Novell LINUX ENTERPRISE SERVER 11 - STORAGE ADMINISTRATION GUIDE 2-23-2010, Administration Manual, Page: 74 / 140

74 SLES 11: Storage Administration Guide
no
vd
ocx
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n)
7 Ja
nua
ry 201
0
mke2fs -j /dev/dm-9
tune2fs -L
oradata3 /dev/dm-9
9 Restart DM-MP to let it read the aliases by entering
/etc/init.d/multipathd restart
10
Verify that the device is recognized by
multipathd
by entering
multipath -ll
11 Use a text editor to add a mount entry in the
/etc/fstab
file.
At this point, the alias you created in Step 5 is not yet in the
/dev/disk/by-label
directory.
Add the mount entry the
/dev/dm-9
path, then change the entry before the next time you
reboot to
LABEL=oradata3
12 Create a directory to use as the mount point, then mount the device by entering
md /oradata3
mount /oradata3
7.12 Viewing Multipath I/O Status
Querying the multipath I/O status outputs the current status of the multipath maps.
The
multipath -l
option displays the current path status as of the last time that the path checker
was run. It does not run the path checker.
The
multipath -ll
option runs the path checker, updates the path information, then displays the
current status information. This option always the displays the latest information about the path
status.
1 At a terminal console prompt, enter
multipath -ll
This displays information for each multipathed device. For example:
3600601607cf30e00184589a37a31d911
[size=127 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [active][first]
\_ 1:0:1:2 sdav 66:240 [ready ][active]
\_ 0:0:1:2 sdr 65:16 [ready ][active]
\_ round-robin 0 [enabled]
\_ 1:0:0:2 sdag 66:0 [ready ][active]
\_ 0:0:0:2 sdc 8:32 [ready ][active]
For each device, it shows the device’s ID, size, features, and hardware handlers.
Paths to the device are automatically grouped into priority groups on device discovery. Only one
priority group is active at a time. For an active/active configuration, all paths are in the same group.
For an active/passive configuration, the passive paths are placed in separate priority groups.
The following information is displayed for each group:
Š
Scheduling policy used to balance I/O within the group, such as round-robin
Š Whether the group is active, disabled, or enabled