What Is SAP Application AS?

SAP application AS automatically increases or decreases the number of AASs based on the SAP service requirements of users. You can specify AS configurations and policies based on service requirements. These configurations and policies free you from having to repeatedly adjust resources to keep up with service changes and demand spikes, helping you reduce the resources and manpower required.

Figure 1 shows the mechanism of SAP application AS.

Figure 1 SAP application AS mechanism

Configure PAS and AAS in the same AS group, and AS policies based on alarm policies. You can set the CPU usage as a metric to configure alarm triggering policies, and customize the alarm triggering threshold. When the monitoring metric reaches the threshold, instances are automatically added in the silent installation mode to ensure proper service running.

**Table 1** Metric configuration
Metric	Description	Formula	Recommended Threshold
CPU usage	Indicates the CPU usage (%) of an AS group.	CPU usage of all instances in an AS group/Number of vCPUs of all instances in the AS group	85% NOTE: HUAWEI CLOUD monitors the ECS CPU usage every minute. If the CPU usage of ECSs in an AS group exceeds 85% for five consecutive times, scaling is triggered.