When an abnormality occurs on any of the multiple server devices that make up the cluster system (hereafter referred to as "nodes"), the failover feature transfers a job operating on such a node to another one. Failover can reduce the time for which jobs are stopped when an abnormality occurs, and allows jobs to continue while the node on which the abnormality occurred is recovered.
Figure 2.1 Concept of failover
Failover operation in Symfoware Server supports the standby feature.
When an abnormality occurs on a node, the standby feature activates the instance that is the standby system at the time of the switch, and transfers the job to it.
Operation mode of failover operation
The operation mode supported in failover operation in Symfoware Server is 1:1 standby.
1:1 standby is a mode in which one active system or standby system operates on one node. Because failover allows jobs to continue when an abnormality occurs in the active system, this mode allows highly reliable systems to be constructed.
