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usedby%The usedby properties decompose the used properties into the various reasons that space is used. Specifically, used = usedbysnapshots + usedbydataset + usedbychildren + usedbyrefreservation. These properties are only available for datasets cre...
usedbysnapshots%The amount of space consumed by snapshots of this dataset. In particular, it is the amount of space that would be freed if all of this dataset's snapshots were destroyed. Note that this is not simply the sum of the snapshots' used pro...
usedbydataset%The amount of space used by this dataset itself, which would be freed if the dataset were destroyed (after first removing any refreservation and destroying any necessary snapshots or descendents).
usedbychildren%The amount of space used by children of this dataset, which would be freed if all the dataset's children were destroyed.
usedbyrefreservation%The amount of space used by a refreservation set on this dataset, which would be freed if the refreservation was removed.
userrefs%This property is set to the number of user holds on this snapshot. User holds are set by using the "zfs hold" command.
volblocksize%For volumes, specifies the block size of the volume. The blocksize cannot be changed once the volume has been written, so it should be set at volume creation time. The default blocksize for volumes is 8 Kbytes. Any power of 2 from 512 by...
written%The amount of referenced space written to this dataset since the previous snapshot.
aclinherit%Controls how ACL entries are inherited when files and directories are created. A file system with an aclinherit property of discard does not inherit any ACL entries. A file system with an aclinherit property value of noallow only inherits ...
aclmode%Controls how an ACL is modified during chmod(2). A file system with an aclmode property of discard (the default) deletes all ACL entries that do not represent the mode of the file. An aclmode property of groupmask reduces permissions granted ...
atime%Controls whether the access time for files is updated when they are read. Turning this property off avoids producing write traffic when reading files and can result in significant performance gains, though it might confuse mailers and other sim...
canmount%If this property is set to off, the file system cannot be mounted, and is ignored by "zfs mount -a". Setting this property to off is similar to setting the mountpoint property to none, except that the dataset still has a normal mountpoint pr...
checksum%Controls the checksum used to verify data integrity. The default value is on, which automatically selects an appropriate algorithm (currently, fletcher4, but this may change in future releases). The value off disables integrity checking on u...
compression%Controls the compression algorithm used for this dataset. Setting compression to on indicates that the current default compression algorithm should be used. The default balances compression and decompression speed, with compression ratio ...
copies%Controls the number of copies of data stored for this dataset. These copies are in addition to any redundancy provided by the pool, for example, mirroring or RAID-Z. The copies are stored on different disks, if possible. The space used by mult...
dedup%Configures deduplication for a dataset. The default value is off. The default deduplication checksum is sha256 (this may change in the future). When dedup is enabled, the checksum defined here overrides the checksum property. Setting the value ...
exec%Controls whether processes can be executed from within this file system. The default value is on.
mlslabel%The mlslabel property is currently not supported on FreeBSD.
filesystem_limit%Limits the number of filesystems and volumes that can exist under this point in the dataset tree. The limit is not enforced if the user is allowed to change the limit. Setting a filesystem_limit on a descendent of a filesystem that a...
mountpoint%Controls the mount point used for this file system. See the "Mount Points" section for more information on how this property is used. When the mountpoint property is changed for a file system, the file system and any children that inherit ...
primarycache%Controls what is cached in the primary cache (ARC). If this property is set to all, then both user data and metadata is cached. If this property is set to none, then neither user data nor metadata is cached. If this property is set to me...