Review any backup software tools messages about disk space issues. Snapshots of the virtual machine will impact storage vMotions if space on the LUN is less than 1.5 times the total of the VM's snapshots sizes. Confirm with your company storage team the LUN the virtual machine resides on has enough over head space to consolidate data and migrate. If not expand the current LUN where the virtual machine resides and consolidate the data. If the LUN can not expand space a clone of the Virtual Machines disk to another datastore is an option https://kb.vmware.com/s/article/1028042
The man page on the ESXI host use the command: vmkfstools -h
example syntax:
vmkfstools -i "/vmfs/volumes/currentDatastore/vm_name/vm_name.vmdk" "/vmfs/volumes/newDatastore/vm_name/vm_name.vmdk" -d thin -a buslogic