Selfhosted

40648 readers

341 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.
No spam posting.
Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.
Don't duplicate the full text of your blog or github here. Just post the link for folks to click.
Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).
No trolling.

Resources:

selfh.st Newsletter and index of selfhosted software and apps
awesome-selfhosted software
awesome-sysadmin resources
Self-Hosted Podcast from Jupiter Broadcasting

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 2 years ago

MODERATORS

Tell me why I shouldn't use btrfs (lemmy.zip)

submitted 3 weeks ago by [email protected] to c/selfhosted

114 comments fedilink hide all child comments

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.

you are viewing a single comment's thread
view the rest of the comments

[–] [email protected] 8 points 3 weeks ago (13 children)

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.

[–] [email protected] -2 points 3 weeks ago* (last edited 3 weeks ago) (12 children)

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

Also the write will always be your bottleneck.

[–] stuner 2 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

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?

[–] [email protected] 1 points 3 weeks ago (1 children)

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

[–] stuner 2 points 3 weeks ago (1 children)

It's possible, but you should be able to see it quite easily. In my case, the CPU utilization was very low, so the same test should also not be CPU-bottlenecked on your system.

[–] [email protected] 0 points 3 weeks ago (1 children)

Is your machine part of a cluster by chance? Of so, when you do a VM transfer what performance do you see?

[–] stuner 1 points 3 weeks ago

Unfotunately, I can help you with that. The machine is not running any VMs.

load more comments (10 replies)