Grass Valley iControl V.4.43 User Manual
Page 589
iControl
User Guide
579
In a Redundancy Group topology configured for Auto-failover, there may be multiple Main
Application Servers but only one Backup in an n+1 redundancy scheme.
To enable the Auto-failover feature, you must first configure your Redundancy Group on
iControl Webmin’s Redundancy Configuration Form and manually enabled the Auto-failover
function on one or more Main Application Servers.
The Backup Application Server monitors the health of the Main Application Server and its
connection to devices and the network, through the use of a heartbeat trigger. As long as both
of the following conditions are met, no Auto-failover will occur:
• There is a heartbeat from the Main to the Backup.
• The Main can communicate with other devices (besides the Backup Application Server)
over its eth0 interface.
The heartbeat is carried on a Main network cable which connects all Main Application Servers
in a Redundancy Group to the Backup Application Server.
The heartbeat cabling between the Main and the Backup has two cable paths: the Main
network and the Heartbeat network. The Backup Application Server uses the Main network
but switches to using the Heartbeat network if the Main network is unresponsive.
IMPORTANT: If you configure your Redundancy Group NOT to take over the Main’s IP address
upon failover or takeover, make sure you keep the Backup Application Server’s
IP address configured in System tools | Edit service locations | Service and
alarm discovery on all Application Servers that belong to the Redundancy
Group.
Note: Several Backup Application Servers may exist in the Redundancy Group but
in the case of Auto-failover, an operator must choose (or accept the default choice)
only one of them.
IMPORTANT: Ethernet Port Label Considerations
If your Application Server is a Dell PowerEdge R200, R210, or R310, please read
the section regarding Ethernet port labels (see
"Ethernet Port Labeling on the
R210 and R310 Application Servers"
IMPORTANT: The Heartbeat network and the Main network use cables and equipment that are
distinct from one another to avoid single points of failure.