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21 .\" Copyright (c) 2009 Sun Microsystems, Inc. All Rights Reserved.
22 .\" Copyright 2011 Joshua M. Clulow <josh@sysmgr.org>
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38 .Nd create snapshots of ZFS datasets
43 .Oo Fl o Ar property Ns = Ns Ar value Oc Ns …
44 .Ar dataset Ns @ Ns Ar snapname Ns …
47 All previous modifications by successful system calls to the file system are
48 part of the snapshots.
49 Snapshots are taken atomically, so that all snapshots correspond to the same
52 can be used as an alias for
60 .It Fl o Ar property Ns = Ns Ar value
61 Set the specified property; see
65 Recursively create snapshots of all descendent datasets
69 .\" These are, respectively, examples 2, 3, 10, 15 from zfs.8
70 .\" Make sure to update them bidirectionally
71 .Ss Example 1 : No Creating a ZFS Snapshot
72 The following command creates a snapshot named
74 This snapshot is mounted on demand in the
76 directory at the root of the
79 .Dl # Nm zfs Cm snapshot Ar pool/home/bob Ns @ Ns Ar yesterday
81 .Ss Example 2 : No Creating and Destroying Multiple Snapshots
82 The following command creates snapshots named
83 .Ar yesterday No of Ar pool/home
84 and all of its descendent file systems.
85 Each snapshot is mounted on demand in the
87 directory at the root of its file system.
88 The second command destroys the newly created snapshots.
89 .Dl # Nm zfs Cm snapshot Fl r Ar pool/home Ns @ Ns Ar yesterday
90 .Dl # Nm zfs Cm destroy Fl r Ar pool/home Ns @ Ns Ar yesterday
92 .Ss Example 3 : No Promoting a ZFS Clone
93 The following commands illustrate how to test out changes to a file system, and
94 then replace the original file system with the changed one, using clones, clone
95 promotion, and renaming:
96 .Bd -literal -compact -offset Ds
97 .No # Nm zfs Cm create Ar pool/project/production
98 populate /pool/project/production with data
99 .No # Nm zfs Cm snapshot Ar pool/project/production Ns @ Ns Ar today
100 .No # Nm zfs Cm clone Ar pool/project/production@today pool/project/beta
101 make changes to /pool/project/beta and test them
102 .No # Nm zfs Cm promote Ar pool/project/beta
103 .No # Nm zfs Cm rename Ar pool/project/production pool/project/legacy
104 .No # Nm zfs Cm rename Ar pool/project/beta pool/project/production
105 once the legacy version is no longer needed, it can be destroyed
106 .No # Nm zfs Cm destroy Ar pool/project/legacy
109 .Ss Example 4 : No Performing a Rolling Snapshot
110 The following example shows how to maintain a history of snapshots with a
111 consistent naming scheme.
112 To keep a week's worth of snapshots, the user destroys the oldest snapshot,
113 renames the remaining snapshots, and then creates a new snapshot, as follows:
114 .Bd -literal -compact -offset Ds
115 .No # Nm zfs Cm destroy Fl r Ar pool/users@7daysago
116 .No # Nm zfs Cm rename Fl r Ar pool/users@6daysago No @ Ns Ar 7daysago
117 .No # Nm zfs Cm rename Fl r Ar pool/users@5daysago No @ Ns Ar 6daysago
118 .No # Nm zfs Cm rename Fl r Ar pool/users@4daysago No @ Ns Ar 5daysago
119 .No # Nm zfs Cm rename Fl r Ar pool/users@3daysago No @ Ns Ar 4daysago
120 .No # Nm zfs Cm rename Fl r Ar pool/users@2daysago No @ Ns Ar 3daysago
121 .No # Nm zfs Cm rename Fl r Ar pool/users@yesterday No @ Ns Ar 2daysago
122 .No # Nm zfs Cm rename Fl r Ar pool/users@today No @ Ns Ar yesterday
123 .No # Nm zfs Cm snapshot Fl r Ar pool/users Ns @ Ns Ar today