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HP 3PAR Host Explorer User Guide
3.7 The Host Explorer Enclosure Device LUN
When a host is connected to an HP 3PAR Storage System, an enclosure device with LUN ID 254
is automatically defined for the host. The HP 3PAR Host Explorer uses this enclosure device to
exchange information about the host with the storage system. The LUN with ID 254 acts as
both a data LUN and an enclosure service LUN. You can use LUN ID 254 for any application with
limited impact on performance. The level of impact on performance depends on the
application. The LUN with ID 254 is presented to the host even when no virtual volumes are
exported to the host, or when the host is not configured on the storage system.
3.7.1 Storage System Upgrades and Enclosure Devices
If you upgraded tfrom a version of the InForm OS released before 2.3.1, you must consider the
following notes about LUNs with ID 254.
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If you had a LUN with ID 254 before you upgraded the InForm OS, the host persona for the
host is set to the Generic-Legacy persona number 6 during the upgrade process. The port
persona number must be reset to Generic persona number 1 before the Host Explorer can
communicate with the storage system.
1) Use the InForm Command Line Interface (CLI) sethost –persona 1
command to set the host persona number to 1.
2) Use the controlport offline command to take the HP 3PAR Storage System port
the host is connected to offline.
3) Use the controlport rst command to reset the HP 3PAR Storage System port
connected to the host.
Alternatively, if you reboot the host after resetting the persona number as described in
step 1, the Host Explorer automatically discovers the enclosure device on LUN ID 254 and
sends the information to the storage system. For more information about CLI commands,
see the HP 3PAR InForm OS CLI Administrator’s Manual.
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If you add a host after you upgraded the InForm OS, the host persona number for the host
must be set to 1. For more information about creating and modifying hosts, see the HP
3PAR InForm OS CLI Administrator’s Manual.
You can also use the InForm Management Console to configure and administer hosts
connected to the storage systems. For more information, see the HP 3PAR InForm OS
Management Console Online Help.
The Host Explorer Enclosure Device LUN
3.3
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Software - HP 3PAR Host Explorer Software E-Media Kit (84 kb)
Software - HP 3PAR Host Explorer Software Media Kit (84 kb)