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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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Seeking guidance on BTRFS RAID (lemmy.ml)

submitted 1 day ago by GnuLinuxDude@lemmy.ml to c/linux@lemmy.ml

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I'm installing 3x2TB HDDs into my desktop pc. The drives are like-new.

Basically they will replace an ancient 2tb drive that is failing. The primary purpose will basically be data storage, media, torrents, and some games installed. Losing the drives to failure would not be catastrophic, just annoying.

So now I'm faced with how to set up these drives. I think I'd like to do a RAID to present the drives as one big volume. Here are my thoughts, and hopefully someone can help me make the right choice:

RAID0: Would have been fine with the risk with 2 drives, but 3 drives seems like it's tempting fate. But it might be fine, anyhow.
RAID1: Lose half the capacity, but pretty braindead setup. Left wondering why pick this over RAID10?
RAID10: Lose half the capacity... left wondering why pick this over RAID1?
RAID5: Write hole problem in event of sudden shutoff, but I'm not running a data center that needs high reliability. I should probably buy a UPS to mitigate power outages, anyway. Would the parity calculation and all that stuff make this option slow?

I've also rejected considering things like ZFS or mdadm, because I don't want to complicate my setup. Straight btrfs is straightforward.

I found this page where the person basically analyzed the performance of different RAID levels, but not with BTRFS. https://larryjordan.com/articles/real-world-speed-tests-for-different-hdd-raid-levels/ (PDF link with harder numbers in the post). So I'm not even sure if his analysis is at all helpful to me.

If anyone has thoughts on what RAID level is appropriate given my use-case, I'd love to hear it! Particularly if anyone knows about RAID1 vs RAID10 on btrfs.

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[–] nemo24601@lemmy.ml 1 points 16 hours ago

Zfs has built-in encryption that can be enabled selectively per dataset, which is handy for some private data.

Also, as long as you avoid raidz, you can now add/remove disks to a pool, and attach/detach mirrors too. That's much more flexible than it used to be.

Too bad raid1 from btrfs has not a zfs equivalent. You can to some extent replicate that via partitioning in zfs, but the simplicity of btrfs raid1 is great for uneven disks.

Has btrfs got its act together with large amounts of snapshots? It used to be a pain point.