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Failover
With failover, two TeraStations are connected to the network for redundancy. If an issue renders the main
TeraStation inaccessible, operation automatically switches to the backup TeraStation.
Main
Failover will activate during any of the following situations:
• The backup TeraStation cannot detect the main TeraStation within a specified time
If the backup TeraStation has not received a packet from the main TeraStation within a specified time, the backup
TeraStation considers the main TeraStation to have failed. By default, it will try 5 times and wait 60 seconds. If this
is triggered by accident, reconfigure failover from the main TeraStation.
• Errors
Failover will occur if any of the following errors occur:
E12 (cooling failure), E14 (cannot mount RAID array), E16
(drive failure)
* When the drive is configured in JBOD.
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.
Before Configuring Failover
Use the same LAN ports for transferring data and configure both TeraStations with static IP addresses for the
purposes of failover.
When failover, the backup TeraStation will take over the hostname and IP address of the main TeraStation unless the
IP conflict is detected. If you want to assign different IP address to the backup TeraStation after failover, configure
the "service IP address". The service IP address will be a new address of the backup TeraStation when it takes over
operation from the TeraStation.
Using the Same LAN Port for Both Failover and Connecting to the Network
Using this setup, if the main TeraStation fails, the backup TeraStation will replace it completely. The backup
TeraStation will be updated over normal network traffic.
Data on both TeraStations stays up-to-date.
Switches automatically if failure occurs.
(drive not found), E22
*
95
Backup
(cannot mount drive), E30
*
*
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