DRS Affinity and Anti-Affinity rules are automated mechanisms to keep VMs on separate clustered hosts or to keep them together on the same host. This is a great unsung technology with one caveat: Only 2 VMs may be included per rule. In other words, if you need a rule for 3 VMs, create multiple rules which grow exponentially as VMs are added. This caveat was resolved in vSphere 4.1; rules can be created with many VMs.
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