Snapshot Replica

The Snapshot Replica allows you to replicate the volume/LUNs between different remote servers using snapshot technology, which provides a flexible and efficient backup service for IT professionals.

To use this function, please enable the SSH server ("Control Panel" > "Network Services" > "Telnet/SSH") on the remote NAS first. Note that you may also access this function via Storage Manager ("Storage Manager" > "Storage Space"> "Snapshot" > "Snapshot Replica" for volumes or "Storage Manager" > "iSCSI Storage"> "Snapshot" > "Snapshot Replica" for LUNs.)

Note: Snapshots and related features are currently only available for the following NAS series: x51*, x53, x63, x70, x71, x79, x80.

•	* A minimum of 4 GB RAM is required to use snapshots.

•	* x51 series models only support up to 256 snapshots instead of 1024. The HS-251 does not support snapshots.

Creating Replication Jobs

Follow these steps to create a snapshot replication job.

1.	Click "Create a Replication Job".

2.	Enter a name for this job.

Click "Settings" to specify the settings for the remote server. Enter the IP address, username and password for the remote server. Check "Local site" if the replication job is for your local NAS. Note that the login account must have read/write access to the remote server and sufficient quota limit on the server. Click "Test" to verify the connection. Then click "OK".

4.	Select the local volume to take snapshot of by clicking the "Source Volume/LUN" drop-down list.

5.	Select the destination pool to store the snapshots in the "Destination Pools" box.

6.	Keep Snapshots: The maximum number is 1024. The system keeps this fixed number of versions and automatically rotates stored versions.

7.	Click "Backup frequency" to configure the backup frequency. Select to replicate the data immediately or specify the backup schedule.

8.	Specify other options as follows for the remote replication job by clicking the "Options" button and click "OK" after setup.

o	Enable encryption: Select this option to execute encrypted remote replication. Note that you must enable "Allow SSH connection" in "Network Services > "Telnet/SSH" and specify the same port number for SSH and encrypted remote replication.

o	Enable maximum transfer rate: Enter the value to restrict maximum available bandwidth in KB/s. If it is not specified, the bandwidth for this job is not limited.

o	Compress files during transmission: Enable this option to allow file compression during the data transfer process. This option is recommended for a low bandwidth environments or remote replication over WAN.

o	Replicate all snapshots: Select this option to replicate all snapshots. If this option is not selected, the system will only replicate the snapshot taken by the job.

9.	Click "OK". If you select the "Execute backup immediately" option, the replication task will start at once. Otherwise, it will be performed according to your schedule. Note that the job is recursive. Do not turn off the local NAS and the remote server when remote replication is running.

Icon	Name	Description
	Enable and Start	Enable connection to a remote server. Start a replication job.
	Stop	Stop a replication job.
	View	View job status and logs; clear logs.
	Edit	Edit the settings of a replication job.
	Enable/Disable Schedule	Enable or disable a scheduled replication job.

The system displays logs of all replications jobs at the bottom of the screen. Click "Clear all logs" to clear job logs.

Deleting Replication Jobs

1.	Select a replication job from the list.

2.	Click "Delete".

3.	Click "OK".

Options

To change connection options, click "Options" and specify the timeout period of the number of connection retries.

In case the password used for access to the remote server is changed, you can click "Change Password" and click the "edit" button under "Action" to change the password used for that server.

To delete previous Snapshot Replica logs, click "Clear all logs".

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