HP XP Array Manager Software - Manual (Page 46)

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.
Figure 24 on page 46 shows an example of authentication of hosts. In this figure, WWNs of host bus
adapters (HBAs) are abbreviated as a, b, and so on.
Figure 24 Example of Authentication of Hosts
In Figure 24 on page 46, host group 1 performs authentication of hosts, but host group 2 does not.
The user information for Host A is registered on host group 1, and the authentication setting is enabled.
Therefore, if authentication of the host is successful, Host A can connect to the storage system (or,
the processing goes on to the authentication of the host group). As a precondition of successful
authentication, Host A should be configured for authentication by host groups with CHAP.
46 Performing LUN Manager Operations