On Tue, Dec 21, 2021 at 06:26:03PM +0100, Ricardo Wurmus wrote: > We could take this opportunity to reformat /gnu with btrfs, which > performs quite a bit more poorly than ext4 but would be immune to > defragmentation. It’s not clear that defragmentation matters here. It > could just be that the problem is exclusively caused by having these > incredibly large, flat /gnu/store, /gnu/store/.links, and > /gnu/store/trash directories. My impression was that btrfs could also become fragmented. At least, btrfs-progrs includes a command for defragmenting. Or do I misunderstand?