Btrfs (B-TRee FileSystem). Lee_Lammert hopes to cover 2 parts, both "100 & 200" which will lead to his future presentation of btrfs 500 at a future date,
btrfs 100 → Intro / Fundamentals (for general Linux admins)
btrfs 200 → Intermediate / Practical Ops (for sysadmins using Snapper, subvolumes, RAID)
These will prepare you for the "btrfs 500" that will be upcoming at a future mtng in a week or a month.
btrfs 500 → Deep Internals / Engineering Analysis (for kernel-savvy, filesystem experts)

Btrfs (B-TRee FileSystem) is a modern, copy-on-write (COW) file system for Linux that focuses on fault tolerance, easy administration, and advanced features like snapshots, built-in volume management, data checksums for self-healing, and transparent data compression.

It supports multiple disks and RAID 0, 1, 10 configurations, and includes features like online resizing and defragmentation.

Key features:

*

Copy-on-Write (COW):
*
Snapshots:
*
Self-healing:
*
Volume management:
*
Data compression:

=≠=≠=≠=≠≠≠====≠=========================
THE ABOVE MAIN talk starts at ~7:15pm CDT Wed 10 Dec 2025. Thats
MAIN Topic: "btrfs" File System by Lee_Lammert.

It is immediately preceded by
~7:00pm cdt Announcements

All is preceded by the below tutorial starting at
6:30pm cdt.
BASIC Tutorial: What is a Router / Firewall? by Grant Taylor
What are they? Why do you need/want them? Can I just take a Linux box and turn it into a router/firewall? Or should I buy one new off the shelf? Where does it go in your network?

For Zoom Link info, go to:

# www.sluug.org/next

Our usual format is"
6:30pm
BASE turorial

~7:00pm Announcements & general Q&A

~7:15pm
MAIN:

The URL link to instructions at the www.sluug.org home page, are posted the day prior to this remote ZOOM meeting. The "next" link is called "linked here". You may have to refresh your browser after each time you check.

ONLINE MEETINGS ONLY until further notice.
ONLINE session will use remote video software.
CONNECTION instructions will be on the www.sluug.org web page and our mailing lists. Note that your browser cache may need to be refreshed each time you check the above web page for the instructions. We will open the remote session at about 6:00 PM, so that you can join early to test your microphone, screen and video sharing.

Details will be published on https://www.sluug.org/ when available.