HP 3PAR AIX and IBM Virtual I/O Server Implementation Guide

No_reserver If you set HP 3PAR devices with this reservation policy, no reservation is made
on the devices. A device without reservation can be accessed by any initiator
at any time. I/O can be sent from all the paths of the HP 3PAR device. This
is the default reservation policy of HP 3PAR MPIO 2.2 and HP 3PAR ODM
3.1.
Single_path If you set this reservation policy for HP 3PAR MPIO devices, only the
fail_over path selection algorithm can be selected for the devices. With
this reservation policy, all paths are open on an HP 3PAR device; however,
only one path makes a reservation on the device. I/O can be sent only through
this path.
PR_exclusive With this reservation policy, a persistent reservation (PR) is made on the HP
3PAR device with a PR key. Any initiators that register with the same PR key
can access the device. Normally, you should pick a unique PR key for a server.
Different servers should each have a different, unique PR key. I/O is routed
to all paths of the MPIO device, because all paths of an MPIO device are
registered with the same PR key.
NOTE: The PR_shared reservation policy is not supported by HP at this time.
NOTE: For AIX installs in other than en_US language convention, you must move an ODM file
to enable the OS to correctly display the HP 3PAR VV label on the hdisk instance. Use the following
command to copy the file to the appropriate location.
cp /usr/lib/nls/msg/en_US/3par.cat /usr/lib/methods/3par.cat
and
cp /usr/lib/nls/msg/en_US/3par.cat /usr/lib/nls/msg/X/3par.cat
Where “X” is the language convention used at the time of installation.
Connecting the Host Server with a Fibre Channel Reservation Policy 27