Novell LINUX ENTERPRISE SERVER 11 - STORAGE ADMINISTRATION GUIDE 2-23-2010 Administration Manual page 58

Configuring User-Friendly Names or Alias Names in /etc/multipath.conf
A multipath device can be identified by either its WWID or an alias that you assign for it. The
WWID (Worldwide Identifier) is an identifier for the multipath device that is guaranteed to be
globally unique and unchanging. The default name used in multipathing is the ID of the logical unit
as found in the
and
/dev/dm-n
The multipath device names in the
always consistent because they use the
association. These device names are user-friendly names such as
.
mpath-.*
You can specify your own device names to use via the ALIAS directive in the
multipath.conf
mpath-.*
IMPORTANT: We recommend that you do not use aliases for the root device, because the ability to
seamlessly switch off multipathing via the kernel command line is lost because the device name
differs.
For an example of
tools/multipath.conf.synthetic
1 In a terminal console, log in as the
2 Open the
3 Uncomment the
4 Uncomment the
For example:
## Use user friendly names, instead of using WWIDs as names.
defaults {
user_friendly_names yes
}
5 Optionally specify your own user-friendly names for devices using the
multipath
For example:
multipath {
wwid 26353900f02796769
alias sdd4l0
}
6 Save your changes, then close the file.
Blacklisting Non-Multipathed Devices in /etc/multipath.conf
The
/etc/multipath.conf
devices are listed. For example, local IDE hard drives and floppy drives are not normally
multipathed. If you have single-path devices that
multipath
58 SLES 11: Storage Administration Guide
directory. Because device node names in the form of
/dev/disk/by-id
can change on reboot, referring to multipath devices by their ID is preferred.
/dev/mapper
file. Alias names override the use of ID and
names.
multipath.conf
/etc/multipath.conf
directive and its ending bracket.
Defaults
user_friendly_names option
section.
file should contain a
to ignore them, put them in the
directory reference the ID of the LUN and are
/var/lib/multipath/bindings
settings, see the
/usr/share/doc/packages/multipath-
file.
user.
root
file in a text editor.
, then change its value from No to Yes.
blacklist
is trying to manage and you want
multipath
section to resolve the problem.
blacklist
file to track the
/dev/disk/by-id/dm-uuid-.*-
/etc/
/dev/disk/by-id/dm-uuid-.*-
directive in the
alias
section where all non-multipathed
/dev/sdn