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Features of Storage Arrays
Boot/Root device support
Device Mapper Multipath detects every path for a multipathed device as a separate SCSI device.
The SCSI device names take the form
beginning with a and issued sequentially as the devices are created, such as
and so on. If the number of devices exceeds 26, the letters are duplicated so that the next device after
will be named
/dev/sdz
If multiple paths are not automatically detected, you can configure them manually in the
file. The
multipath.conf
For information, see
Section 5.4.5, "Creating and Configuring the /etc/multipath.conf File," on
page
56.
5.3.2 Multipath I/O Management Tools
The
user-space package takes care of automatic path discovery and grouping. It
multipath-tools
automatically tests the path periodically, so that a previously failed path is automatically reinstated
when it becomes healthy again. This minimizes the need for administrator attention in a production
environment.
Tools in the multipath-tools Package
Table 5-2
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
multipath-tools
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
Description
Multipathing is supported for the root (
Server 10 and later. The host server must be connected to the currently
active controller and storage processor for the boot device. The
partition must be on a separate, non-multipathed partition. Otherwise, no
boot loader is written. For information, see
Multipath I/O for the Root Device," on page
, where
/dev/sdN
,
, and so on.
/dev/sdaa
/dev/sdab
file does not exist until you create and configure it.
multipath.conf
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 Package Description (http://
package is installed by entering the following at a terminal
) device in SUSE Linux Enterprise
/
Section 5.8, "Configuring
67.
is an autogenerated letter for the device,
N
/dev/sda
multipath
.
for device maps (devmaps).
udev
Managing Multipath I/O for Devices
/boot
,
,
/dev/sdb
/etc/
51
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Table of Contents
Troubleshooting
