About the high availability appliance cluster
HPE OneView achieves high availability through an appliance cluster that comprises two appliances. The appliances are defined by their role:
Role |
Function |
---|---|
active |
Currently hosts the services for the appliance cluster. |
standby |
Ready to become the active appliance in case the active appliance becomes unavailable. The standby appliance becomes active when:
|
unused |
Ready to become a standby appliance if it has a compatible firmware version and the previous standby appliance is no longer configured for standby or was removed from the enclosure. |
The standby appliance monitors the active appliance and assumes control when contact is lost.
Consider two cluster members A and B:
The standby appliance (B) detects that it can no longer communicate with the active appliance (A).
Cluster member B causes A to reboot.
Cluster member B assumes control of operations as the active appliance.
Cluster member A becomes the standby appliance.
The appliance cluster becomes highly available again.
In addition, you can activate the standby appliance manually to cause the cluster members to swap roles.