The zfs list command provides an extensible mechanism for viewing and querying dataset information. Both basic and complex queries are explained in this section.
You can list basic dataset information by using the zfs list command with no options. This command displays the names of all datasets on the system including their used, available, referenced, and mountpoint properties. For more information about these properties, see ZFS Properties.
For example:
# zfs list
NAME USED AVAIL REFER MOUNTPOINT
pool 84.0K 33.5G - /pool
pool/clone 0 33.5G 8.50K /pool/clone
pool/test 8K 33.5G 8K /test
pool/home 17.5K 33.5G 9.00K /pool/home
pool/home/marks 8.50K 33.5G 8.50K /pool/home/marks
pool/home/marks@snap 0 - 8.50K /pool/home/marks@snap
You can also use this command to display specific datasets by providing
the dataset name on the command line. Additionally, use the the
r
option
to recursively display all descendants of that dataset.
The following example shows how to display tank/home/chua
and
all of its descendant datasets.
# zfs list -r tank/home/chua
NAME USED AVAIL REFER MOUNTPOINT
tank/home/chua 26.0K 4.81G 10.0K /tank/home/chua
tank/home/chua/projects 16K 4.81G 9.0K /tank/home/chua/projects
tank/home/chua/projects/fs1 8K 4.81G 8K /tank/home/chua/projects/fs1
tank/home/chua/projects/fs2 8K 4.81G 8K /tank/home/chua/projects/fs2
For additional information about the zfs list command, see zfs ( 1M ) .
The zfs list output can be customized by using of
the
o
,
f
, and
H
options.
You can customize property value output by using the
o
option
and a comma-separated list of desired properties. Supply any dataset property
as a valid value. For a list of all supported dataset properties, see ZFS Properties. In addition to the properties defined
there, the
o
option list can also contain the literal name
to indicate that the output should include the name of the dataset.
The following example uses zfs list to display the dataset name, along with the sharenfs and mountpoint properties.
# zfs list -o name,sharenfs,mountpoint
NAME SHARENFS MOUNTPOINT
tank rw /export
tank/archives rw /export/archives
tank/archives/zfs rw /export/archives/zfs
tank/calendar off /var/spool/calendar
tank/cores rw /cores
tank/dumps rw /export/dumps
tank/home rw /export/home
tank/home/ahl rw /export/home/ahl
tank/home/ahrens rw /export/home/ahrens
tank/home/andrei rw /export/home/andrei
tank/home/barts rw /export/home/barts
tank/home/billm rw /export/home/billm
tank/home/bjw rw /export/home/bjw
tank/home/bmc rw /export/home/bmc
tank/home/bonwick rw /export/home/bonwick
tank/home/brent rw /export/home/brent
tank/home/dilpreet rw /export/home/dilpreet
tank/home/dp rw /export/home/dp
tank/home/eschrock rw /export/home/eschrock
tank/home/fredz rw /export/home/fredz
tank/home/johansen rw /export/home/johansen
tank/home/jwadams rw /export/home/jwadams
tank/home/lling rw /export/home/lling
tank/home/mws rw /export/home/mws
tank/home/rab rw /export/home/rab
tank/home/sch rw /export/home/sch
tank/home/tabriz rw /export/home/tabriz
tank/home/tomee rw /export/home/tomee
You can use the
t
option to specify the types of datasets
to display. The valid types are described in the following table.
Table 5.2. Types of ZFS Datasets
Type |
Description |
---|---|
|
File systems and clones |
|
Volumes |
|
Snapshots |
The
t
options takes a comma-separated list of the types
of datasets to be displayed. The following example uses the
t
and
o
options simultaneously to show the name and used property
for all file systems:
# zfs list -t filesystem -o name,used
NAME USED
pool 105K
pool/container 0
pool/home 26.0K
pool/home/tabriz 26.0K
pool/home/tabriz_clone 0
You can use the
H
option to omit the zfs list header
from the generated output. With the
H
option, all white space
is output as tabs. This option can be useful when you need parseable output,
for example, when scripting. The following example shows the output generated
from using the zfs list command with the
H
option:
# zfs list -H -o name
pool
pool/container
pool/home
pool/home/tabriz
pool/home/tabriz@now
pool/home/tabriz/container
pool/home/tabriz/container/fs1
pool/home/tabriz/container/fs2
pool/home/tabriz_clone