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10.2 System Configuration
The system must be manually configured to automatically load the device drivers for
the controllers to which the multipath IO devices are connected within the INITRD.
Therefore add the needed driver module to the variable INITRD_MODULES in the
file /etc/sysconfig/kernel.
If your system, for example, contains a RAID controller accessed by the cciss driver
and multipath IO devices connected to a Qlogic controller accessed by the driver
qla2xxx, this entry would look like:
INITRD_MODULES="cciss"
Because the Qlogic driver is not automatically loaded on start-up, add it here:
INITRD_MODULES="cciss qla2xxx"
After having changed /etc/sysconfig/kernel, recreate the INITRD on your
system with the command mkinitrd.
When you are using LILO as a boot manager, reinstall it with the command
/sbin/lilo. No further action is required if you are using GRUB.
10.3 Software Configuration
10.3.1 Configuring multipath-tools
If you are using a storage subsystem that is automatically detected (see
Section 10.1,
"Supported Hardware"
(page 252)), no further configuration of the multipath-tools
is required. Otherwise create /etc/multipath.conf and add an appropriate device
entry for your storage subsystem. See /usr/share/doc/packages/
multipath-tools/multipath.conf.annotated for a template with extensive
comments.
After having set up the configuration, you can perform a "dry-run" with multipath
-v2 -d, which only scans the devices and prints what the setup would look like. The
output is similar to the following:
Multipath IO
253
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Troubleshooting
