Novell LINUX ENTERPRISE SERVER 10 - STORAGE ADMINISTRATION GUIDE 7-2007, Руководство администратора

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46 SLES 10 Storage Administration Guide
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Table 5-2
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) .
Ensure that the multipath-tools package is installed by entering the following at a terminal console
prompt:
rpm -q multipath-tools
5.2.3 Using mdadm for Multipathed Devices
The default settings for
mdadm.conf
(and
lvm.conf
) do not work properly with multipathed
devices. By default, both
md
and LVM2 scan physical devices only and ignore any symbolic links or
device-mapper devices.
Scanning physical devices does not work for multipathed devices. Instead you must scan for
multipathed devices in the
/dev/disk/by-id
directory.
If a previous MD installation exists, modify
mdadm.conf
to handle the devices correctly by ID
instead of by device node path. For instructions, see Section 5.4.4, “Configuring mdadm.conf and
lvm.conf to Scan Devices by UUID,” on page 48 .
To use software RAID with
mdadm
, the
/etc/mdadm.conf
must be set up correctly. See “Using
Multipathed Devices” on page 53 for more information.
5.3 Supported Storage Subsystems
Multipath I/O is available on all of the processor platforms that are supported by SUSE Linux
Enterprise Server. The following storage subsystems have been tested with SUSE Linux Enterprise
Server:
EMC*
Hitachi*
Hewlett-Packard*/Compaq*
IBM*
NetApp*
SGI*
Most other vendors’ storage subsystems should also work. Consult your vendor’s documentation for
guidance.
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.