DRS affinity rules

DRS affinity rules are used in DRS clusters to control the placement of virtual machines. Three types of rules are available:

  • affinity rules – DRS will try to keep certain VMs together on the same host. These rules are often used in multi-virtual machine systems to localize the traffic between virtual machines.
  • anti-affinity rules – DRS will try to keep certain VMs are not on the same host. These rules are often used to keep the VMs separated for availability reasons.
  • VM to host rules – specify whether VMs can or can’t be run on a host. They can be preferential or required. These rules are used in conjunction with DRS groups for ease of administration. A DRS group can either consist of one or more VMs or one or more ESXi hosts.

 

If two rules are in conflict with each other, they will not be enabled.
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