>The size accounted for by the userused@ and groupused@ properties is the
>"referenced" space, which is used as the basis for many other space
>accounting values in ZFS (e.g. "du" / "ls -s" / stat(2), and the zfs accounting
>properties "referenced", "refquota", "refreservation", "refcompressratio",
>"written"). It includes changes local to the dataset (compression, the
>"copies" property, file-specific metadata such as indirect blocks), but ignores
>pool-wide or cross-dataset changes (space shared between a clone and its
>origin, mirroring, raid-z, dedup[*]).
>[*] Although dedup can be turned on and off per-dataset, the data is
>deduplicated against all dedup-enabled data in the pool. Ie, identical data in
>different datasets will be stored only once, if dedup is enabled for both
Can we also get the *ignored* space accounted?
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