Use this option to grant logical drive access to a particular host group and/or host and to define the logical unit number (LUN) that should be used to access it.
Important:
When you have defined a specific logical drive-to-LUN mapping for a host group or host that is currently under the Default Host Group, the host group or host moves out of the Default Host Group and under the Storage Subsystem (root) node indicating that the host group or host has a specific logical drive-to-LUN mapping. Once a specific logical drive-to-LUN mapping is defined for a host group or host, the host group or host no longer has access to the logical drives (if any) in the Default Host Group.
Example:
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In the example to the left, the host group St. Louis has been defined, but currently does not have any defined hosts, host ports, or specific logical drive-to-LUN mappings. Therefore, St. Louis is part of the Default Host Group and would automatically access the logical drives (if any) assigned to the Default Host Group. |
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In the example to the left, associated hosts and host ports have been defined for the St. Louis host group. Also, a specific logical drive-to-LUN mapping has been defined for the St. Louis host group. Therefore, the St. Louis host group moves from under the Default Host Group to under the Storage Subsystem in the Topology View. Now, each host in the St. Louis host group can access ONLY the logical drives that have been mapped to it. |
Important: This option will FAIL if:
How to Define a Logical Drive-to-LUN Mapping
1
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From the Storage Partition Definitions Window, select the Default Host Group, or a host group or host from the Topology View; then, select either the Configure >> Logical Drive-to-LUN Mappings >> Define New Mappings pull-down menu option or Define New Mappings from the right-mouse pop-up menu. Result: The Define New Mappings dialog is displayed. The selected node is listed on the dialog in the following form:
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2
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Select a single logical drive from the logical drive-to-LUN mapping table. The logical drive-to-LUN mapping table lists the names and unique logical drive identifiers (world-wide name) of the logical drives that are available for definition. Note: Logical Drives can only participate in one logical drive-to-LUN mapping. Logical Drives that have already been given a specific mapping do not appear in the logical drive-to-LUN mapping table. To change a logical drive-to-LUN mapping, use the Configure >> Logical Drive-to-LUN Mappings >> Change Mapping pull-down menu option. For more information, see Changing a Logical Drive-to-LUN Mapping. |
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3
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Select a single Logical Unit Number (0 through 31) from the LUN drop-down list box. Important: The full range of logical unit numbers is displayed because the same LUN can potentially participate in multiple mappings, because each host has its own LUN address space. However, a logical drive can only be mapped to a single LUN and a single host group or host. |
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4
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Select Apply to save the logical drive-to-LUN mapping and leave the dialog open. Select OK to save the logical drive-to-LUN mapping and close the dialog. Result: The logical drive-to-LUN mapping is saved. The Topology View is updated to reflect any movement of host groups or hosts from under the Default Host Group if this was the first specific logical drive-to-LUN mapping defined for the host group or host. The Mappings View is updated to reflect the addition of specific mappings. |