Failover and External Storage

External storage for ST appliances, such as NAS storage, is not replicated as part of the failover configuration.

When configuring a NAS device used by an ST appliance in an HA pair, add the private IP addresses of both ST appliances and the public IP address to the NAS device’s accepted IP address list.

When an ST appliance fails over, its NAS storage is automatically switched over to the standby appliance as it becomes active. For example:

  1. Appliance 1 is the active ST appliance, appliance 2 is the standby ST appliance, NAS storage is in use by appliance 1.
  2. Appliance 1 fails, appliance 2 becomes the new active appliance.
  3. Appliance 2 immediately starts using the NAS storage directly, just as appliance 1 had before.