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Best Filesystem for NAS?
(lemmy.world)
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this post was submitted on 05 Feb 2024
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Yes both BTRFS and Ext4 are vulnerable to unplanned powerloss when writes are in flight. Commonly knows as a write hole.
For BTRFS since it use of Copy of Write, it is more vulnerable. As metadata needs to be updated and more. 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.
BTRFS is currently not Journaling
https://lore.kernel.org/linux-btrfs/20220513113826.GV18596@twin.jikos.cz/T/#m46f1e018485e6cb2ed42602defee5963ed8c2789
Qu Wenruo did a write up on some of the edge cases. Partial write being one of them.
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.
This is where theory and practice diverge and I bet a lot of people here will essentially have the same experience I have. I will never run an Ext filesystem again, not ever as I got burned multiple times both at home/homelab and at the datacenter with Ext shenanigans. BTRFS, ZFS, XFS all far superior and more reliable.
I run BTRFS my self.
And I agree BTRFS , is superior.