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6c29422e90
Make the section heading more generic (the section relates to ZFS files as well as ZFS volumes). Swapping to a ZFS volume is prone to deadlock. Remove the related instruction, direct readers to OpenZFS FAQ. Related, but not linked from within the manual page: <https://openzfs.github.io/openzfs-docs/Project%20and%20Community/FAQ.html#using-a-zvol-for-a-swap-device-on-linux> (Using a zvol for a swap device on Linux). Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Graham Perrin <grahamperrin@freebsd.org> Issue #7734 Closes #14756
280 lines
7.8 KiB
Groff
280 lines
7.8 KiB
Groff
.\"
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.\" CDDL HEADER START
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.\"
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.\" The contents of this file are subject to the terms of the
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.\" Common Development and Distribution License (the "License").
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.\" You may not use this file except in compliance with the License.
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.\"
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.\" You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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.\" or https://opensource.org/licenses/CDDL-1.0.
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.\" See the License for the specific language governing permissions
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.\" and limitations under the License.
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.\"
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.\" When distributing Covered Code, include this CDDL HEADER in each
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.\" file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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.\" If applicable, add the following below this CDDL HEADER, with the
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.\" fields enclosed by brackets "[]" replaced with your own identifying
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.\" information: Portions Copyright [yyyy] [name of copyright owner]
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.\"
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.\" CDDL HEADER END
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.\"
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.\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
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.\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
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.\" Copyright (c) 2011, 2019 by Delphix. All rights reserved.
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.\" Copyright (c) 2013 by Saso Kiselkov. All rights reserved.
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.\" Copyright (c) 2014, Joyent, Inc. All rights reserved.
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.\" Copyright (c) 2014 by Adam Stevko. All rights reserved.
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.\" Copyright (c) 2014 Integros [integros.com]
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.\" Copyright 2019 Richard Laager. All rights reserved.
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.\" Copyright 2018 Nexenta Systems, Inc.
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.\" Copyright 2019 Joyent, Inc.
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.\"
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.Dd March 16, 2022
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.Dt ZFS-CREATE 8
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.Os
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.
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.Sh NAME
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.Nm zfs-create
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.Nd create ZFS dataset
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.Sh SYNOPSIS
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.Nm zfs
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.Cm create
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.Op Fl Pnpuv
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.Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
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.Ar filesystem
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.Nm zfs
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.Cm create
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.Op Fl ps
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.Op Fl b Ar blocksize
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.Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
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.Fl V Ar size Ar volume
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.
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.Sh DESCRIPTION
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.Bl -tag -width ""
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.It Xo
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.Nm zfs
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.Cm create
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.Op Fl Pnpuv
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.Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
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.Ar filesystem
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.Xc
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Creates a new ZFS file system.
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The file system is automatically mounted according to the
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.Sy mountpoint
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property inherited from the parent, unless the
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.Fl u
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option is used.
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.Bl -tag -width "-o"
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.It Fl o Ar property Ns = Ns Ar value
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Sets the specified property as if the command
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.Nm zfs Cm set Ar property Ns = Ns Ar value
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was invoked at the same time the dataset was created.
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Any editable ZFS property can also be set at creation time.
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Multiple
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.Fl o
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options can be specified.
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An error results if the same property is specified in multiple
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.Fl o
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options.
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.It Fl p
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Creates all the non-existing parent datasets.
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Datasets created in this manner are automatically mounted according to the
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.Sy mountpoint
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property inherited from their parent.
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Any property specified on the command line using the
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.Fl o
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option is ignored.
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If the target filesystem already exists, the operation completes successfully.
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.It Fl n
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Do a dry-run
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.Pq Qq No-op
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creation.
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No datasets will be created.
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This is useful in conjunction with the
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.Fl v
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or
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.Fl P
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flags to validate properties that are passed via
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.Fl o
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options and those implied by other options.
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The actual dataset creation can still fail due to insufficient privileges or
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available capacity.
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.It Fl P
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Print machine-parsable verbose information about the created dataset.
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Each line of output contains a key and one or two values, all separated by tabs.
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The
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.Sy create_ancestors
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and
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.Sy create
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keys have
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.Em filesystem
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as their only value.
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The
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.Sy create_ancestors
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key only appears if the
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.Fl p
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option is used.
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The
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.Sy property
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key has two values, a property name that property's value.
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The
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.Sy property
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key may appear zero or more times, once for each property that will be set local
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to
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.Em filesystem
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due to the use of the
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.Fl o
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option.
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.It Fl u
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Do not mount the newly created file system.
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.It Fl v
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Print verbose information about the created dataset.
