Viewing Multipath I/O Status - Novell LINUX ENTERPRISE SERVER 11 - STORAGE ADMINISTRATION GUIDE 2-23-2010 Administration Manual

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
multipath -ll
11 Use a text editor to add a mount entry in the
At this point, the alias you created in
Add the mount entry the
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
was run. It does not run the path checker.
The
multipath -ll
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
\_ 0:0:1:2 sdr
\_ round-robin 0 [enabled]
\_ 1:0:0:2 sdag 66:0
\_ 0:0:0:2 sdc
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:
Scheduling policy used to balance I/O within the group, such as round-robin
Whether the group is active, disabled, or enabled
74 SLES 11: Storage Administration Guide
multipathd
Step 5
path, then change the entry before the next time you
/dev/dm-9
option displays the current path status as of the last time that the path checker
option runs the path checker, updates the path information, then displays the
[ready ][active]
65:16 [ready ][active]
[ready ][active]
8:32 [ready ][active]
by entering
file.
/etc/fstab
is not yet in the
/dev/disk/by-label
directory.