A group can define a load-balancing policy. If it does, then any other group that contains at least one space belonging to this group cannot define a load-balancing policy. Thus, the load-balancing policy of the group determines the load-balancing behavior for the clustered proxy of any space member in the group. If a group defines a load-balancing policy, it is called a load-balancing group (a load-balancing group can also be a replication group and a failover group). If a space belongs to a failover group and a load-balancing group, it must be the same group. If there is a space failure in the group, load-balancing will continue among the space members in the group (as long as there is at least one live space in the group) according to the load-balancing policy.
For details about scaling a running space cluster in runtime see the Elastic Processing Unit section.