Home > Workload Solutions > SAP > Guides > DVD for High Availability with Red Hat Pacemaker Clusters Running SAP HANA on Dell S5000 Series Servers > Cluster architecture
The SAP landscape consists of a highly available active/passive SAP HANA cluster, as shown in the following figure:
Several availability strategies protect against disasters. Dell SAP engineering used a two-node Red Hat Enterprise Linux Server pacemaker cluster with SAP HSR instead of switching a single database instance over to the secondary host. Choose the best option for your environment based on your system's availability requirements.
Using the “syncmem” replication mode, the Dell engineering team achieved failover times in the order of seconds. This was a faster time than a complete database startup requiring the transfer of the data disks to the other host.
Note: This cluster configuration is not a substitute for a standard backup. This configuration does not prevent data loss when data is accidentally deleted from the database.