HP StorageWorks Auto Path XP for AIX V04.40-/B Installation Guide (B7949-96009, November 2004)

14 HP StorageWorks Auto Path for AIX: Installation Guide
Installing Auto Path in AIX environments
Before beginning installation, configure the AIX environment for Auto
Path support, conforming to the following requirements:
• Make sure you have a license key or a license file containing a license
key.
• After you create DLM devices, use only dlm commands for these
devices. Do not use standard operating system commands. For
example, use /usr/DynamicLinkManager/bin/dlmmkvg instead of
/usr/sbin/mkvg.
• After creating a volume group on a DLM device, do not reference the
underlying hdisk (as displayed with the lsdev command).
Auto Path can be configured to issue an error when the underlying
hdisk is referenced using the dlmodmset command. See the Hitachi
Dynamic Link Manager User’s Guide for more information.
• Persistent reservation must be disabled when using Auto Path with a
Continuous Access Storage Appliance (CASA).
All paths to the same LUN must have the same type of HBA with identical
firmware.
Caution If you combine different types of HBAs, Auto Path may not be able to switch
the path when an error occurs.
• Auto Path cannot be used to manage the boot disk.
• Uninstall any versions of Auto Path older than 04.02 before installing
the current software version. See “Upgrading to version 04.40-/B” on
page 21.
• Auto Path cannot be used to manage command devices used by RAID
Manager.
Recommendation Use the same type of fiber switch for all paths.