Perform the following tasks to configure I/O fencing to prevent data corruption in the event of a communication failure.
See About I/O fencing in campus clusters
See Veritas Cluster Server Installation Guide for more details.
To configure I/O fencing to prevent data corruption
You can extend the DWDM to the third site to have FC SAN connectivity to the storage at the third site. You can also use iSCSI targets as the coordinator disks at the third site.