Using Mdadm For Multipathed Devices; The Linux Multipath(8) Command - Novell LINUX ENTERPRISE SERVER 10 SP3 - STORAGE ADMINISTRATION GUIDE 2-23-2010 Administration Manual

5.3.3 Using mdadm for Multipathed Devices

In SUSE Linux Enterprise Server 10, 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
recognize multipathed devices.
Just as for LVM2,
node path. Therefore, the
DEVICE /dev/disk/by-id/*
This is the default handling in SUSE Linux Enterprise Server 10 and later, as noted above.
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
For information about modifying the
Multipath Devices," on page

5.3.4 The Linux multipath(8) Command

Use the Linux
General syntax for the
multipath [-v verbosity] [-d] [-h|-l|-ll|-f|-F] [-p failover | multibus |
group_by_serial | group_by_prio| group_by_node_name ]
General Examples
Configure multipath devices:
multipath
Configure a specific multipath device:
multipath devicename
Replace devicename with the device node name such as
$DEVNAME variable), or in the major:minor format.
Selectively suppress a multipath map, and its device-mapped partitions:
multipath -f
52 SLES 10 SP3: Storage Administration Guide
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
/etc/lvm/lvm.conf
46.
command to configure and manage multipathed devices.
multipath(8)
command:
multipath(8)
and
mdadm.conf lvm.conf
should be set as follows:
/etc/mdadm.conf
file, see
/dev/sdb
did not properly
Section 5.2.3, "Using LVM2 on
(as shown by udev in the