Novell LINUX ENTERPRISE SERVER 10 - INSTALLATION AND ADMINISTRATION 04-08-2006 Installation Manual page 254

3600601607cf30e00184589a37a31d911
[size=127 GB]
emc"]
\_ round-robin 0 [first]
\_ 1:0:1:2 sdav 66:240
\_ 0:0:1:2 sdr
\_ round-robin 0
\_ 1:0:0:2 sdag 66:0
\_ 0:0:0:2 sdc
Name of the device
Size of the device
Features of the device
Hardware handlers involved
Priority group 1
Priority group 2
Paths are grouped into priority groups. There is only ever one priority group in active
use. To model an active/active configuration, all paths end up in the same group. To
model active/passive, the paths that should not be active in parallel are placed in several
distinct priority groups. This normally happens completely automatically on device
discovery.
The output shows the order, the scheduling policy used to balance IO within the group,
and the paths for each priority group. For each path, its physical address (host:bus:tar-
get:lun), device node name, major:minor number, and state is shown.
10.3.2 Enabling the Components
To start the multipath IO services, run the following commands:
/etc/init.d/boot.multipath start
/etc/init.d/multipathd start
The multipath devices should now show up automatically under /dev/disk/
by-name/. The default name is the WWN (World Wide Name) of the logical unit,
which you can override using /var/lib/multipath/bindings by setting
user_friendly_names in /etc/multipath.conf to yes.
254 Installation and Administration
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