About a year ago I switched to ZFS for Proxmox so that I wouldn’t be running technology preview.

Btrfs gave me no issues for years and I even replaced a dying disk with no issues. I use raid 1 for my Proxmox machines. Anyway I moved to ZFS and it has been a less that ideal experience. The separate kernel modules mean that I can’t downgrade the kernel plus the performance on my hardware is abysmal. I get only like 50-100mb/s vs the several hundred I would get with btrfs.

Any reason I shouldn’t go back to btrfs? There seems to be a community fear of btrfs eating data or having unexplainable errors. That is sad to hear as btrfs has had lots of time to mature in the last 8 years. I would never have considered it 5-6 years ago but now it seems like a solid choice.

Anyone else pondering or using btrfs? It seems like a solid choice.

0 points

Raid 5/6, only bcachefs will solve it

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0 points

Btrfs Raid 5 and raid 6 are unstable and dangerous

Bcachefs is cool but it is way to new and isn’t even part of the kernel as of yet.

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2 points
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https://en.wikipedia.org/wiki/Bcachefs it was added as of Linux 6.7

Edit: and I’ve said raid 5/6 as what troubles btrfs have so you proved my point while trying to explain to me that I’m not right

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0 points

I though was then removed later as there was a disagreement between Linus and the bcachefs dev

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0 points

btrfs raid subsystem hasn’t been fixed and is still buggy, and does weird shit on scrubs. But fill your boots, it’s your data.

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56 points

A bit of topic; am I the only one that pronounces it “butterface”?

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1 point

Similarly, I read bcachefs as BCA Chefs 😅

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61 points

Not anymore.

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37 points

You son of a bitch, I’m in.

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18 points

Ah feck. Not any more.

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2 points

I call it butter fuss. Yours is better.

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2 points

Related, and I cannot help but read “bcachefs” as “bitch café”

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6 points

Isn’t it meant to be like “better FS”? So you’re not too far off.

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1 point

I was meant to be Better FS, but it corrupted it to btrfs without noticing.

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10 points

i call it “butter FS”

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5 points

If it didn’t give you problems, go for it. I’ve run it for years and never had issues either.

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8 points

The question is how do you get a bad performance with ZFS?

I just tried to read a large file and it gave me uncached 280 MB/s from two mirrored HDDs.

The fourth run (obviously cached) gave me over 3.8 GB/s.

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-2 points
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I have never heard of anyone getting those speeds without dedicated high end hardware

Also the write will always be your bottleneck.

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4 points
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This is an old PC (Intel i7 3770K) with 2 HDDs (16 TB) attached to onboard SATA3 controller, 16 GB RAM and 1 SSD (120 GB). Nothing special. And it’s quite busy because it’s my home server with a VM and containers.

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5 points

I have similar speeds on a truenas that I installed on a simple i3 8100

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1 point

How much ram and what is the drive size?

I suspect this also could be an issue with SSDs. I have seen a lot a posts around describing similar performance on SSDs.

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2 points
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I’m seeing very similar speeds on my two-HDD RAID1. The computer has an AMD 8500G CPU but the load from ZFS is minimal. Reading / writing a 50GB /dev/urandom file (larger than the cache) gives me:

  • 169 MB/s write
  • 254 MB/s read

What’s your setup?

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1 point

Maybe I am CPU bottlenecked. I have a mix of i5-8500 and i7-6700k

The drives are a mix but I get almost the same performance across machines

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