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#zfs

1 post1 participant0 posts today
The Last Psion | Alex

OK, riddle me this, #Linux (specifically #ArchLinux) fans.

You can use #ZFS and #btrfs on root to create snapshots before updating the OS. But you can't snapshot EFI, because that's on a separate FAT32 partition.

So what happens if you run an update (pacman -Syu in this case) that includes a kernel update, and something goes wrong? The version of the kernel in the EFI partition will be newer than the modules in the snapshotted /usr/lib/modules. That's surely going to cause an issue, right?

From memory (it's been over 15 years), Gentoo can have multiple versions of the same kernel installed at once. But Arch only allows one version of any package at one time.

Jeff Moss

Anyone have any experience running #ZFS on Windows? It's been around a while and still under active development.

It feels not ready for production, but I'm looking for something to switch away from BTRFS on a NAS for long term storage, not highest performance.

github.com/openzfsonwindows/op

OpenZFS on Linux and FreeBSD. Contribute to openzfsonwindows/openzfs development by creating an account on GitHub.
GitHubGitHub - openzfsonwindows/openzfs: OpenZFS on Linux and FreeBSDOpenZFS on Linux and FreeBSD. Contribute to openzfsonwindows/openzfs development by creating an account on GitHub.
@doctator (0xDEADBEEF)

💾 ZFS ARC Cache Explained 💾

ZFS uses RAM as a powerful cache called the ARC (Adaptive Replacement Cache) to speed up disk reads and metadata operations.

It looks like ZFS “eats” RAM — but it’s actually putting your memory to work, caching data for blazing-fast access.

⚠️ Important: ARC is not a memory leak!
It dynamically adjusts — if apps need RAM, ARC frees it instantly.

🛠️ You can set a limit with zfs_arc_max so ZFS won’t take all your memory.

✅ Properly tuned, ARC boosts performance without starving your system.

So don’t fear the RAM usage—embrace the cache! 🚀

#ZFS#Sysadmin#Storage
@doctator (0xDEADBEEF)

"ZFS snapshots as poor man's ransomware recovery"

It holds up. Better than you'd think.

Ransomware hits a server? I roll back to a snapshot taken 10 minutes ago. Immutable, local, instant.

No restore wizard. No cloud latency. No vendor lock-in.

Just:

zfs rollback pool/dataset@safe

Gone. Like it never happened.

You want real ransomware defense?

🧊 Immutable local snapshots

📦 Offsite ZFS send/mirror

🔐 Key-based SSH, no password logins

🎯 Restore script you actually test

ZFS isn’t "enterprise." It’s survival-grade.

#ZFS#Ransomware#DisasterRecovery
Stefano Marinelli

Once again today, #FreeBSD and #ZFS 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.

Snapshots are one of the best inventions since sliced bread.

#RunBSD#OpenZFS
Csepp 🌢

First #selfHosting baby steps: bare metal server is finally up and running. :neofox_uwu:
Couldn't figure out remote unlocked encrypted root on #ZFS with #NixOS, but also I realized it would be overkill (what's the point of encrypting the Nix store?) and that I can selectively encrypt datasets, so it's whatevs.

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