In this scenario, hosts at the sites lose connectity to the storage at each others' sites. For example, hosts in Site A lose connectivity to the storage at Site B, and hosts in site B lose connectivity to the storage at Site A. For example, this might occur because the link between the fibre channel (FC) switches went down.
To recover, reconnect the FC links. If the vxattachd daemon is running, it automatically reattaches the detached site and initiates recovery. Otherwise, manually run the vxreattach and vxrecover commands to bring the site back to ACTIVE.