The following script will accept a vCenter and two datastores as input, and move VMs from the source to the destination one at a time. The requirement for this script was to perform the migration without babysitting, but to not overwhelm the storage infrastructure by kicking off tons of VMs at once.
Here’s the script – feel free to modify or copy! Load it by running the .ps1 file, then use the Migrate-DS command to perform the migration.