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#openzfs

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OpenZFS<p>The 2025 <a href="https://mastodon.social/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> User and Developer Summit is rapidly approaching!</p><p>Please book your travel and register.</p><p>Developers should have received the CfP from Matt and please reach out if you have not.</p><p>User participation is discussed in the open on the Production User Calls every week.</p><p>See you there!</p><p><a href="https://openzfs.org/wiki/OpenZFS_Developer_Summit" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">openzfs.org/wiki/OpenZFS_Devel</span><span class="invisible">oper_Summit</span></a></p>
Kevin Karhan :verified:<p><span class="h-card" translate="no"><a href="https://udongein.xyz/users/lispi314" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>lispi314</span></a></span> <span class="h-card" translate="no"><a href="https://hachyderm.io/@hlangeveld" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>hlangeveld</span></a></span> <span class="h-card" translate="no"><a href="https://mastodon.social/@openzfs" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>openzfs</span></a></span> <span class="h-card" translate="no"><a href="https://wetdry.world/@memoria" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>memoria</span></a></span> Yes, but still folks in the <a href="https://infosec.space/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> community like <span class="h-card" translate="no"><a href="https://mastodon.social/@allanjude" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>allanjude</span></a></span> will recommended people to stay off <a href="https://infosec.space/tags/SMR" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SMR</span></a> in general until it's improved...</p>
Samuel Chase<p>For those of you have been programming for more than a decade, what programming languages, ecosystems, technologies do you wish you had spent more time with?</p><p>For me, it would be: <a href="https://fantastic.earth/tags/C" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>C</span></a>, <a href="https://fantastic.earth/tags/Perl" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Perl</span></a>, <a href="https://fantastic.earth/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a>, <a href="https://fantastic.earth/tags/TLA" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TLA</span></a>+, <a href="https://fantastic.earth/tags/ErlangOTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ErlangOTP</span></a> .</p><p>(I have spent some time with <a href="https://fantastic.earth/tags/commonlisp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>commonlisp</span></a>, <a href="https://fantastic.earth/tags/clojure" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clojure</span></a>, <a href="https://fantastic.earth/tags/java" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>java</span></a>, <a href="https://fantastic.earth/tags/rakulang" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rakulang</span></a> so these are not listed.)</p>
Shawn Webb<p>With the recent <a href="https://bsd.network/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> import into <a href="https://bsd.network/tags/FreeBSD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FreeBSD</span></a> main, Solaris-style named attributes are now supported. This means, for <a href="https://bsd.network/tags/ZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZFS</span></a> datasets configured for this new feature, developers would call <code>open(2)</code> to open the named attribute (aka, filesystem extended attribute) as a file descriptor. One can use normal syscalls like <code>read(2)</code>, <code>write(2)</code>, <code>lseek(2)</code>, etc. to interact with the attribute.</p><p>This provides a unique venue for stealthy code injection techniques. By combining Solaris-style named attributes with <code>fdlopen(3)</code>, attackers can inject shared objects that are difficult to inspect via normal methods.</p><p>We have mitigated this kind of technique in <a href="https://bsd.network/tags/HardenedBSD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HardenedBSD</span></a> by hardening the RTLD, teaching it to disallow any attempt to call <code>fdlopen(3)</code> on a named attribute file descriptor: <a href="https://git.hardenedbsd.org/hardenedbsd/HardenedBSD/-/commit/4fec880a91e389a5bf6d5849c2b27e0f31a7d3ed" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">git.hardenedbsd.org/hardenedbs</span><span class="invisible">d/HardenedBSD/-/commit/4fec880a91e389a5bf6d5849c2b27e0f31a7d3ed</span></a></p><p>The FreeBSD commit that introduced the plumbing for Solaris-style named attributes: <a href="https://git.hardenedbsd.org/hardenedbsd/HardenedBSD/-/commit/2ec2ba7e232dd126df0617194fd07be78c7a2ab9" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">git.hardenedbsd.org/hardenedbs</span><span class="invisible">d/HardenedBSD/-/commit/2ec2ba7e232dd126df0617194fd07be78c7a2ab9</span></a></p><p>The FreeBSD commit merging in the latest OpenZFS code with the Solaris-style named attribute feature implemented: <a href="https://git.hardenedbsd.org/hardenedbsd/HardenedBSD/-/commit/df58e8b1506f241670be86a560fb6e8432043aee" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">git.hardenedbsd.org/hardenedbs</span><span class="invisible">d/HardenedBSD/-/commit/df58e8b1506f241670be86a560fb6e8432043aee</span></a></p><p><a href="https://bsd.network/tags/infosec" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>infosec</span></a></p>
