You can use access control to restrict access from hosts and SAN Volume Controller clusters. You do not need to use access control to allow a SAN Volume Controller cluster to use all of the defined logical units on the system.
The following table lists the access control methods that are available:
| Method | Description |
|---|---|
| Port Mode | Allows access to logical units that you want to define on a per storage controller port basis. SAN Volume Controller visibility (through switch zoning, physical cabling, etc.) must allow the SAN Volume Controller cluster to have the same access from all nodes and the accessible controller ports have been assigned the same set of logical units with the same logical unit number. This method of access control is not recommended for SAN Volume Controller connection. |
| WWN Mode | Allows access to logical units using the WWPN of each of the ports of an accessing host device. All WWPNs of all the SAN Volume Controller nodes in the same cluster must be added to the list of linked paths in the controller configuration. This becomes the list of host (SAN Volume Controller) ports for an LD Set or group of logical units. This method of access control allows sharing because different logical units can be accessed by other hosts. |