Installing The Dmm Multipath Driver - IBM System Storage DS3500 Introduction And Implementation Manual

Draft Document for Review March 28, 2011 12:24 pm
Regarding zoning configuration, ensure that:
– Multiple fibre channel HBA's within the same server must not able to discover the same
DS3500 controller port.
– Each fibre channel HBA are isolated from each other.
– Each fibre channel HBA must able to discover only one DS3500 controller. Not both.
An example of a zoning configuration for this environment is shown in Figure 20-36.
Figure 20-36 Zoning configuration sample applicable for this environment
In order to map the logical drive to the host and configure the zoning, it is necessary to
know the WWN of each device. To be able to get it, follow the procedure in the 20.3.1,
"Preparing for the installation" on page 627.

20.4.4 Installing the DMM multipath driver

Follow the below steps to install the DMM multipath driver:
Setting HBA timeouts
Modify the /etc/modprobe.conf.local file and add the following lines to this file:
options lpfc_nodev_tmo 10
options qla2xxx qlport_down_retry=10
Setup multipath.conf
It is very important to set up this file as it is consulted by the multipath command for the
configuration of multipath devices. It is essentially the configuration file for devices virtualized
by device mapper.
The file has four sections:
Defaults: Specifies system level default override
Blacklist: Specifies a list of devices to not be multipathed
Devices: Specifies the list of devices that the setting will be applied to
FC HBA
HS21
BladeServer
FC HBA
Chapter 20. SuSE Linux configuration guide
Linux Config.fm
Zone 1
Zone 2
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