Native SAP HANA HA Support
SAP provides a set of native HA support to recover the SAP HANA system from various faults.
Service Auto-Restart
In the event of a software failure or an intentional intervention by an administrator that disables one of SAP HANA services, the service will be restarted by the SAP HANA service auto-restart watchdog function, which automatically detects the failure and restarts the stopped service process. Upon restart, the service loads data into memory and resumes its function. SAP HANA service auto-restart can be used right out of the box for fault recovery, which works the same way on the HUAWEI CLOUD as on other platforms.
Host Auto-Failover
This solution requires that SAP HANA be installed on multiple nodes (at least two), including one master node, several slave nodes, and one or more standby nodes. When a single point of failure occurs on the primary node or slave node, the standby node can identify and automatically switch from the standby state to the active state to replace the failed node.
HANA System Replication (HSR)
System replication is available in every SAP HANA installation offering HA and DR support. A secondary system is set up to copy data and transaction logs from the primary system. Once a fault occurs in the primary system, the secondary system is enabled to take over operations from the primary system. In addition, HSR allows you to have a variety of settings, depending on your requirements for recovery time objective (RTO) and database recovery point objective (RPO). For details, see How to Perform System Replication for SAP HANA released by SAP.
Backup and Recovery
Although SAP HANA is an in-memory database, all data modifications are saved in a persist storage system. Therefore, even if a sudden power outage occurs, SAP HANA can restore data and ensure data integrity. In addition, to restore data after a disaster occurs, data and database logs in the storage system must be backed up to a remote end, for example, OBS bucket. For more details about SAP HANA database backup and recovery, see Backup and Recovery - SAP HANA released by SAP.
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