In a scalable operation, the clustered system is designed for performance improvement and degraded operation when a failure occurs by means of parallel processing on multiple server machines. In contrast to the standby operation, nodes in the scalable operation are not divided into active and standby nodes. If one server in a clustered system fails, the remaining servers in the clustered system operate at a degraded level so that the transaction continues.
Figure 1.6 Scalable Operation
