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It looks like ZFS also suffers(ed?) the same problem: https://zfs-discuss.opensolaris.narkive.com/BQ7RMcjo/cannot-delete-file-when-fs-100-full https://zfs-disc

• jclulow 3y ago
  Yes, ZFS has the same fundamental issue that all COW file systems have here. We have a reserved pool of space that you can't use except for operations like removing stuff. The new problem with that reserved pool mechanism is that in 2024 it's probably way too big, because it's essentially a small but fixed percentage of the storage size. Don't let people use thresholds of total size without some kind of absolute cap!