SAP HANA System Replication (Scale-Up) X
SAPHanaSR - Tools for automating SAP HANA system replication in scale-up setups.
The SAPHanaSR package provides resource agents (RA) and tools for setting up and managing automation of SAP HANA system replication (SR) in scale-up setups. System replication will help to replicate the database data from one site to another site in order to compensate for database failures. With this mode of opera- tion, internal SAP HANA high-availability (HA) mechanisms and the Linux cluster have to work together.
The SAPHana RA performs the actual check of the SAP HANA database instances and is configured as a master/slave resource. Managing the two SAP HANA instances means that the resource agent controls the start/stop of the instances. In addition the resource agent is able to monitor the SAP HANA databases on landscape host configuration level. For this monitoring the resource agent relies on interfaces provided by SAP. As long as the HANA landscape status is not "ERROR" the Linux cluster will not act. The main purpose of the Linux cluster is to handle the take-over to the other site. Only if the HANA landscape status indicates that HANA can not recover from the failure and the replication is in sync, then Linux will act.
An important task of the resource agent is to check the synchronisation status of the two SAP HANA databases. If the synchronisation is not "SOK", then the clus- ter avoids to takeover to the secondary side, if the primary fails. This is to improve the data consistency.
Note: To automate SAP HANA SR in scale-out setups, please use the package SAPHanaSR-ScaleOut.
File structure
* `SAPHana` directory for Scale-Up ** `ra` contains the actual resource agents, `SAPHana` and `SAPHanaTopology`; ** `tools` contains the Perl auxiliary library and tools