Architecture decisions for resiliency

Architecture decisions for resiliency

The following sections summarize the resiliency architecture decisions for resiliency for the SAP on VPC pattern.

Architecture decisions for high availability

Architecture decisions for High Availability (HA)
Architecture decision	Requirement	Decision	Rationale
High Availability HANA	Provide 99.95% availability for HANA database	HANA System Replication (HSR)	Enabling HANA HSR addresses SAP HANA outage reduction due to planned maintenance, faults, and disasters. It supports a recovery point objective (RPO) of 0 seconds and a recovery time objective (RTO) measured in minutes.
High Availability infrastructure	Provide 99.95% availability for infrastructure	Redundant VSIs in an SAP Scale-out deployment with Application Load Balancer for VPC (ALB) solution on a single-zone can provide an application SLA of 99.95% Auto Scale for VPC (optional)	Minimize cost, implementation and maintenance complexity, potential latency and maximize value with IBM® solutions.
High Availability infrastructure (SAP on DB2)	Provide 99.9% availability for infrastructure	Using IBM Db2 HADR with integrated Pacemaker cluster	Stringent SLA requirements, automated failover using Pacemaker

Architecture decisions for disaster recovery

Architecture decisions for Disaster Recovery (DR)
Architecture decision	Requirement	Decision	Rationale
Disaster Recovery for application and infrastructure	Disaster recovery capability in secondary region	Veeam	Support for databases (HANA, Oracle, or MSSQL). DR capability for RPO < 15 min, RTO < 4 hours. Veeam service seamlessly integrates directly with IBM Cloud VPC to help achieve high availability. This service provides recovery points and time objectives for SAP application servers. Controls both the backups and restores of all virtual machines (VMs) for SAP applications directly from the Veeam console.
Disaster Recovery for HANA	HANA disaster recovery capability in secondary region	Hana System Replication (HSR)	Continuous replication of data from a primary to a secondary system in a separate region, including in-memory loading. System replication facilitates rapid failover due to a disaster

Architecture decisions for backup and restore

Architecture decisions for backup and restore
Architecture decision	Requirement	Decision	Rationale
Backup (SAP)	Back up of NetWeaver and HANA data	SAP NetWeaver(NW) file level backup SAP NetWeaver(NW) storage snapshot SAP HANA file level backup SAP HANA storage snapshot	Minimize cost and operational ease by using SAP Native tools like DBACOCKPIT, HANACOCKPIT, and Backint. The tools are used to take SAP Database backup.
IBM cloud Backup and Recovery	Infrastructure backups	VPC VSIs (File, OS , Apps)	Application consistent, centralized policy and restores, no backup infra to manage
Backup for VPC infrastructure	Infrastructure backups	Veeam for snapshot backups at VM/BM level.	The backups are integrated with IBM Cloud native backup solution of Veeam by using the API that's available to store the backup in the IBM Cloud Object Storage.