PLANET NAS-7450 - Manual (Page 72)

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2. Viewing Snapshot Information
On the page shows the snapshots existing on the volume and their information. “Snapshot
Used Space” indicates the disk space used by snapshot data. In the table – List of Snapshots,
“Space to Free” indicates the disk space which will be freed if a snapshot is deleted. “Activity”
indicates whether the snapshot is being deleted or rolled back.
3. Configuring Snapshot Settings
Item Description
Show the .snap
folder
With the .snap folders enabled, end-users can access snapshot data
without intervention of MIS people, retrieving previous versions of
files from the .snap folders.
Administrators can choose to show the .snap folders under the root of
a volume, or under all folders.
Name the .snap
folder as ~snap
Using the AFP protocol, the folders with names beginning with dot (.)
will be hidden and not able to be accessed by Macintosh clients. To
make the .snap folders visible, the administrators can choose to show
the .snap folders as ~snap instead so that the folders can be
accessed by Macintosh clients.
Delete snapshots if
free space is low
If enabled, it will automatically delete the oldest snapshots to free
more disk space when the free space is lower than the specified
percentage.
Snapshot Policy They specify how many hourly, daily, weekly and monthly snapshots
to keep, respectively. If the limit is exceeded, the oldest snapshot of
the same type will be deleted. If not specified, it will keep the
snapshots until being manually deleted.
4. Creating Snapshots
There are several ways to create snapshots. One is to create a snapshot manually by
selecting a volume and clicking the “Create Snapshot” button on the “Snapshot → Manage”
page. It will create a snapshot with a name like manual-20041010.190000, which indicates a
snapshot created manually at 19:00:00 of October 10, 2004. Another method is to set
schedules to create snapshots regularly. Moreover, the NAS server will create snapshots
automatically when doing tape backup, SmartSync and CD/DVD-burning tasks. Then it reads
in source data from the automatically created snapshots, instead of the current active
file-system, to prevent the open-file issue.
5. Deleting Snapshots
To delete snapshots, check the check-boxes in the “List of Snapshots” table and click the
“Delete” icon to delete the selected snapshots. You can make multiple selections to delete