Configuring Hyper-V Replica Resynchronization
If you have Hyper-V Replica enabled on a virtual machine, and Hyper-V is not able to send all disk changes across in a timely fashion, the replication relationship will eventually be put into a failed state. At this point in time you need to perform a resynchronization to get the replication relationship back to normal.
We do allow you to configure for automatic resynchronization – like this:
To learn more and to read the entire article at its source, please refer to the following page, Configuring Hyper-V Replica Resynchronization- Virtual PC Guy’s WebLog