Red Hat GNBD WITH GLOBAL FILE SYSTEM IN RHEL 4.5 Przewodnik Instalacji Pobierz pdf (Strona 38)

Chapter 5. DM-Multipath Administration and Troubleshooting

mpath1 (3600d0230003228bc000339414edb8101)

[size=10 GB][features="0"][hwhandler="0"]

\_ round-robin 0 [prio=1][active]

\_ 2:0:0:6 sdb 8:16 [active][ready]

\_ round-robin 0 [prio=1][enabled]

\_ 3:0:0:6 sdc 8:64 [active][ready]

5.7. Multipath Command Options

Table 5.1, “Useful multipath Command Options” describes some options of the multipath

command that you may find useful.

Table 5.1. Useful multipath Command Options

Option Description

-l Display the current multipath configuration gathered from sysfs and

the device mapper.

-ll Display the current multipath configuration gathered from sysfs, the

device mapper, and all other available components on the system.

-f device Remove the named multipath device.

-F Remove all multipath devices.

5.8. Determining Device Mapper Entries with the dmsetup

Command

You can use the dmsetup command to find out which device mapper entries match the multipathed

devices.

The following command displays all the device mapper devices and their major and minor numbers.

The minor numbers determine the name of the dm device. For example, a minor number of 3

corresponds to the multipathed device /dev/dm-3.

# dmsetup ls

mpath2 (253, 4)

mpath4p1 (253, 12)

mpath5p1 (253, 11)

mpath1 (253, 3)

mpath6p1 (253, 14)

mpath7p1 (253, 13)

mpath0 (253, 2)

mpath7 (253, 9)

mpath6 (253, 8)

VolGroup00-LogVol01 (253, 1)

mpath5 (253, 7)

VolGroup00-LogVol00 (253, 0)

mpath4 (253, 6)

mpath1p1 (253, 10)

mpath3 (253, 5)

5.9. Troubleshooting with the multipathd Interactive

Console

The multipathd -k command is an interactive interface to the multipathd daemon. Entering

this command brings up an interactive multipath console. After entering this command, you can enter

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 44

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