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.El
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.It Xo
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.Nm zfs
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.Cm create
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.Op Fl ps
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.Op Fl b Ar blocksize
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.Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
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.Fl V Ar size Ar volume
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.Xc
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Creates a volume of the given size.
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The volume is exported as a block device in
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.Pa /dev/zvol/path ,
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where
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.Em path
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is the name of the volume in the ZFS namespace.
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The size represents the logical size as exported by the device.
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By default, a reservation of equal size is created.
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.Pp
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.Ar size
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is automatically rounded up to the nearest multiple of the
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.Sy blocksize .
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.Bl -tag -width "-b"
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.It Fl b Ar blocksize
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Equivalent to
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.Fl o Sy volblocksize Ns = Ns Ar blocksize .
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If this option is specified in conjunction with
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.Fl o Sy volblocksize ,
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the resulting behavior is undefined.
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.It Fl o Ar property Ns = Ns Ar value
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Sets the specified property as if the
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.Nm zfs Cm set Ar property Ns = Ns Ar value
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command was invoked at the same time the dataset was created.
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Any editable ZFS property can also be set at creation time.
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Multiple
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.Fl o
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options can be specified.
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An error results if the same property is specified in multiple
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.Fl o
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options.
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.It Fl p
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Creates all the non-existing parent datasets.
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Datasets created in this manner are automatically mounted according to the
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.Sy mountpoint
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property inherited from their parent.
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Any property specified on the command line using the
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.Fl o
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option is ignored.
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If the target filesystem already exists, the operation completes successfully.
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.It Fl s
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Creates a sparse volume with no reservation.
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See
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.Sy volsize
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in the
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.Em Native Properties
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section of
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.Xr zfsprops 7
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for more information about sparse volumes.
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.It Fl n
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Do a dry-run
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.Pq Qq No-op
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creation.
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No datasets will be created.
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This is useful in conjunction with the
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.Fl v
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or
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.Fl P
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flags to validate properties that are passed via
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.Fl o
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options and those implied by other options.
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The actual dataset creation can still fail due to insufficient privileges or
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available capacity.
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.It Fl P
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Print machine-parsable verbose information about the created dataset.
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Each line of output contains a key and one or two values, all separated by tabs.
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The
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.Sy create_ancestors
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and
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.Sy create
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keys have
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.Em volume
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as their only value.
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The
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.Sy create_ancestors
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key only appears if the
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.Fl p
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option is used.
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The
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.Sy property
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key has two values, a property name that property's value.
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The
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.Sy property
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key may appear zero or more times, once for each property that will be set local
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to
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.Em volume
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due to the use of the
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.Fl b
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or
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.Fl o
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options, as well as
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.Sy refreservation
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if the volume is not sparse.
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.It Fl v
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Print verbose information about the created dataset.
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.El
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.El
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.Ss ZFS for Swap
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Swapping to a ZFS volume is prone to deadlock and not recommended.
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See OpenZFS FAQ.
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.Pp
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Swapping to a file on a ZFS filesystem is not supported.
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.
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.Sh EXAMPLES
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.\" These are, respectively, examples 1, 10 from zfs.8
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.\" Make sure to update them bidirectionally
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.Ss Example 1 : No Creating a ZFS File System Hierarchy
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The following commands create a file system named
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.Ar pool/home
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and a file system named
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.Ar pool/home/bob .
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The mount point
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.Pa /export/home
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is set for the parent file system, and is automatically inherited by the child
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file system.
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.Dl # Nm zfs Cm create Ar pool/home
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.Dl # Nm zfs Cm set Sy mountpoint Ns = Ns Ar /export/home pool/home
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.Dl # Nm zfs Cm create Ar pool/home/bob
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.
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.Ss Example 2 : No Promoting a ZFS Clone
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The following commands illustrate how to test out changes to a file system, and
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then replace the original file system with the changed one, using clones, clone
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promotion, and renaming:
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.Bd -literal -compact -offset Ds
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.No # Nm zfs Cm create Ar pool/project/production
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populate /pool/project/production with data
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.No # Nm zfs Cm snapshot Ar pool/project/production Ns @ Ns Ar today
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.No # Nm zfs Cm clone Ar pool/project/production@today pool/project/beta
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make changes to /pool/project/beta and test them
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.No # Nm zfs Cm promote Ar pool/project/beta
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.No # Nm zfs Cm rename Ar pool/project/production pool/project/legacy
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.No # Nm zfs Cm rename Ar pool/project/beta pool/project/production
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once the legacy version is no longer needed, it can be destroyed
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.No # Nm zfs Cm destroy Ar pool/project/legacy
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.Ed
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.
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.Sh SEE ALSO
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.Xr zfs-destroy 8 ,
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.Xr zfs-list 8 ,
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.Xr zpool-create 8
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