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h2. How to Create a ZFS File System Snapshot

A good practice is to create a snapshot of important data on a regular basis. Then, back up the snapshot to a disk or tape.

Starting in the OpenSolaris 2008.11 release, an automatic snapshot service is available to manage automatic snapshots. For more information, see http://wikis.sun.com/display/OpenSolarisInfo/How+to+Manage+Automatic+ZFS+Snapshots.

h5. Steps

# {include:root_step}
# *Create a file system for storing data.*
For example:
{code}
# /usr/sbin/zfs create rpool/export/home/data
{code}
# *Create a snapshot of a ZFS file system.*
For example, a snapshot called {{data@0805}} is created. It contains all of the file system data at the time that the snapshot was taken.
{code}
$ /usr/sbin/zfs snapshot rpool/export/home/data@0805
{code}
# *Verify the file system snapshot.*
{code}
$ /usr/sbin/zfs list -t snapshot
NAME USED AVAIL REFER MOUNTPOINT
rpool/export/home/data@0805 0 - 77.8M -
{code}
# *(Optional) If you accidentally delete a file, you can restore it from the file system snapshot.*
For example, {{file.3}} is restored from the {{.zfs/snapshot/0805}} directory.
{code}
$ pwd
/export/home/data
# cp .zfs/snapshot/0805/file.3 file.3
# ls /export/home/data
file.1 file.2 file.3
{code}
*Tip* \- Review the automatic snapshot script that is included in this blog: http://blogs.sun.com/timf/entry/zfs_automatic_for_the_people.

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