System replication is a key technology in this design as it supports both disaster recovery, e.g. data center or site failure, and fault recovery, e.g. hardware failure.
We have just completed a series of video tutorials for the SAP HANA Academy that cover a wide range of topics related to system replication. You can find the full playlist here: SAP HANA System Replication – YouTube
The first video briefly discusses system replication concepts, RPO, RTO, etc.
The next video demonstrates how to setup replication using SAP HANA studio or the command line tool HDBNSUTIL.
The next video explains the different replication modes and the full synch option.
In the next video, the different configuration parameters are discussed.
The next video, demonstrates how to properly disable system replication.
As discussed in SAP Note 1945676 – Correct usage of hdbnsutil -sr_unregister this needs to be done in the correct sequence.
The next video, demonstrates how to perform a takeover.
For a decision guideline, see SAP Note: 2063657 – HANA System Replication takeover decision guideline
Near Zero Downtime Upgrade
The next demonstrates how you can use system replication for near zero downtime upgrades. I will show you how you can upgrade your secondary system from revision 90 (SPS 09) to revision 91, perform a takeover to the secondary, upgrade old primary, and reestablish the replication. Although not complicated, near zero downtime upgrades does require to perform the steps in the right order and using the correct command options.
How to setup and manage system replication is documented in the SAP HANA Administration Guide (Chapter 4, Availability and Scalability)
Thank you for watching
You can view more free online videos and hands-on use cases to help you answer the What, How and Why questions about SAP HANA and the SAP HANA Cloud Platform on the SAP HANA Academy at youtube.com/saphanaacademy, follow us on Twitter @saphanaacademy., or connect with us on LinkedIn.