #RunBSD BSDPub

Take your FreeBSD ZFS game to the next level! 🔧💾

In our latest blog, Benedict Reuschling dives into automated ZFS snapshots with Sanoid — a powerful tool to schedule, manage, and prune snapshots effortlessly on FreeBSD. Learn how to set up snapshot policies to keep your data safe.

📦 Bonus: Includes a ready-to-go Ansible playbook!

👉 Read now: freebsdfoundation.org/blog/zfs
#FreeBSD #ZFS #OpenZFS #SysAdmin #Sanoid #Snapshots #DataRecovery #Ansible

Ok so, when #FreeBSD switched #ZFS to #OpenZFS in 13.0, a lot of sysctl knobs got new names, and the old ones retained as aliases. I now want to get rid of them, but I don't know how deep they go in code, tools, documentation and oral histories.

Since I'm here for code cleanup and not to ruin anyone's day, I could use an assist from old FreeBSD+ZFS boffins. Please review github.com/openzfs/zfs/pull/17 and let me know if there are any that would be bad to remove, and why. Thank you!

GitHubtunables: remove legacy FreeBSD aliases by robn · Pull Request #17375 · openzfs/zfsBy robn

PSA: In case you run #Ubuntu 24.10 with #ZFS on Root, DO NOT TRY TO UPGRADE YET! You are very likely to run into a #Linux kernel deadlock mid-flight during the upgrade which leaves you with a broken system.

Also: Use zfs snapshot before trying to upgrade. zfs-auto-snapshot to the rescue! #openzfs #linuxmint

github.com/openzfs/zfs/issues/

GitHubSystem deadlock during Ubuntu upgrade 24.10→25.04 with ZFS root due to update-grub calling `ls /.zfs/snapshot/…` via `10_linux_zfs` causing kernel lock at mount.zfs · Issue #17337 · openzfs/zfsBy bentolor