The following functions support high availability (HA) in the SAP HANA system:
Enable the vSphere HA feature in a vSphere cluster with SAP HANA. If one of the hosts in the cluster fails, this feature restarts a VM on another host that has enough free resources.
Enable the SAP HANA service autostart feature in the SAP HANA software either at the time of the SAP HANA installation or by setting the autostart option to 1 in the /hana/shared/<SID>/profile/<SID>_HDB<InstNo>_<hostname> file.
Ensure that the minimum vSphere HA settings are in place, as shown in the following figure:
Figure 9. vSphere HA settings
The SAP HANA auto-restart watchdog function automatically detects a failure and restarts the corresponding SAP HANA process―nameserver, indexserver, and so on. This service monitors the SAP HANA application and the associated services within a VM.
The VMware HA VM monitoring feature “Guest not heartbeating” restarts the guest OS of the VM as well as SAP HANA on the same host. This feature handles operating system crashes if the SAP HANA auto-start options are enabled.
Enable the heartbeat monitoring feature when you enable vSphere HA. Dell EMC recommends setting Heartbeat monitoring sensitivity to High, as shown in the following figure:
Figure 10. Settings for VM monitoring
VMware Tools must be installed and running in the VM. You can install VMware Tools as part of the operating system (open-vm-tools) or by using the vSphere web client and selecting Guest OS > Install VMware Tools in the VM context menu.