[Answer ID: 12805]

How can I configure the failover function?

Created 06/24/2011 09:03  |   Updated 04/20/2012 02:28
  • You can configure the failover function for
    TS-WVHL/R1 series, TS-QVHL/R6 series, TS-RVHL/R6 series, TS-6VHL/R6 series, TS-8VHL/R6 series. 
  • Use the same model and same capacity TeraStation for the main TeraStation and backup TeraStation.
    If the capacity of the main TeraStation is larger than that of the backup TeraStation, an error occurs, and files cannot be copied to the backup TeraStation.
  • All data stored in the backup TeraStation will be deleted when it is configured.
  • Failover function is copying data with the same way as the replication.
    You need to confirm restrictions of the replication function as well.
  • The internal hard drives need to be added up to a maximum volume which can be mounted on the unit.
    e.g. TS-WVHL/E -> 2 drives / TS-8VHL/E -> 8 drives

Configure Failover on the main TeraStation. Admin password for Backup Terastation is required.

ImageClick here to see the restrictions on Failover function.

<<How to configure>>

  1. Before configuring failover, navigate to [System] - [Maintenance] - [Restart TeraStation] in the main TeraStation's Web Admin interface and reboot the TeraStation.
  2. After the reboot, navigate to [System] - [Failover] in the Web Admin interface.
  3. Select a TeraStation from the drop-down list to be the target backup device.
    *You can not set multiple TeraStations as the target backup devices.
  4. Enter the administrator password of the target TeraStation, and click [Failover Start].
  5. If the administration password is correct, the backup TeraStation will beeping.
  6. To accept the settings from the source TeratStation, hold down the function button on the front of the target TeraStation until it stops beeping.


In case the capacity fo the main TeraStation and backup TeraStation are different

If the total capacity of backup unit is bigger than the main device, RAID array on the backup unit changes to the same as the main unit.

Except the above case, same RAID array can not be configured for the failover.
In this case, RAID array will be established with all disks as the following priority.

  • A device with more than 4 hard drives: RAID6 > RAID5 > RAID0
  • A device with 2 hard drives: RAID1 > RAID0

If you configure RAID 0 with all drives, becomes less capacity than the main unit on the backup unit, you can start configuring the failover tasks but the data in the main unit can not be copied all to the backup unit.
The information code, I33 (Replication Failure), will be shown while copying, then.

*If the capacity of main and backup TeraStations are different, the capacity of main unit might be over the whole capacity of the backup unit.
*Since the data on main TeraStation can not be copied to the backup TeraStation, I33 (ReplicationFailure) will be displayed on LCD of the main unit.
If you reboot the main TeraStation, I33 will disappear. Log into the Web admin interface on the main unit and stop Failover task.

Ethernet cable connection methods:

Use of the configurations below is recommended when making connections with Ethernet cables.
* Note: Use fixed IP addresses. Because the IP address of the TeraStation designated as the backup cannot be changed, set the IP address before configuring failover.

  • Connecting to the network at LAN port 1 and setting failover at LAN port 1.
  • Connecting to the network at LAN port 1 and setting failover at LAN port 2.


Using with UPS

Once failover is configured, you will not be able to set up a UPS link for the backup TeraStation. So, configure your UPS before configuring failover.
UPS recovery can be configured for both the main TeraStation and the backup TeraStation. However, the UPS settings of the main TeraStation are not copied to the backup TeraStation. UPS settings for both TeraStations should be configured manually before configuring failover.

Description of setting items

Service IP Address The [Service IP Address] in the Web Admin interface is the IP address that overrides the current setting when the backupTeraStation takes over operation from the main TeraStation.
If no service IP address is set or a fixed IP address is set, an attempt is made to inherit the IP address set for the main TeraStation. If the same IP address cannot be set, such as due to an IP address conflict, the same IP address may not be inherited.
The IP address may also not be inherited in DHCP server environments.
* The Service IP Address setting is optional.
Advanced Settings

The backup TeraStation polls regularly to the main TeraStation.
If it counts Polling Retry in certain times, the operation switches to new TeraStation (the backup TeraStation).
You can configure the Polling interval and retry counts when the backup TeraStation switches to the main TeraStation.



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