User`s guide

Chapter 2. IBM TotalStorage Enterprise Storage Server configuration 163
There are two Fibre Channel Access Modes to which the ESS can be configured:
򐂰 Access_Any
In Access_Any mode, any host FC port that is not defined in the ESS
Specialist, can access all non-AS/400, ESS logical volumes. In Access-Any
mode, the ESS Specialist displays an anonymous pseudo-host FC port icon,
which is shown in Figure 2-119 and which is taken from another ESS,
because the one we used here is configured for Access_Restricted. An
anonymous host FC port is not a real host FC port in disguise and connected
to the storage server. It represents all host FC ports (if any) that are
connected to the ESS and that are not configured on the ESS. The
anonymous host FC ports do not have an access profile defined. You can
access specific ESS logical volumes that are defined in the ESS, by host FC
ports that are not identified by the ESS.
򐂰 Access_Restricted
In Access_Restricted mode, a connected host FC port, which is not
configured with the WWPN, cannot access any ESS logical volume. When
this host FC port gets configured by using the WWPN, it will only see the
volumes for which it is configured. Once a host FC port is configured, there
are no differences.
Figure 2-119 Anonymous host FC port icon in an ESS configured for Access_Any
Understanding access profiles
Whichever access mode is chosen, any host FC port that has an access profile
can access only those volumes that are defined in the profile. Depending on the
capability of the particular host operating system, an access profile can contain
up to 256 or up to 4096 volumes.
The setup of an access profile is transparent to the user when using the ESS
Specialist to configure the host FC ports and ESS logical volumes in the ESS.
Configuration actions that affect the access profile are:
򐂰 Configuring the host FC port in the ESS with its WWPN creates the access
profile for that host FC port. Initially the profile is empty. That is, it contains no
ESS logical volume assignments. The host FC port cannot access any ESS
logical volumes that are already defined in the ESS.