Filesystems that are actively migrating shadow data can be replicated using the
normal mechanism, but only the migrated data is sent in the data stream. As such,
the remote side contains only partial data that may represent an inconsistent state.
The shadow setting is sent along with the replication stream, so when the remote
target is failed over, it will keep the same shadow setting. As with restoring an
NDMP backup stream, this setting may be incorrect in the context of the remote
target. After failing over the target, the administrator can observe any errors and
correct the shadow setting as necessary for the new environment.