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cDVR User Guide, Release 2.0 155
System Configuration - Redundancy Tree
Recover Branch
The Recover branch allows you to force a manual recovery from the currently active RM to the standby
RM.
To access and use the redundancy Failover menu, proceed as follows:
1.
Ensure you are logged into the VIP for the redundancy group.
2.
From the System tab, click on the triangle next to the Redundancy branch to expand out one
level.
3.
Click the Recover entry to open the Redundancy Host window.
4.
Click the execute (
)
icon to open the Execute Redundancy Recovery window:
5.
Click Submit to execute the recovery immediately.
Redundancy Switchover and Recovery Behavior.
Following are guidelines to how redundancy switchover and recovery behaves.
•
Recovery is always manual, either from a application restart or using recovery command in the GUI.
•
Recovery must always be done on the host your are attempting to recover (e.g. the failed RM). It
cannot be done from the active RM.
•
If a failover is attempted but the standby unit is also failed, then the failing unit will go from active
to degraded. A switchover will not happen. When another RM becomes available, the failover will
complete, the degraded host will enter a ‘failed’ state, and the standby RM enters the ‘active’ state.
•
The Degraded state means that the host wants to fail, but cannot because the standby unit is not
available. (additional note: a 'degraded' host can be manually recovered back to the active state).
•
Once the standby unit becomes available, the failover operation will complete; thus the failing
unit's 'degraded' state will move to a 'failed' state. The standby unit will now be the active unit.
Registered Apps Branch
The Registered Apps branch provides information about external applications that are registered for
Redundancy Notifications.
Note: This menu is primarily for debugging when working with Imagine Communications Customer
Support.
To access the redundancy Registered Apps menu, proceed as follows:
1.
Ensure you are logged into the VIP for the redundancy group.
2.
From the System tab, click on the triangle next to the Redundancy branch to expand out one
level.