Chapter 12. Host configuration 567
Hosts that use 2.6 kernel Linux operating systems can have as many FC disks as the SVC
allows. The following website provides the most current information about the maximum
configuration for the SVC:
http://www.ibm.com/storage/support/2145
12.6.5 Creating and preparing DM-MPIO volumes for use
First, you have to start the MPIO daemon on your system. Run either the following SLES10
command or the following RHEL5 command on your host system:
Enable MPIO for SLES10 by running the following commands:
/etc/init.d/boot.multipath {start|stop}
/etc/init.d/multipathd
{start|stop|status|try-restart|restart|force-reload|reload|probe}
Enable MPIO for RHEL5 by running the following commands:
modprobe dm-multipath
modprobe dm-round-robin
service multipathd start
chkconfig multipathd on
Example 12-28 shows the commands that are issued on a Red Hat Enterprise Linux 5.1
operating system.
Example 12-28 Starting MPIO daemon on Red Hat Enterprise Linux
[root@palau ~]# modprobe dm-round-robin
[root@palau ~]# multipathd start
[root@palau ~]# chkconfig multipathd on
[root@palau ~]#
Follow these steps to enable multipathing for IBM devices:
1. Open the multipath.conf file and follow the instructions. The file is located in the /etc
directory. Example 12-29 shows editing using vi.
Example 12-29 Editing the multipath.conf file
[root@palau etc]# vi multipath.conf
2. Add the following entry to the multipath.conf file:
device {
vendor "IBM"
product "2145"
path_grouping_policy group_by_prio
prio_callout "/sbin/mpath_prio_alua /dev/%n"
}
Tip: Run insserv boot.multipath multipathd to automatically load the multipath
driver and multipathd daemon during start-up.
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