Copilotに質問投げてみた
IBMや赤帽の回し者の記事が、どの程度影響しているかは知らない
RHELの既定がXFSだったようなうろ覚え

XFS: Known for its high performance, especially with large files, XFS is a solid choice for RAID arrays. It’s reliable and scales well, but it lacks some of the advanced features of ZFS, like built-in redundancy.

EXT4: A versatile and widely supported filesystem, EXT4 is stable and performs well in most scenarios. While it doesn’t have the advanced features of ZFS, it’s a good choice for general-purpose use and is less resource-intensive.

Btrfs: While Btrfs has features like snapshots and compression, its RAID5/6 implementation is still considered less reliable compared to ZFS. It’s better suited for other RAID levels or single-disk setups.