For MSCS virtual machines in a cluster, you must create VM-VM affinity or anti-affinity rules. VM-VM affinity rules specify which virtual machines should be kept together on the same host (for example, a cluster of MSCS virtual machines on one physical host). VM-VM anti-affinity rules specify which virtual machines should be kept apart on different physical hosts (for example, a cluster of MSCS virtual machines across physical hosts).

For a cluster of virtual machines on one physical host, use affinity rules. For a cluster of virtual machines across physical hosts, use anti-affinity rules.

1

In the vSphere Client, right-click the cluster in the inventory and select Edit Settings.

2

In the left pane of the Cluster Settings dialog box under vSphere DRS, select Rules.

3

Click Add.

4

In the Rule dialog box, type a name for the rule.

5

From the Type drop-down menu, select a rule.

For a cluster of virtual machines on one physical host, select Keep Virtual Machines Together.

For a cluster of virtual machines across physical hosts, select Separate Virtual Machines.

6

Click Add.

7

Select the two virtual machines to which the rule applies and click OK.

8

Click OK.