2012/4/25 Richard Elling <richard.ell...@gmail.com>: > On Apr 25, 2012, at 8:14 AM, Eric Schrock wrote: > > ZFS will always track per-user usage information even in the absence of > quotas. See the the zfs 'userused@' properties and 'zfs userspace' command. > > > tip: zfs get -H -o value -p userused@username filesystem > > Yes, and this is the logical size, not physical size. Some ZFS features > increase logical size > (copies) while others decrease physical size (compression, dedup)
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[*]). --matt [*] 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 datasets. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
