QNAP TVS-472XT 4-Bay NAS Enclosure - Manual (Page 127)

Type Description
Application consistent The snapshot records the state of data and
applications on the LUN. The iSCSI host flushes data
in memory to the LUN before QTS takes a snapshot.
If VMware vCenter is using the LUN, vCenter takes a
virtual machine snapshot.
Important
This option is only available for VMware
vCenter, or for Volume Shadow Copy
Service (VSS) aware applications running
on a Windows server. You must install
QNAP Snapshot Agent on the iSCSI
initiator.
8. Optional: Enable smart snapshots.
When enabled, QTS only takes a snapshot if data on the volume or LUN was modified since the last
snapshot was taken.
9. Optional: Specify a description.
The description helps you to identify the snapshot.
10. Click OK.
A confirmation message appears.
11. Click OK.
QTS starts taking snapshots according to the schedule.
Snapshot Management
Snapshot Retention Policy
The snapshot retention policy determines how long QTS keeps each snapshot of a volume or LUN before
deleting it. Each volume and LUN has its own individual snapshot retention policy.
Configuring a Snapshot Retention Policy
Important
After you create or modify a snapshot retention policy, QTS applies the new policy to
existing snapshots. If the new policy is more restrictive than the previous policy, for
example changing from Keep for: 5 days to Keep for: 2 days , then QTS deletes
existing snapshots to conform with the new policy.
1. Go to Storage & Snapshots > Storage > Storage/Snapshots .
2. Select a thick volume, thin volume, or LUN.
3. Click Snapshot and then select Snapshot Manager.
The Snapshot Manager window opens.
4. Click Schedule Snapshot.
The Snapshot Settings window opens.
5. Click Snapshot Retention.
6. Select a snapshot retention policy.
QTS 4.4.x User Guide
Storage & Snapshots 126