HP 3PAR RedHat and Oracle Linux Implementation Guide

NOTE: The sysfsutils-xx package contains the libsysfs.so.1 library. If any upgrades
are made to this package, the new library file should be copied over to the /lib directory.
Modifying the /etc/multipath.conf File
The /etc/multipath.conf file is used by Device-mapper where the multipathing parameters
have been set. The default installed /etc/multipath.conf file must be edited with the following
changes for a minimum configuration connecting to an HP 3PAR StoreServ Storage array. Entries
listed in multipath.conf override the default kernel parameters for dm-multipath. In general,
the kernel defaults are sufficient with the exception of the devices entries for HP 3PAR. In the specific
case of booting the host from an HP 3PAR StoreServ Storage volume (a.k.a SAN boot), there are
additional defaults entries required:
NOTE: See “Booting the Host from the HP 3PAR StoreServ Storage” (page 126) for SAN boot
requirements.
See the RHEL document DM Multipath Configuration and Administration for additional options in
multipath.conf entries. Search the following website for the appropriate version of this
document:
Red Hat
1. Remove or comment out all entries in the /etc/multipath.conf file except for the devices
section of devices currently in use.
2. Edit the devices structure to add entries for HP 3PAR array and remove other product entries
that are not needed.
After all of the edits are made, the relevant sections of /etc/multipath.conf should
appear as follows if the HP 3PAR array that the RHEL server is connecting to is running HP 3PAR
OS 3.1.1 or 3.1.2:
For RHEL 6.2 or Later
# cat /etc/multipath.conf
defaults {
polling_interval 10
max_fds 8192
}
devices {
device {
vendor "3PARdata"
product "VV"
no_path_retry 18
features "0"
hardware_handler "0"
path_grouping_policy multibus
getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n"
path_selector "round-robin 0"
rr_weight uniform
rr_min_io_rq 1
path_checker tur
failback immediate
}
}
50 Configuring a Host with Fibre Channel