HP Surestore Disk Array FC60 Storage Manager 60-NT Introduction Guide - Page 28

Configuring Storage Arrays Host Port A physical connection on the host adapter that resides within a host. When the host adapter only has one physical connection (host port), the terms host port and host adapter are synonymous. The host ports are automatically discovered by the storage management software. A host port is the actual physical connection that allows a host to gain access to the Storage Array. Therefore, if you want to define specific volume-to-LUN mappings for a particular host and create Storage Partitions, you must define its associated host ports. Initially, all discovered host ports belong to the Default Host Group and have access to any volumes that were automatically assigned default LUNs by the controller firmware during volume creation. Logical Unit Number (LUN) The number a host uses to access a volume. Each host has its own LUN address space. Therefore, the same LUN may be used by different hosts to access different volumes. However, a volume can only be mapped to a single LUN and a single host group or host. For example, Host 1 may access volume Engineering using LUN 5 and Host 2 may access volume Financial also using LUN 5. Default volume-toLUN mapping During volume creation, you can specify whether you want to have a default LUN mapping automatically assigned to the volume. When a host group or host is initially created it will be placed within the Default Host Group, and will have access to all of the default volume-to-LUN mappings. A host group or host can either access volumes with default mappings or specific mappings, but not both. Specific volume-toLUN mapping This mapping occurs when you select a defined host group or host in the Topology View and select the Define New Mapping option to assign a specific volume and logical unit number (volume-to-LUN mapping). This designates that only the selected host group or host has access to the particular volume through the assigned LUN. You can define one or more specific volume-to-LUN mappings for a host group or host. 28 CONFIGURING STORAGE ARRAYS