DRS does not move any virtual machines onto a host.
DRS does not recommend migration of virtual machine to a host that has been added to a DRS-enabled cluster.
After a host has been added to a DRS-enabled cluster, the virtual machines deployed to the host become part of the cluster. DRS can recommend migration of some virtual machines to this host just added to the cluster. If that does not occur, there may be problems with vMotion, host compatibility, or affinity rules. The following are possible reasons:
vMotion is not configured or enabled on this host.
Virtual machines on other hosts are not compatible with this host.
The host does not have sufficient resources for any virtual machine.
Moving any virtual machines to this host would violate a VM/VM DRS rule or VM/Host DRS rule.
This host is reserved for HA failover capacity.
A device is mounted to the virtual machine.
The vMotion threshold is too high.
DRS is disabled for the virtual machines, hence the virtual machine could not be moved onto the destination host.
Address the issue that prevents DRS from moving virtual machines onto a host.