After defining the storage partition topology, you can begin to assign logical drive access to the host groups or hosts defined in the Topology View of the Mappings View window.
Typically, logical drive access is defined by assigning a logical drive-to-LUN mapping using the Storage Partitioning Wizard, allowing you to grant a host group or host access to a particular logical drive (or a number of logical drives) in the storage subsystem. To learn more about the Wizard, see A Preview of the Storage Partitioning Wizard.
Important:
Each host has its own LUN address space, and will therefore allow the same LUN to be used by different host groups or hosts to access logical drives in a storage subsystem.
You can define one logical drive-to-LUN mapping for each logical drive in the storage subsystem.
Logical Drive-to-LUN mappings are shared between controllers in the storage subsystem.
The same LUN may not be used twice by a host group or host to access a logical drive. A unique LUN must be used.
If the storage subsystem is directly managed and has the Access Logical Drive mapping assigned to the Default Group, the Access Logical Drive mapping will be assigned to every host created from the Default Group. To stop this from happening, delete the Access Logical Drive mapping from the Default Group before creating hosts. For more information, see Deleting a Host Port, Host, Host Group, or Logical Drive Mapping.
Granting Logical Drive Access to Host Groups
In the following example, three storage partitions have been defined.
The first storage partition consists of Logical Drive Financial. This logical drive is accessed by Host KC-B using LUN 5. Even though Host KC-B is part of the logical Host Group Kansas City, Host KC-A cannot access this logical drive because the logical drive-to-LUN mapping was created with Host KC-B rather than the Host Group Kansas City.
The second storage partition consists of Logical Drives Legal and Engineering. These logical drives are accessed by Hosts KC-A and KC-B in Host Group Kansas City using LUNs 2 and 4, respectively.
The third storage partition consists of Logical Drives Marketing and H Resources. These logical drives are accessed by Hosts Omaha A and B in Host Group Omaha using LUNs 7 and 2, respectively.
Granting Logical Drive Access to Hosts
In the following example, Host Omaha has been granted access to Logical Drive Legal through LUN 6 using either of its host ports. Host Kansas City has been granted access to Logical Drive Financial through LUN 6 and Logical Drive Engineering through LUN 7 using either of its host ports. Note that the same LUN (LUN 6 in this example) can be used for logical drive access for both hosts (Omaha and Kansas City), because each host has its own LUN address space.
A Preview of the Storage Partitioning Wizard
The following introduces the screens you will encounter when using the Storage Partitioning Wizard:
The Introduction screen of the Wizard describes the process of creating a storage partition, and reminds you that the required logical drives and host groups and/or hosts must be created before continuing the Wizard.
The Select Host Group or Host screen enables you to select a single host group or host for which access is to be defined.
The Select Logical Drives/LUNs screen guides you through the process of selecting a logical drive, then assigning a LUN that the host group or host will use to access the logical drive. The Wizard is completed on this screen.
Reconfiguring Logical Drive-to-LUN Mappings
A logical drive-to-LUN mapping is reconfigurable. You can: