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138 Configuration: Disk Groups and Virtual Disks
Guidelines when you work with host types with LUN mapping restrictions:
• You cannot change a host adapter 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 Default Group 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 virtual disks in the Default Group with LUNs within its limits. For
example, if the Default Group had two virtual disks mapped to LUNs 254
and 255, the host with the restricted host type would not be able to access
those two virtual disks.
• 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 virtual disks 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 Array Change Default Host Type.
If you set the default host type to a host type that is restricted, the maximum
number of LUNs allowed in the Default Group for any host
is 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.
book.book Page 138 Thursday, December 9, 2010 3:20 PM