HP StorageWorks XP24000/XP20000 LUN Manager User Guide (T5214-96092, May 2011)

If the host is not configured for authentication by host groups with CHAP, the authentication
fails and the host cannot connect to the storage system.
◦ If the user information for the host is registered on the host group, but authentication of
the host is disabled (Case B):
The host group does not perform authentication of the host. The host will connect to the
storage system without authentication, regardless of whether or not the host is configured
for authentication by host groups with CHAP.
◦ If the user information for the host is not registered on the host group (Case C):
Irrespective of the setting on the host, the host group performs authentication of the host,
but results in failure. The host cannot connect to the storage system.
• When connecting via a host group that does not perform authentication of hosts (Case D):
The host will connect to the storage system without authentication of the host, regardless of
whether or not the host is configured for authentication by host groups with CHAP.
In this case, you need not register the user information for the host on the host group, but you
can register it.
Notes: You should register user information for all hosts to be connected to a host group that
performs authentication of hosts. To allow a specific host to connect to such a host group without
authentication, configure the host group and the host as follows:
On the host group: Register the user information for the host you want to allow to connect without
authentication, and then, disable the authentication setting of the host.
“Example of Authentication of Hosts” (page 45) shows an example of authentication of hosts. In
this figure, WWNs of host bus adapters (HBAs) are abbreviated as a, b, and so on.
44 Performing LUN Manager Operations