Priority

VCS selects the system with the lowest priority as the failover target. The Priority failover policy is ideal for simple two-node clusters or small clusters with few service groups.

Priority is set in the SystemList attribute implicitly via ordering, such as SystemList = {SystemA, SystemB} or explicitly, such as SystemList = {SystemA=0, SystemB=1}. Priority is the default behavior.

RoundRobin

VCS selects the system running the fewest service groups as the failover target. This policy is ideal for large clusters running many service groups with similar server load characteristics (for example, similar databases or applications)

Load

The Load failover policy comprises the following components:

System capacity and service group load, represented by the attributes Capacity and Load respectively.

System limits and service group prerequisites, represented by the attributes Limits and Prerequisites, respectively.