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

Browse to the cluster in the vSphere Web Client navigator.

2

Click the Manage tab.

3

Click Settings, and click Rules.

4

Click Add.

5

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

6

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.

7

Click Add.

8

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

9

Click OK.