Many are able to map up to 256 (0 to 255) per . However, the maximum number of mappings differs because of operating system variables, failover driver issues, and potential
data problems. The hosts listed in the table have these restrictions.
Important:
If you try to map a to a LUN that exceeds the restriction on these operating systems, the host is unable to access the logical drive.
Operating System
Highest LUN
Windows Server 2003 and Windows Server 2008
255
Solaris
255
HP-UX 11.23 and 11.31
127
AIX
1000+
Linux
255
Keep these guidelines in mind when you work with host types with LUN mapping restrictions:
You cannot change an HBA host port to a restricted host type if there are already mappings in the storage partition that would
exceed the limit imposed by the restricted host type.
Consider the case of the that has access to LUNs up to 256 (0 to 255) and a restricted host type is added to the Default Group. In this case, the
host that is associated with the restricted host type is able to access logical drives in the Default Group with LUNs within
its limits. For example, if the Default Group had two logical drives mapped to LUNs 254 and 255, the host with the restricted
host type would not be able to access those two logical drives.
If the Default Group has a restricted host type assigned and the storage partitions are disabled, you can map only a total
of 32 LUNs. Any additional logical drives that are created are put in the Unidentified Mappings area. If additional mappings
are defined for one of these Unidentified Mappings, the Define Additional Mapping dialog shows the LUN list, and the Add button is unavailable.
Do not configure dual mappings on a Windows host.
If there is a host with a restricted host type that is part of a specific storage partition, all of the hosts in that storage
partition are limited to the maximum number of LUNs allowed by the restricted host type.
You cannot move a host with a restricted host type into a storage partition that already has LUNs mapped that are greater
than what is allowed by the restricted host type. For example, if you have a restricted host type that allows only LUNs up
to 31, you cannot move that restricted host type into a storage partition that has LUNs greater than 31 already mapped.
The Default Group on the Mappings tab has a default host type. You can change this type by selecting Storage Subsystem >> Change >> Default Host Type. If you set the default host type to a host type that is restricted, the maximum number of LUNs that are allowed in the Default
Group for any host are restricted to the limit imposed by the restricted host type. If a particular host with a non-restricted
host type becomes part of a specific storage partition, you are able to change the mapping to a higher LUN.