What Filesystem?
What filesystem is currently best for a single nvme drive with regard to performance read/write as well as stability/no file loss? ext4 seems very old, btrfs is used by RHEL, ZFS seems to be quite good... what do people tend to use nowadays? What is an arch users go-to filesystem?
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It depends, for a normal user? Ext4, maybe btrfs because in terms of stability is the best {but u lose some functions like the ability to make a swap file, wich today isn't really that useful, but u lose the ability to make one). Want something really fast fort large files? ZFS, but if u experience an energy loss it could be really catastrophic.
Ext in general is so good that even to this day android it's still using EXT2, 2!
You can make a swap file on btrfs.
First of all, thanks this r news for me. But I don't think is a good idea to use the swap file in btrfs.
It is supported since kernel 5.0
There are some limitations of the implementation in BTRFS and Linux swap subsystem:
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filesystem - must be only single device
filesystem - must have only single data profile
subvolume - cannot be snapshotted if it contains any active swapfiles
swapfile - must be preallocated (i.e. no holes)
swapfile - must be NODATACOW (i.e. also NODATASUM, no compression)
With active swapfiles, the following whole-filesystem operations will skip swapfile extents or may fail:
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balance - block groups with extents of any active swapfiles are skipped and reported, the rest will be processed normally
resize grow - unaffected
resize shrink - works as long as the extents of any active swapfiles are outside of the shrunk range
device add - if the new devices do not interfere with any already active swapfiles this operation will work, though no new swapfile can be activated afterwards
device delete - if the device has been added as above, it can be also deleted
device replace - ditto
Yes, there are some limitations to be aware of, with how it interacts with certain features. But EXT4 doesn't have any of those features at all. It doesn't have CoW, or balance, or multi-device, or snapshots.
If the filesystem, is single-device, and you have the swapfile on it's own nocow subvolume, preallocate the swapfile, and don't try to take snapshots of it, it should be fine.