petros@newton:~$ sudo zpool list
NAME        SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
datastore  1.81T   112K  1.81T         -     0%     0%  1.00x  ONLINE  -
petros@newton:~$ sudo zfs list -0 space
invalid option '0'
usage:
	list [-Hp] [-r|-d max] [-o property[,...]] [-s property]...
	    [-S property]... [-t type[,...]] [filesystem|volume|snapshot] ...

The following properties are supported:

	PROPERTY       EDIT  INHERIT   VALUES

	available        NO       NO   <size>
	clones           NO       NO   <dataset>[,...]
	compressratio    NO       NO   <1.00x or higher if compressed>
	creation         NO       NO   <date>
	defer_destroy    NO       NO   yes | no
	logicalreferenced  NO       NO   <size>
	logicalused      NO       NO   <size>
	mounted          NO       NO   yes | no
	origin           NO       NO   <snapshot>
	refcompressratio  NO       NO   <1.00x or higher if compressed>
	referenced       NO       NO   <size>
	type             NO       NO   filesystem | volume | snapshot | bookmark
	used             NO       NO   <size>
	usedbychildren   NO       NO   <size>
	usedbydataset    NO       NO   <size>
	usedbyrefreservation  NO       NO   <size>
	usedbysnapshots  NO       NO   <size>
	userrefs         NO       NO   <count>
	written          NO       NO   <size>
	aclinherit      YES      YES   discard | noallow | restricted | passthrough | passthrough-x
	acltype         YES      YES   noacl | posixacl
	atime           YES      YES   on | off
	canmount        YES       NO   on | off | noauto
	casesensitivity  NO      YES   sensitive | insensitive | mixed
	checksum        YES      YES   on | off | fletcher2 | fletcher4 | sha256
	compression     YES      YES   on | off | lzjb | gzip | gzip-[1-9] | zle | lz4
	context         YES       NO   <selinux context>
	copies          YES      YES   1 | 2 | 3
	dedup           YES      YES   on | off | verify | sha256[,verify]
	defcontext      YES       NO   <selinux defcontext>
	devices         YES      YES   on | off
	exec            YES      YES   on | off
	filesystem_count YES       NO   <count>
	filesystem_limit YES       NO   <count> | none
	fscontext       YES       NO   <selinux fscontext>
	logbias         YES      YES   latency | throughput
	mlslabel        YES      YES   <sensitivity label>
	mountpoint      YES      YES   <path> | legacy | none
	nbmand          YES      YES   on | off
	normalization    NO      YES   none | formC | formD | formKC | formKD
	overlay         YES      YES   on | off
	primarycache    YES      YES   all | none | metadata
	quota           YES       NO   <size> | none
	readonly        YES      YES   on | off
	recordsize      YES      YES   512 to 1M, power of 2
	redundant_metadata YES      YES   all | most
	refquota        YES       NO   <size> | none
	refreservation  YES       NO   <size> | none
	relatime        YES      YES   on | off
	reservation     YES       NO   <size> | none
	rootcontext     YES       NO   <selinux rootcontext>
	secondarycache  YES      YES   all | none | metadata
	setuid          YES      YES   on | off
	sharenfs        YES      YES   on | off | share(1M) options
	sharesmb        YES      YES   on | off | sharemgr(1M) options
	snapdev         YES      YES   hidden | visible
	snapdir         YES      YES   hidden | visible
	snapshot_count  YES       NO   <count>
	snapshot_limit  YES       NO   <count> | none
	sync            YES      YES   standard | always | disabled
	utf8only         NO      YES   on | off
	version         YES       NO   1 | 2 | 3 | 4 | 5 | current
	volblocksize     NO      YES   512 to 128k, power of 2
	volsize         YES       NO   <size>
	vscan           YES      YES   on | off
	xattr           YES      YES   on | off | dir | sa
	zoned           YES      YES   on | off
	userused@...     NO       NO   <size>
	groupused@...    NO       NO   <size>
	userquota@...   YES       NO   <size> | none
	groupquota@...  YES       NO   <size> | none
	written@<snap>   NO       NO   <size>

Sizes are specified in bytes with standard units such as K, M, G, etc.

User-defined properties can be specified by using a name containing a colon (:).

The {user|group}{used|quota}@ properties must be appended with
a user or group specifier of one of these forms:
    POSIX name      (eg: "matt")
    POSIX id        (eg: "126829")
    SMB name@domain (eg: "matt@sun")
    SMB SID         (eg: "S-1-234-567-89")
petros@newton:~$ sudo zdb -L | grep ashift
            ashift: 9
petros@newton:~$