MGN - Source disks getting resized

In MGN migration, before installing MGN Replication agent if the disk size is 100 GB and after installing MGN Replication agent if in case the Source disk is expanded from 100 GB to 200 GB. What will happen to the ongoing MGN replication ? How does MGN know that the Source disk has been expanded in size ? What action needs to be taken inorder to replicate the data from the expanded Source disk.