You can enable the system to support multipathing for Linux
hosts.
The system supports the Linux device-mapper multipathing
driver for the iSCSI host attachment. After the iSCSI devices
are discovered, you can enable multipathing.
To enable multipathing for a Linux host, complete the
following steps:
- If the daemon is already running, stop the multipathing
daemon with the service multipathd stop command.
- Add the entry for the system by editing the multipath
configuration file, /etc/multipath.conf. In the DMMP configuration file, /etc/multipath.conf, ensure that the default settings include the values that are described
in Settings for Linux hosts
Note: Prevent blacklisting of the IBM 2145 devices
by either disabling blacklisting of devices entirely or by adding
an appropriate entry in the blacklist_exceptions section.
- Save the file.
- Restart the multipathing daemon with the service
multipathd start command.
If you are using SUSE Linux Enterprise Server 10 Service
Pack 2 or later, replace the line prio "/sbin/mpath_prio/alua
/dev/%n" with prio "alua" to disable the Using deprecated prio message.
Note: Linux™ usually enables multipathing automatically. However, in some
cases such as the RH 6.3 SAN boot installation, the multipathing is
not configured properly. If this situation occurs, you must manually
edit the
/etc/multipath.conf file. For more information
about DM-multipath, see the Linux™
Storage
Administration Guide or
DM-Multipathing Installation
and Configuration Guide for your kernel from the Linux™ provider. For more information about Linux™ system configuration, see the following website:
http://www.ibm.com/support/knowledgecenter/linuxonibm/liaab/ic-homepage.htm