Neustradamus :xmpp: :linux:<p><a href="https://mastodon.social/tags/ProxmoxBackupServer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProxmoxBackupServer</span></a> 4.0 has been released (<a href="https://mastodon.social/tags/Proxmox" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Proxmox</span></a> / <a href="https://mastodon.social/tags/ProxmoxBS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProxmoxBS</span></a> / <a href="https://mastodon.social/tags/BackupServer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>BackupServer</span></a> / <a href="https://mastodon.social/tags/ZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZFS</span></a> / <a href="https://mastodon.social/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> / <a href="https://mastodon.social/tags/Linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Linux</span></a> / <a href="https://mastodon.social/tags/Debian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Debian</span></a> / <a href="https://mastodon.social/tags/Trixie" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Trixie</span></a> / <a href="https://mastodon.social/tags/DebianTrixie" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DebianTrixie</span></a>) <a href="https://proxmox.com/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">proxmox.com/</span><span class="invisible"></span></a></p>
Neustradamus :xmpp: :linux:<p><a href="https://mastodon.social/tags/ProxmoxVE" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProxmoxVE</span></a> 9.0 has been released (<a href="https://mastodon.social/tags/Proxmox" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Proxmox</span></a> / <a href="https://mastodon.social/tags/VirtualEnvironment" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VirtualEnvironment</span></a> / <a href="https://mastodon.social/tags/Virtualization" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Virtualization</span></a> / <a href="https://mastodon.social/tags/VirtualMachine" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VirtualMachine</span></a> / <a href="https://mastodon.social/tags/VM" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VM</span></a> / <a href="https://mastodon.social/tags/Linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Linux</span></a> / <a href="https://mastodon.social/tags/Debian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Debian</span></a> / <a href="https://mastodon.social/tags/Trixie" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Trixie</span></a> / <a href="https://mastodon.social/tags/DebianTrixie" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DebianTrixie</span></a> / <a href="https://mastodon.social/tags/QEMU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QEMU</span></a> / <a href="https://mastodon.social/tags/LXC" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>LXC</span></a> / <a href="https://mastodon.social/tags/KVM" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>KVM</span></a> / <a href="https://mastodon.social/tags/ZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZFS</span></a> / <a href="https://mastodon.social/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> / <a href="https://mastodon.social/tags/Ceph" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Ceph</span></a>) <a href="https://proxmox.com/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">proxmox.com/</span><span class="invisible"></span></a></p>
Michael Dexter<p>The recording of the July 31st, 2025 <a href="https://bsd.network/tags/bhyve" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>bhyve</span></a> Production User Call is up:</p><p><a href="https://youtu.be/B7DsDvx95dY" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="">youtu.be/B7DsDvx95dY</span><span class="invisible"></span></a></p><p>We discussed recent Production User Calls and upcoming events, Eurobhyvecon, Major CPU ID progress and reviews, paravirtualized clocks, <a href="https://bsd.network/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> replication with Zelta, devd events in <a href="https://bsd.network/tags/FreeBSD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FreeBSD</span></a> and their equivalents in <a href="https://bsd.network/tags/illumos" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>illumos</span></a>, VM metadata collection, and more!</p><p>"Don't forget to slam those Like and Subscribe buttons."</p>
Niels Roetert<p>Just copied 132GB from my old Synology NAS to my newly build <a href="https://mastodon.social/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> setup using rsync and just wanted to say I love this tool so much, works like a charm every time I need it.</p>
Niels Roetert<p>After many many years of usage my Synology NAS indicated that one of my 1.8TB HDD drives had a critical error and needed to be replaced, luckily I bought a spare drive with the unit which had been collecting dust all those years.</p><p>I was highly suspicious of the drive actually being faulty, so I put it in my Debian 13 workstation and started testing, one thing let to another and now it's configured in a <a href="https://mastodon.social/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> mirror and I also added a 128GB SSD I had laying around as a read cache, fun times.</p>
