Multipath configuration can be verified with
the information in
/etc/multipath.conf file by utilizing following
commands.
multipath -v2 –d
multipath -v3 –d
Once the above commands are verified to be successful,
the multipath devices are available at
/dev/mapper/mpathX by
default where X is multipath eligible devices. You can use
multipath-ll to verify the status
of the multipath configuration. The output should be similar to the
details shown below:
linux-ha-2:~ #multipath –ll
mpathc (3690b11c025a5ef001b289a2f60d160b6) dm-1 DELL,
Shared PERC8
size=50G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| `- 1:2:1:0 sdc 8:32 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 2:2:1:0 sde 8:64 active ready running
mpathb (3690b11c025a5ef001b2895c11d374ab5) dm-0 DELL,
Shared PERC8
size=10G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50
status=active
| `- 1:2:0:0 sdb 8:16 active ready
running
`-+- policy='round-robin 0' prio=10 status=enabled
`- 2:2:0:0 sdd 8:48 active ready running
In the above output, the
status field shows
us whether a path is
active or
enabled. The
active path services the IO. Priority field is also used with status field
to identify the path to be used with highest priority. Also each path
has a unique access identifier to the shared VD (For
mpathc it is
/dev/sdc and
/dev/sde)
