In case you have a group of virtual machines which you want to run together on one cluster node (e.g. they are communicating much faster through an internal vmware host network) you may achieve this by a cluster rule.
Just click on "Edit Settings" on the cluster's context menu:

Just click on "Edit Settings" on the cluster's context menu:

A window will open, click on "Rules" on the left:

"Keep virtual machines together" is the needed rule for our case.
Add affected virtual machines by "Add...". Click "OK" to valide the rule.
Result: When migrating a virtual machine from this rule to another cluster member/host, the other machines from this rule will migrate also/will follow the migration.

"Keep virtual machines together" is the needed rule for our case.
Add affected virtual machines by "Add...". Click "OK" to valide the rule.
Result: When migrating a virtual machine from this rule to another cluster member/host, the other machines from this rule will migrate also/will follow the migration.

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