5 Select the LAN port to be used for sharing files and enter a virtual IP address and subnet mask. The LAN port
you have selected here will also be used for pinging. If you select the same LAN port as the backup LAN port,
the backup TeraStation will replace the main TeraStation even if just a network error occurs.
About virtual IP addresses: A virtual IP address is an IP address that will be used for file sharing while failover
is configured. By assigning a different IP address from the one to be assigned to the LAN port, you can access
the TeraStation for sharing files, as well as open Settings using the virtual IP address. This IP address will be
inherited to the backup TeraStation when failover occurs, so you can access the backup TeraStation even if you
don’t know the backup TeraStation’s static IP address.
Configure an unused IP address for the virtual IP; make sure it uses the same segment as the main and backup
TeraStations.
6 Select the LAN port to be used for transferring data via failover.
7 Configure whether or not to inherit the settings of subfolders’ access restrictions to the backup TeraStation,
then click Continue.
8 If the admin username and password is correct, the I51 message will appear as a notification for both main
and backup TeraStations, and the backup TeraStation will beep. Press and hold down the function button on
the backup TeraStation to accept the settings from the main TeraStation. When you press the function button,
the backup TeraStation will stop beeping.
9 Press the function button. When you press the function button, the TeraStation will beep once. Press and hold
down the button until the backup TeraStation beeps again.
10 Initialization on the main and backup TeraStations will begin. Wait until it finishes.
11 The process is complete when the I51 message disappears.
Notes:
• Only use identical model and capacity TeraStations for failover. If the capacity of the main TeraStation is larger
than that of the backup TeraStation, an I33 replication error will occur.
• All drive bays of a TeraStation should be occupied if it will be used for failover. Failover will not work if a drive is
missing from any bay.
• If replication is configured for more than one folder, initialize the TeraStation before configuring failover.
• The main TeraStation cannot be used as the backup location for Time Machine.
• Do not use the same TeraStation for both failover and replication, or failover and Time Machine.
• If email notification is enabled and failover occurs, navigate to Management> Email Notification> Edit in the main
TeraStation’s Settings and click OK.
• MTU size settings for main and backup TeraStations should be 1,500 bytes. To change the MTU size, refer to the
“Jumbo Frames” section in chapter 9.
• Files whose filenames contain more than 80 alphanumeric characters will not be backed up.
• If the I33 message appears as a notification, navigate to Backup> Failover> Configure Failover and click Syncing.
• The RAID array on the backup TeraStation may be reconfigured and resynchronized as part of the failover
configuration process. This is expected behavior and not an error.
Changing Settings While Failover Is Configured
Before changing any TeraStation settings while failover is configured, make sure the TeraStation has entered into
maintenance mode. If you change any settings without entering into maintenance mode, the I49 message may
appear.
For the procedure to enter maintenance mode, refer to the “Maintenance Mode” section below.
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