oshogbo2h ago

I spent a whole blog post doing #ZFS on-disk math by hand - just to corrupt one byte and watch #OpenZFS healing process.

Interested?

Feel free to join the journey into the on-disk jungle.

https://oshogbo.com/blog/90/

#storage #FreeBSD #Linux #Storage #Filesystem

Corrupting a ZFS File on Purpose

Most of the time, the whole point of ZFS is that your data does not get corrupted. But during development you sometimes need the opposite: a controlled, reproducible corruption, so you can watch self-healing kick in, see what a scrub reports, or just understand how a file maps onto the physical disk. There is no better exercise than breaking one byte on purpose and seeing ZFS notice.

oshogbo//vx
Show threadax67616d ago

(removed larger list of accounts not related to this subthread)

@TurboTrain Well 😒 ...

"Oh, No! Not #OpenZFS?!"

"Et tu, OpenZFS?"

"Slop comes for every project."

@[email protected] With https://mastodon.social/@bms48/116662724883486066 in consideration, you are now moving goal posts, or accepting the increasing use bit by bit -- pick as suitable.

#whatHaveYouSloppedLately?🤨

oshogboMay 28

One ZAP entry. One uint64_t in spa_t. One new CLI flag.

That's all it took to teach #OpenZFS to skip blocks the last scrub already verified.

`zpool scrub -C` ships in 2.4.0.

https://oshogbo.com/blog/89/

#FreeBSD #Linux #sysadmin #devops #storage

Don't Make ZFS Re-Read What It Just Read

I have already mentioned one of my improvements to scrub in an earlier post, Teaching ZFS about time. In that post I also claimed that scrub can be expensive, and that we were looking for ways to limit the amount of data we actually want to scrub. A scrub on a multi-petabyte pool can run for days, and some of us want a smaller, easier check that everything is still going right.

Neustradamus :xmpp: :linux:May 28
#ProxmoxDatacenterManager 1.1 has been released ( #Proxmox / #ProxmoxDM / #ZFS / #OpenZFS / #Linux / #Debian / #Trixie / #DebianTrixie ) https://proxmox.com/
Proxmox Server Solutions

Proxmox develops powerful and efficient open-source server solutions like the Proxmox VE platform, Proxmox Backup Server, and Proxmox Mail Gateway.

Proxmox
oxy ::openbsd:: ::freebsd:: ::runbsd:: May 26
I do enjoy how I can beat the hell out of a FreeBSD box and it just takes it without flinching

#FreeBSD #OpenZFS #ZFS
Michael DexterMay 22

My grant application to work on #OpenZFS and #FreeBSD/#ARM64 documentation has been waitlisted.

Might any patrons want to support this work?

Neustradamus :xmpp: :linux:May 21
#ProxmoxVE 9.2 has been released ( #Proxmox / #VirtualEnvironment / #Virtualization / #VirtualMachine / #VM / #Linux / #Debian / #Trixie / #DebianTrixie / #QEMU / #LXC / #KVM / #ZFS / #OpenZFS / #Ceph ) https://proxmox.com/
Proxmox Server Solutions

Proxmox develops powerful and efficient open-source server solutions like the Proxmox VE platform, Proxmox Backup Server, and Proxmox Mail Gateway.

Proxmox
Graham PerrinMay 21

ZFS SAUSAGE

#FreeBSD #OpenZFS #NAS #MissingConsonants

Michael DexterMay 21

The recording of the May 20th, 2026 #OpenZFS Production User Call is up:

https://youtu.be/Mhu9WllvEes

We discussed Rob Norris' extensive refactoring of the OpenZFS ZAP code with related testing infrastructure, eZFS2A multi-factor authentication for encrypted datasets, ZFSObjectIdToPath, OpenZFS on Windows support for VSS and Hyper-V, a scale-out architecture, and more!

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

You can support all Call For Testing efforts via BSD Fund: https://bsdfund.org

2026-05-20 OpenZFS Production User Call

YouTube
Show threadax6761May 20

@robn *ugh* Personally prefer to have "readonly=on" to supersede read-write option of "{zfs-,}mount" commands.

Issue 18557 is really not an issue. "Affected" people ought to not-do-that-if-it-hurts. (Actually, same could be said of my preference (that I ought to not use "{zfs-,}mount" with read-write option on a dataset with "readonly=on" property).)

Anyway, what good is "readonly" property (set to "on") then if it is easily overridden.

#OpenZFS #ZFS