Make sure that the following physical data paths are connected and configured:
- From the primary storage system to the secondary storage system: two or more paths
- From the secondary storage system to the primary storage system: two or more paths
- From the primary storage system to the external storage system: two or more paths
- From the secondary storage system to the external storage system: two or more paths
- From the host to the primary storage system: two or more paths
- From the host to the secondary storage system: two or more paths
The following figure shows the physical data paths (redundant paths not shown). Although only one path is required for each location, it is important that you connect the storage systems using at least two physical paths. If you connect nodes using only one physical path, an unexpected failover might occur in the server, or the GAD pairs might be suspended, even though only one path or hardware failure has occurred. When maintenance is performed on the physical paths between storage systems, the GAD pairs must be suspended.