Neustradamus :xmpp: :linux:<p><a href="https://mastodon.social/tags/ProxmoxVE" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ProxmoxVE</span></a> 9.0 Beta 1 has been released (<a href="https://mastodon.social/tags/Proxmox" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Proxmox</span></a> / <a href="https://mastodon.social/tags/VirtualEnvironment" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VirtualEnvironment</span></a> / <a href="https://mastodon.social/tags/Virtualization" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Virtualization</span></a> / <a href="https://mastodon.social/tags/VirtualMachine" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VirtualMachine</span></a> / <a href="https://mastodon.social/tags/VM" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>VM</span></a> / <a href="https://mastodon.social/tags/Linux" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Linux</span></a> / <a href="https://mastodon.social/tags/Debian" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Debian</span></a> / <a href="https://mastodon.social/tags/Bookworm" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Bookworm</span></a> / <a href="https://mastodon.social/tags/DebianBookworm" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DebianBookworm</span></a> / <a href="https://mastodon.social/tags/QEMU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>QEMU</span></a> / <a href="https://mastodon.social/tags/LXC" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>LXC</span></a> / <a href="https://mastodon.social/tags/KVM" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>KVM</span></a> / <a href="https://mastodon.social/tags/ZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZFS</span></a> / <a href="https://mastodon.social/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> / <a href="https://mastodon.social/tags/Ceph" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Ceph</span></a>) <a href="https://proxmox.com/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">proxmox.com/</span><span class="invisible"></span></a></p>
Stephan Lichtenauer | נח סתו<p>I don't know if anybody noticed <a href="https://mastodon.africa/tags/ZeroFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZeroFS</span></a> yet, but it seems there is a completely user space-implementation of <a href="https://mastodon.africa/tags/NFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NFS</span></a> and <a href="https://mastodon.africa/tags/blockstorage" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>blockstorage</span></a> on top of <a href="https://mastodon.africa/tags/S3" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>S3</span></a> <a href="https://mastodon.africa/tags/objectstorage" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>objectstorage</span></a>: <a href="https://github.com/Barre/zerofs" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">github.com/Barre/zerofs</span><span class="invisible"></span></a></p><p>Including a demo running <a href="https://mastodon.africa/tags/ZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ZFS</span></a> on top of it which essentially allows geo-redundant ZFS volumes: <a href="https://asciinema.org/a/728234" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">asciinema.org/a/728234</span><span class="invisible"></span></a> &amp; <a href="https://github.com/Barre/zerofs?tab=readme-ov-file#geo-distributed-storage-with-zfs" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/Barre/zerofs?tab=re</span><span class="invisible">adme-ov-file#geo-distributed-storage-with-zfs</span></a></p><p>I don't see no <a href="https://mastodon.africa/tags/FreeBSD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FreeBSD</span></a> port yet, but if that really works it would be absolutely awesome.</p><p><a href="https://mastodon.africa/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a></p>
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>
Rob 💚<p>A few weeks ago I fixed a bug in <a href="https://social.lol/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> and I can't stop thinking about it.</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>
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>
Michael Dexter<p>The recording of the July 2nd, 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/yxQAk7I2-EI" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="">youtu.be/yxQAk7I2-EI</span><span class="invisible"></span></a></p><p>We discussed desired channel program features, an update to Gibran's VM configuration experiments, a suggestion that bectl allow for % range destroy syntax, and more!</p><p>"Don't forget to slam those Like and Subscribe buttons."</p>
Michael Dexter<p>The recording of the June 25th, 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/qQF2QkPfBko" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="">youtu.be/qQF2QkPfBko</span><span class="invisible"></span></a></p><p>We discussed ZFS on ZFS virtual machine block size alignment and caching, User and Developer Summit wish list items, including channel program features, illumos OpenZFS, libzfs, Samba VSS, flexible zpool history logging, FreeBSD NFSd auditing, a manual page proposal, and more!</p><p>"Don't forget to slam those Like and Subscribe buttons."</p>
Rob 💚<p>Well that was an unexpected way to spend nine hours.</p><p><a href="https://github.com/openzfs/zfs/pull/17488" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/openzfs/zfs/pull/17</span><span class="invisible">488</span></a></p><p><a href="https://social.lol/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a></p>
Michael Dexter<p>Would you be willing to throw a few $currency into an <a href="https://bsd.network/tags/illumos" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>illumos</span></a> <a href="https://bsd.network/tags/OpenZFS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OpenZFS</span></a> import?</p><p><a href="https://bsd.network/tags/FullCircle" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FullCircle</span></a></p>
Michael Dexter<p>The recording of the June 18th, 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/I-aojFsVF1c" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="">youtu.be/I-aojFsVF1c</span><span class="invisible"></span></a></p><p>We discussed the OpenZFS User and Developer Summit and brainstormed topics for it including libzfs_core, desktop integration, auditing, and more!</p><p>"Don't forget to slam those Like and Subscribe buttons."</p>