Home > Workload Solutions > SAP > Guides > Dell Validated Design for High Availability for SAP with VMware and SUSE on Dell Infrastructure > Configure VMware Fault Tolerance for the ASCS instance
To configure fault tolerance for the ASCS instance:
The VM is turned on automatically after approximately one minute.
This example assumes that the VMware cluster is evenly spanned over two data centers. Automate the placement of the virtual servers through VM and host rules so that each data center has at least one SAP HANA database and one SAP application server.
Define the host groups on the Configuration tab of the vSphere cluster object.
Affinity rules keep VMs in the correct data center by telling the vSphere dynamic resource scheduler (DRS) which virtual servers should run on which host group.
To create affinity rules:
This rule ensures that the virtual servers can be restarted in the second data center if the first data center is offline.
This step is similar to Step 1, but using VM-DC2 and DC2 as parameters.