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Best Filesystem for NAS? (self.selfhosted)

submitted 10 months ago* (last edited 10 months ago) by Trincapinones to c/selfhosted

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A year ago I set up Ubuntu server with 3 ZFS pools on my server, normally I don't make copies of very large files but today I was making a copy of a ~30GB directory and I saw in rsync that the transfer doesn't exceed 3mb/s (cp is also very slow).

What is the best file system that "just works"? I'm thinking of migrating everything to ext4

EDIT: I really like the automatic pool recovery feature in ZFS, has saved me from 1 hard drive failure so far

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[–] [email protected] 3 points 10 months ago (1 children)

Ext4 does not have CoW.

That's the only true part of this comment.

As for everything else:

Ext4 uses journaling to ensure consistency.

btrfs' CoW makes it resistant to that issue by its nature; writes go elsewhere anyways, so you can delay the "commit" until everything is truly written and only then update the metadata (using a similar scheme again).

Please read https://en.wikipedia.org/wiki/Journaling_file_system.

[–] Eideen 1 points 10 months ago (1 children)

BTRFS is currently not Journaling

https://lore.kernel.org/linux-btrfs/[email protected]/T/#m46f1e018485e6cb2ed42602defee5963ed8c2789

Qu Wenruo did a write up on some of the edge cases. Partial write being one of them.

[–] [email protected] 2 points 10 months ago

What you just posted concerns the experimental RAID5/6 mode which, unlike all other block group modes, did not have CoW's inherent safety.

As it stands, there is no stable RAID5/6 support in btrfs. If we're talking about non-experimental usage of btrfs, it is irrelevant.