Introduction
High Availability (HA) ensures a system remains operational despite internal failures, allowing IT maintenance on Infrastructure, OS, and application level without business user disruption. This 24/7 accessibility is achieved by eliminating single points of failure, typically aiming for 99.99% uptime. In SAP, HA is often implemented through server clustering, storage replication with each method varying by product.
For example, Red Hat HA utilizes server clustering and resources like Virtual IPs, STONITH, ASCS/SCS, ERS and Database resources to manage master/slave roles. Windows clustering achieves HA by moving quorum disks between servers. While SUSE, RHEL, and Windows are well-known SAP HA options, other SAP-certified solutions exist, which is mentioned below,
Environment
SAP NetWeaver and HANA.
Available options by products
| Sl.No | Vendor | Product Name |
| 1 | Red Hat | Pacemaker cluster |
| 2 | SUSE | Pacemaker cluster |
| 3 | Microsoft | Windows server Failover cluster |
| 4 | Fujitsu | Dynamic Infrastructure Solutions for SAP(FlexFrame) |
| 5 | IBM | System z |
| Power System on AIX |
| Power System on Linux |
| IBM i |
| 6 | NEC | Expresscluster |
| 7 | Oracle | Oracle Solaris Cluster |
| SAPCTL with Oracle Clusterware and Oracle Real Application Clusters |
| 8 | ProLion | ClusterLion for SAP |
| 9 | Veritas Technologies LLC | InfoScale Enterprise |
Reference - #https://help.sap.com/docs/SUPPORT_CONTENT/si/3362959203.html
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