Availability sets keep virtual machines separate from each other so they do not run on the same host whenever possible. If you create an availability set in SCVMM for two different virtual machines, SCVMM attempts to keep those virtual machines on separate hosts and avoids placing them on the same host. Availability sets implement this by defining anti-affinity rules within a Hyper-V host cluster or in standalone hosts.

VRAs are defined with affinity rules to prevent their migration. Do not change these affinity rules.

During a recovery operation, when new virtual machines are created in the recovery site, migration of these virtual machines is prevented by Zerto-defined affinity rules. Once the recovery process is complete, the affinity rules are deleted and these virtual machines can be migrated.