Is there any case where one would choose this over ext4 or even zfs?
If you need a robust, straightforward and fast filesystem - use xfs. If you need more advanced features - use btrfs or zfs. bcachefs should be an option for that at some point and unlike others it also aims to compete with xfs in speed.
When you want both Y2038 support and compatibility with slightly older kernels. AFAIK, the Y2038 support was added to XFS only very recently, while ext4 had it for much longer.
xfs integrates well into linux and has had excellent performance. zfs is rather odd as a filesystem and circumvents several common linux mechanisms, making it rather awkward. You need to special case everything for zfs in monitoring (sizes are hierarchical overlapping instead of exclusive), ACL support and admin tooling (volume management and partitioning is completely different for zfs, trim is weird, booting is weird). zfs performance is also lacking due to it being very odd and special-casey in the linux kernel, as well as RAM-hungry.
ext4 gives me questionable performance with writing a huge amount (like 50k+) of small files, but other than that its great.
the NFS client will issue the unlink() call, not hear anything back from the NFS server as it's blocking doing the unlink(), and then eventually time out and retry the operation. at which point the server immediately will return ENOENT as the is no visible file at that path.
the annoying thing is that this interaction leaks through into userland programs, and then to users, who see "no such file or directory" errors which cause great confusion. I've seen this multiple times in HPC environments.
On NVME? Not really.
GRIO (Guaranteed Rate IO) XFS support was added to IRIX due to a request by a US Gov't agency. This agency was doing electronic signal collection with IRIX on SGI HW, and wanted to a way to guarantee that whatever their sensors captured would be written to the storage media, no matter what else is going on at the OS level.
xfs is for when you have a big file system, maybe some some unusual loads but you want stability.
zfs is for when you want RAID and snapshots but are prepared to have it blow up every now and then.
First time I've heard that about ZFS, is that really a thing? It was made by Sun to be the ultimate industrial strength FS.
Me, I'm waiting for bcachefs - Linux native and carefully designed.
I've been hearing about this bcachefs for ages
Apologies to the ZFS people
> "professional Sysadmin"