Red Hat DEVICE-MAPPER MULTIPATH 5.2 Manual de usuario descargar pdf (Pagina 11)

2.2 Checking the device-mapper multipath

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

2.2.1 Recognizing the Post device-mapper multipath LUNs

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

Example:

# ls -l /dev/mapper/

total 0

crw-rw----. 1 root root 10, 58 Apr 14 09:01 control

lrwxrwxrwx. 1 root root 7 Apr 14 09:01 mpathh -> ../dm-1

lrwxrwxrwx. 1 root root 7 Apr 14 09:01 mpathi -> ../dm-0

lrwxrwxrwx. 1 root root 7 Apr 14 09:01 mpathj -> ../dm-5

lrwxrwxrwx. 1 root root 7 Apr 14 09:01 mpathk -> ../dm-6

lrwxrwxrwx. 1 root root 7 Apr 14 09:01 mpathl -> ../dm-3

lrwxrwxrwx. 1 root root 7 Apr 14 09:01 mpathm -> ../dm-2

lrwxrwxrwx. 1 root root 7 Apr 14 09:01 mpathn -> ../dm-4

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

DX80)

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

status.

# multipath -ll

mpathh (3600000e00d0000000001000000200000) dm-1 FUJITSU,ETERNUS_DXL

size=2.0G features=’1 queue_if_no_path’ hwhandler=’0’ wp=rw

|-+- policy=’round-robin 0’ prio=50 status=active

| ‘- 1:0:0:0 sdb 8:16 active ready running

‘-+- policy=’round-robin 0’ prio=10 status=enabled

‘- 2:0:0:0 sdi 8:128 active ready running

When the path status is

normal, "active ready" is displayed.

Two block device names are

displayed for a two-path configuration.

Chapter 2 For Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 6, or Oracle Linux

2.2 Checking the device-mapper multipath

FUJITSU Storage ETERNUS DX Configuration Guide -Server Connection-

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

P3AM-3912-21ENZ0

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Red Hat DEVICE-MAPPER MULTIPATH 5.2 Manual de usuario Pagina 11