Using Mdadm For Multipathed Devices - Novell LINUX ENTERPRISE SERVER 11 - STORAGE ADMINISTRATION GUIDE 2-23-2010 Administration Manual

Tools in the multipath-tools Package
Table 7-2
Tool
multipath
multipathd
devmap-name
kpartx
For a list of files included in this package, see the
www.novell.com/products/linuxpackages/suselinux/multipath-tools.html).
1 Ensure that the
console prompt:
rpm -q multipath-tools
If it is installed, the response repeats the package name and provides the version information,
such as:
multipath-tools-04.7-34.23
If it is not installed, the response reads:
package multipath-tools is not installed

7.3.3 Using mdadm for Multipathed Devices

Udev is the default device handler, and devices are automatically known to the system by the
Worldwide ID instead of by the device node name. This resolves problems in previous releases
where
mdadm.conf
Just as for LVM2,
node path. Therefore, the
DEVICE /dev/disk/by-id/*
If you are using user-friendly names, specify the path as follows so that only the device mapper
names are scanned after multipathing is configured:
DEVICE /dev/disk/by-id/dm-uuid-.*-mpath-.*
To verify that
1 Ensure that the
prompt:
rpm -q mdadm
If it is installed, the response repeats the package name and provides the version information.
For example:
mdadm-2.6-0.11
If it is not installed, the response reads:
package mdadm is not installed
52 SLES 11: Storage Administration Guide
Description
Scans the system for multipathed devices and assembles them.
Waits for maps events, then executes
Provides a meaningful device name to
Maps linear devmaps to partitions on the multipathed device, which makes
it possible to create multipath monitoring for partitions on the device.
multipath-tools
and did not properly recognize multipathed devices.
lvm.conf
requires that the devices be accessed by the ID rather than by the device
mdadm
entry in
DEVICE
is installed:
mdadm
package is installed by entering the following at a terminal console
mdadm
multipath
multipath-tools Package Description (http://
package is installed by entering the following at a terminal
should be set as follows:
/etc/mdadm.conf
.
udev for device maps (devmaps).