Witch two statements are true about High Priority vMotion requests in vSphere 5.x?
Migrations always proceed regardless of whether or not resources have been successfully
Migrations do not proceed if resources are not successfully reserved.
vCenter Server attempts to reserve resources on both the source and destination hosts to be shared among all concurrent migrations with vMotions.
vCenter Server attempts to reserve resources on both the source and destinations hosts for each individual High Priority migration with vMotion.
Page 135 from vsphere-esxi-vcenter-server-50-host-management-guide.pdf