Red Hat DEVICE-MAPPER MULTIPATH 5.2 Manual do Utilizador descarregar pdf (Página 28)

5.2.1.4 Rebooting the Linux Server

Reboot the Linux server.

# shutdown -r now

After rebooting, the following warning message may appear in the "/var/log/message". However, there is no

actual problem with multipath configuration and operation.

Jun 30 16:15:00 nvcs2 multipathd: sdb: Using deprecated prio_callout '/sbin/mpath_prio_alua %d'

(controller setting) Please fixup /etc/multipath.conf

5.2.2 Checking the device-mapper multipath

After they have been enabled, confirm the device-mapper multipath settings.

5.2.2.1 Recognizing the Post device-mapper multipath LUNs

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

Example:

# cd /dev/mapper

# ls -l

total 0

lrwxrwxrwx 1 root root 16 Apr 2 00:44 control -> ../device-mapper

brw------- 1 root root 253, 0 Apr 2 00:44 mpatha

brw------- 1 root root 253, 1 Apr 2 00:44 mpathb

brw------- 1 root root 253, 2 Apr 2 00:44 mpathc

brw------- 1 root root 253, 3 Apr 2 00:44 mpathd

brw------- 1 root root 253, 23 Apr 2 00:44 mpathu

brw------- 1 root root 253, 24 Apr 2 00:44 mpathv

brw------- 1 root root 253, 25 Apr 2 00:44 mpathw

brw------- 1 root root 253, 26 Apr 2 00:44 mpathx

5.2.2.2 Checking the device-mapper multipath Status and Created Devices

Check the path status using the "multipath -ll" command. Check that the recognized status of the devices for

all the paths that are assigned to the server is normal.

•

Multipath is in normal status (This example shows when two paths are used to connect to the ETERNUS

DX410)

Check that multipathing is configured in the two block devices and "active ready" is displayed for each path

status.

# multipath -ll

mpathr (3600000e00d00000000000422001e0000) dm-20 FUJITSU,ETERNUS_DX400

[size=2.0G][features=1 queue_if_no_path][hwhandler=0]

\_ round-robin 0 [prio=100][active]

\_ 6:0:0:6 sdaf 65:240 [active][ready]

\_ 5:0:0:6 sdh 8:112 [active][ready]

When the path status is normal,

"[active][ready]" is displayed.

Two block device names are

displayed for a two-path configuration.

Chapter 5 For SUSE Linux Enterprise Server 10

5.2 For SUSE Linux Enterprise Server 10 SP2 or Earlier

FUJITSU Storage ETERNUS DX Configuration Guide -Server Connection-

(Fibre Channel/FCoE/iSCSI/SAS) for Linux

P3AM-3912-21ENZ0

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