Enterprise Readiness with SAP HANA – Storage & System Replication between data centers

Having covered the Build phase in our last blog on system replication within the data center, we will now cover in this blog the phase on running the data center. The run phase focuses on helping IT managers to operate and execute the data center readiness stages of disaster recovery, monitoring and administration, as well as security and auditing. In this blog, we will focus specifically on the storage and system replication technologies currently available for the IT manager.

Storage & System Replication

For large enterprises running multiple data centers, SAP HANA has two disaster recovery features: storage replication and system replication. These are based on the current offerings SAP HANA already has at the node level, which we covered in the previous blog. The table below provides a brief overview between the two offerings and their implications.

Enterprise Readiness with SAP HANA – Host Auto-failover, System Replication, Storage Replication

Continuing on from the earlier blog on Backup & Recovery that we covered last year, we will focus on the Building phase for data centers as we continue this topic in 2017. This segment will focus on what happens inside the data center, and specificically the high availability capabilities and options by SAP HANA, which can be deployed according to the IT managers’ landscape requirements. Of particular focus would be the System Replication feature, which will be explained in detail.

Enterprise Readiness with SAP HANA – Persistence, Backup & Recovery

Enterprise Readiness – Planning Your Data Center

As High Availability and Disaster Recovery become increasingly important topics for many enterprise customers embarking on digitization, we will be taking time to explain more on this topic in a blog series to help customers better plan and prepare their data center operations, with SAP HANA as the platform of focus.

We began this series with an earlier blog on Enterprise Readiness, and will continue with more topics in the following months.

Enterprise Readiness with SAP HANA

Data Centers as the “Power Plants” of the digital Economy

Data centers are the power plants of today’s businesses. However, planning high availability into a system landscape may often be an overlooked aspect by some businesses. As more elements ranging from devices, people, equipment and other systems become increasingly connected, the costs after an unplanned outage is definitely becoming more significant. In the always-on digital economy, companies that rely on data to make decisions, conduct transactions, and interact with consumers cannot afford data center blackouts.

SAP HANA TAKEOVER AND FAILBACK TEST

We have database on two different server melcoprd and melcodev. Our database is in mcod scenario in which it has 3 tenant database.

MELCODEV 

[HANA System Replication] end-to-end Client Reconnect

I've seen many posts on how to setup Hana System Replication and its takeover, however, none or few of the post that covers client reconnect after sr_takeover.

In order to ensure the client is able to find seamlessly the active HDB node (doesn't matter primary or secondary), we can either use IP Redirection or DNS Redirection. In this blog, i'll emphasize on simple IP redirection as it is much easier, faster and less dependancies compare to DNS redirection.

First of all, we need to identify a virtual hostname/ip, create them in your DNS. Below is the sample virtual hostname/ip and physical hostname/ip used:

Virtual IP/Hostname: [10.X.X.50 / hanatest]
Primary Physical IP/Hostname: 10.X.X.20 / primary1
Secondary Physical IP/Hostname: 10.X.X.21 / secondary2

Fail-Safe Operation of SAP HANA®: SUSE Extends Its High-Availability Solution

“SAP customers invest in SAP HANA” is the conclusion reached by a recent market study carried out by Pierre Audoin Consultants (PAC). In Germany alone, half of companies expect SAP HANA to become the dominant database platform in the SAP environment. In many cases, the “SAP Business Suite® powered by SAP HANA” scenario is already being discussed in concrete terms.

Naturally, SUSE is also accommodating this development by providing SUSE Linux Enterprise Server for SAP Applications – the recommended and supported operating system for SAP HANA. In close collaboration with SAP and hardware partners, therefore, SUSE will provide two resource agents for customers to ensure the high availability of SAP HANA system replications.