Is it OK to place a secondary fault tolerant SpectroSERVER system in a different subnet and/or datacenter and/or physical location?
Placing a secondary fault tolerant SpectroSERVER in a different subnet and/or data center will work fine. It is actually a good idea to have the secondary SpectroSERVER on a different subnet and location than the primary.
That way, they each have different perspectives on the network. If a switch located upstream of the primary SS goes down, the secondary SpectroSERVER may still be able to see the network when taking over primary management.
Also, if there is an outage (power, communications), the secondary SpectroSERVER will less likely be affected since it is in a separate location.
Please reference the "Establish Fault Tolerance" section of the documentation for more information.
NOTE: If there is a firewall between the primary and secondary SpectroSERVER, specific ports are required to be open between the primary and secondary SpectroSERVER systems and the OneClick and secondary SpectroSERVER systems in order for Fault Tolerance to work. Please reference the "Communication Across Firewalls" section of the documentation for more information.