The key to a Disaster Recovery investment is being able to test and failover i.e. check that it actually works. Hence it is vital that the SAN that is being used for this replication be optimized and provide a RTO that meets with the business’ demands. While there are sufficient tools to monitor the IP or DWDM links for cross site replication, it is still best practice to TAP at the replication links for your Disaster Recovery infrastructure to incorporate the monitoring of the FC SAN.
Here's what was my final video for Virtual Instruments that quickly explains how you can proactively take out the "Disaster" from Disaster Recovery....