Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 366)

F ACTORY T ALK V IEW S ITE E DITION U SER ’ S G UIDE
14–22
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If the secondary server is on standby, and ready to become active, it becomes the Active
server. If the secondary server is unavailable, the HMI server is taken out of service.
Clients that were connected at the time of the failure, start using the Active secondary
server within 30 seconds of it becoming active.
Clients will only connect to an Active server.
If for some reason the secondary server cannot finish becoming active, then the server is
taken out of service. For information about when an HMI server becomes active, see
“Determining the Active HMI server in a redundant pair” on page 14-17.
Switching back to primary, or staying with the Active server
When service is restored at the primary server, either the system will switch back to the
primary server automatically, or the secondary server will remain active.
This depends on the switchover option you select in the Redundancy tab of the HMI
server’s Properties dialog box. For details options in the Properties dialog box, click Help.
Continuing to use the secondary server
If you select the switchover option, Continue using the secondary server even when the
primary server becomes available again, the secondary server will remain the Active
server, even if the primary server is ready.
Use this option if want to be able to choose when to switch back to the primary server.
When you are ready, you can manually change the Active and Standby servers. For more
information, see page 14-19.
Clients will remain connected to the healthy Active server, until you perform the manual
switchover, or until the currently Active secondary server fails.
If the Active secondary server fails, as long as the primary server is on standby and ready
to provide service, then the primary server will become the new, Active server.
Switching back automatically to the primary server
If you select the switchover option, Switch over to the primary server when it becomes
available, the system will switch back automatically, from an Active secondary to a
restored primary server.
Connected clients will switch back to the Active primary server, as soon as it is ready.
If both primary and secondary servers become active, then the servers decide which will be the
Active server. For more information, see page 14-19.
You can also select a switchover option in the Server Status dialog box.