Some points I think bear some clarification wrt current zfs state: - current versions of zfs (ie: openzfs) error (unless forced) when adding non-redundant devi

Some points I think bear some clarification wrt current zfs state: - current versions of zfs (ie: openzfs) error (unless forced) when adding non-redundant devices to a redundant pool, and have device removal to handle the case where someone bypasses the error. - pools can grow in zfs (ie: the things one allocates storage out of). what is probably being referenced here is that one can't reshape a zraid vdev to add more disks to it (basically the reshape operation in classic raid setups). This does make expanding in some cases less flexible that old-style raid setups. Also, I really have to agree that ARC behavior is still not great under load, and I don't think that's that much of an edge case.