HP 3PAR RedHat and Oracle Linux Implementation Guide

hardware_handler "0"
path_grouping_policy multibus
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_selector "round-robin 0"
rr_weight uniform
rr_min_io 100
path_checker tur
failback immediate
polling_interval 10
}
}
NOTE: If the HP 3PAR array that the RHEL server is connecting to is running an HP 3PAR
OS version earlier than 3.1.1, you must change the no_path_retry setting to 12 rather
than 18, and the polling_interval setting to 5 rather than 10.
If the HP 3PAR array that the RHEL server is connecting to is running an HP 3PAR OS 3.1.3
or later, host persona 2 (ALUA) is recommended. When host persona 2 is used, you must
modify the /etc/multipath.conf file for ALUA support.
When changing from HP 3PAR host persona 1 to host persona 2 or vice versa:
• A change from persona 1 to persona 2, or from persona 2 to persona 1, requires that
the array ports affected be taken offline, or that the host for which the persona is being
changed be not connected (not logged in). This is an HP 3PAR OS requirement.
• For existing devices targeted in a persona to be claimed, the host must be rebooted.
Use the following procedure:
a. Stop all host I/O and modify the /etc/multipath.conf file on the RHEL host.
b. Shut down the host.
c. Change the host persona on the array.
d. Boot the host.
e. Verify that the target devices have been claimed properly and that the persona setting is
correct.
In addition, a SAN boot configuration requires rebuilding of the ramdisk in order to take
effect.
52 Configuring a Host with Fibre Channel