Novell LINUX ENTERPRISE SERVER 11 - STORAGE ADMINISTRATION GUIDE 2-23-2010, Руководство администратора, Страница: 52 / 140

52 SLES 11: Storage Administration Guide
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Table 7-2
Tools in the multipath-tools Package
For a list of files included in this package, see the multipath-tools Package Description (http://
www.novell.com/products/linuxpackages/suselinux/multipath-tools.html) .
1 Ensure that the
multipath-tools
package is installed by entering the following at a terminal
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
and
lvm.conf
did not properly recognize multipathed devices.
Just as for LVM2,
mdadm
requires that the devices be accessed by the ID rather than by the device
node path. Therefore, the
DEVICE
entry in
/etc/mdadm.conf
should be set as follows:
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
mdadm
is installed:
1 Ensure that the
mdadm
package is installed by entering the following at a terminal console
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
Tool Description
multipath Scans the system for multipathed devices and assembles them.
multipathd Waits for maps events, then executes multipath .
devmap-name Provides a meaningful device name to udev for device maps (devmaps).
kpartx Maps linear devmaps to partitions on the multipathed device, which makes
it possible to create multipath monitoring for partitions on the device.