My only complaint with btrfs when I used to run it, is that kvm disk performance was abysmal on it. Otherwise I had no issues with the fs.
this post was submitted on 30 Jan 2024
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Most of the tools now should be setting nocow for virtual drives, performance these days isn't bad.
nodatacow is a hack and will disable any and all consistency mechanisms for that file's contents. Tools should not be setting nodatacow for virtual drives, certainly not by default.
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Many many years ago I set up btrfs for the disks I write my backups to with a raid 1 config for them. Unfortunately one of those disks went bad and ended up corrupting the whole array. Makes me wonder if I set it up correctly or not.
Nowadays, I have the following disks in my system set up as btrfs:
- My backups disk because of compression.
- My OS drive because of Timeshift.
- My home folder because it feels safer. COW feels like it'll handle power failures better, whilst there's also checksumming so I can identify corrupted files.
- My SSD Steam library over two drives because life is short and I cba managing the two ssds independently.
It's going fine, but it feels like I need to manually run a balance every one in a while when the disk fills up.
I also like btrfs-assistant for managing the devices.
Out of interest, since I've not used the "recommended partion setup" for any install for a while now, is ext4 still the default on most distros?
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Btrfs is good for small systems with 1-2 disks. ZFS is good for many disks and benefits heavily from ram. ZFS also has specially disks.
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