Multipath Queries With Multipath Command; Multipath Command Options - Red Hat DEVICE-MAPPER MULTIPATH 4.6 Configuration And Administration Manual

Chapter 5. DM-Multipath Administration and Troubleshooting
\_ 2:0:0:6 sdb 8:16 [active][ready]
\_ round-robin 0 [prio=1][enabled]
\_ 3:0:0:6 sdc 8:64 [active][ready]
If the path is up and ready for I/O, the status of the path is
the status is or
faulty
daemon based on the polling interval defined in the
The dm status is similar to the path status, but from the kernel's point of view. The dm status
has two states:
failed
states. Occasionally, the path state and the dm state of a device will temporarily not agree.
Note
When a multipath device is being created or modified, the path group status and
the dm status are not known. Also, the features are not always correct. When a
multipath device is being listed, the path group priority is not known.

2. Multipath Queries with multipath Command

You can use the and
-l
configuration. The option displays multipath topology gathered from information in
-l
the device mapper. The
other available components of the system.
When displaying the multipath configuration, there are three verbosity levels you can specify
with the option of the
-v
outputs the created or updated multipath names only, which you can then feed to other tools
such as . Specifying
kpartx
The following example shows the output of a
# multipath -1
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]

3. Multipath Command Options

Table 5.1, "Useful
multipath
command that you may find useful.
28
. The path status is updated periodically by the
failed
, which is analogous to
options of the
-ll multipath
option displays the information the
-ll
command. Specifying
multipath
prints all detected paths, multipaths, and device maps.
-v2
Command Options"
or
ready
/etc/multipath.conf
, and
faulty active
command to display the current multipath
displays in addition to all
-l
yields no output. Specifying
-v0
command.
multipath -l
describes some options of the
. If the path is down,
active
multipathd
file.
which covers all other path
sysfs
multipath
and
-v1