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submitted 1 week ago by Samsy@lemmy.ml to c/linuxmemes@lemmy.world
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[-] one_knight_scripting@lemmy.world 4 points 1 week ago* (last edited 1 week ago)

Try Root on ZFS.

If you run into an issue suddenly, you can restore to snapshot.

[-] Anti_Iridium@lemmy.world 1 points 1 week ago
[-] hersh@literature.cafe 1 points 1 week ago

Good advice!

This is also available with BTRFS. Personally I am leveraging this feature via Snapper, simply because it was the default on OpenSuse and was good enough that I never bothered looking into alternatives. I've heard good things about Timeshift, too.

This has saved my butt a couple times. I'll never go back to a filesystem that doesn't support snapshots.

I really liked ZFS when I used it many years ago, but eventually I decided to move to BTRFS since it has built-in kernel support. I miss RAIDZ, though. :(

[-] one_knight_scripting@lemmy.world 2 points 1 week ago* (last edited 1 week ago)

BTRFS is a damn good option too. I'm happy to hear how easy it is to use. I haven't used it(yet), I went with ZFS because of its flexible architecture. On a desktop level, BTRFS makes sense, but in a server? What is it like in a Hypervisor?

I'm working on standing up a Cloudstack host as a Hypervisor. Now, I want this host to be able to run 5 kubernetes VMs, so it needs to have quick access to the disks. Now, I do not have a RAID card, only an HBA. In such a scenario, I would typically use a RAID 10. But a ZFS Raid 10 outperforms an mdraid 10 anyways (in terms of writing, not necessarily reading). So that is what I've decided. It may not be a good idea, it may not even be feasible. But I'm heckin willing to give it a shot.

I'm actually jealous that you automatically have built in kernel support though. I am a little curious about BTRFS in terms of how(or if) it connects multiple disks, I'm simply uninformed.

ZFS Performance Sauce

Install Ubuntu 24.04 on ZFS RAID 10 - Github Repository

Edit: There are a few drawdowns to using ZFS, lousy docker performance being one that I've heard about. I'm curious how this will be affected if I have docker running inside a VM.

[-] hersh@literature.cafe 2 points 1 week ago* (last edited 1 week ago)

BTRFS can work across multiple disks much like ZFS. It supports RAID 0/1/10 but I can't tell you about performance relative to ZFS.

Just be sure you do NOT use BTRFS's RAID5/6. It's notoriously buggy and even the official docs warn that it is only for testing/development purposes. See https://btrfs.readthedocs.io/en/latest/btrfs-man5.html#raid56-status-and-recommended-practices

Edit: Another interesting thing to note between the two file systems is deduplication. ZFS supports automatic deduplication (although it requires a lot of memory). BTRFS supports deduplication but does not have built-in automatic dedup. You can use external tools to perform either file-level or block-level deduplication on BTRFS volumes: https://btrfs.readthedocs.io/en/latest/Deduplication.html

Thanks for the insight!

I may have to resort to using BTRFS for this host eventually if ZFS fails me. I do not expect a lot of duplication on a host, even if I have it, who cares I have 60 TB despite the raid 10 architecture. Having something with kernel support may be a better approach anyways.

It's interesting to me that it struggles with raid 5 and 6 though. I would have expected that to be easy to provide.

this post was submitted on 15 Dec 2024
169 points (73.9% liked)

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