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Chapter 9 Setting Up and Checking the device-mapper multipath

9.4 Recognizing the Post device-mapper multipath LUNs

9.4

Recognizing the Post device-mapper multipath LUNs

Check the device file created by the device-mapper multipath.

Also check that the device file is linked to the "/dev/dm-X" file.

Execution example

#cd /dev/disk/by-name/

#ls -l

lrwxrwxrwx 1 root root 10 Aug 25 13:40 mpatha -> ../../dm-0

lrwxrwxrwx 1 root root 10 Aug 25 13:40 mpathb -> ../../dm-1

lrwxrwxrwx 1 root root 10 Aug 25 13:39 mpathc -> ../../dm-2

lrwxrwxrwx 1 root root 10 Aug 25 13:39 mpathd -> ../../dm-3

lrwxrwxrwx 1 root root 10 Aug 25 13:40 mpathe -> ../../dm-4

lrwxrwxrwx 1 root root 10 Aug 25 13:39 mpathf -> ../../dm-5

lrwxrwxrwx 1 root root 10 Aug 25 13:39 mpathg -> ../../dm-6

9.5

Checking the device-mapper multipath Status

Check the path status using the "multipath -ll" command.

•

When both paths are in normal status (This example is for the ETERNUS2000)

The multipath consists of the block device names

"sde" and "sdc". "mpathc" is created.

# multipath -ll

mpathc (3600000e00d00000000000f7e00010000) dm-2 FUJITSU,E2000

size=10G features='1 queue_if_no_path' hwhandler='0' wp=rw

|-+- policy='round-robin 0' prio=150 status=active

| '- 4:0:0:1 sde 8:64 active ready running

'-+- policy='round-robin 0' prio=10 status=enabled

For SLES10, the following message may appear in the path status after executing the "multipath

-ll" command. However, there is no actual problem with multipath configuration and operation.

sde: Using deprecated prio_callout '/sbin/mpath_prio_alua %d' (controller setting)

sdc: Using deprecated prio_callout '/sbin/mpath_prio_alua %d' (controller setting)

P3AM-4152-02ENZ0

ETERNUS Disk storage systems Server Connection Guide (iSCSI) for Linux

(SUSE Linux Enterprise Server)

'- 3:0:0:1 sdc 8:32 active ready running

Two block device names are displayed

for a two-path configuration.

Please fixup /etc/multipath.conf

E2000 is displayed since the

ETERNUS2000 is connected.

When the path status is normal,

"active ready" is displayed.